1	"Plants with a bicoloured calyx indumentum, condensed inflorescences and predominantly orange or yellow flowers"	2
1	"Plants with or without a bicoloured calyx indumentum; inflorescence shape and flower colour various"	17
2	"Lower leaf surface glabrous or early-glabrescent"	3
2	"Lower leaf surface sericeous or occasionally partially glabrescent in older leaves"	12
3	"Leaves broadly ovate or depressed-ovate, about as wide or wider than long, subsessile, the base deeply cordate, concealing the stem about the nodes, apical mucro sharply pungent"	"Gastrolobium ferrugineum"
3	"Leaves variously shaped but not broadly ovate or depressed-ovate, always obviously longer than wide, clearly petiolate, the base various, but if cordate, never concealing the stem, apical mucro, if present, usually innocuous (sub-pungent in G. rhombifolium)"	4
4	"Ovules 2"	5
4	"Ovules 4"	7
5	"Leaf base smoothly attenuate; margins usually prominently undulate"	"Gastrolobium crispatum"
5	"Leaf base rounded; margins rarely undulate"	6
6	"Leaves mostly ovate, less often elliptic; branchlet and peduncle indumentum dense, tangled, hairs ferruginous on the peduncle"	"Gastrolobium pyramidale"
6	"Leaves mostly obovate, less often elliptic; branchlet and peduncle indumentum ± straight, variously antrorse, hairs silvery throughout"	"Gastrolobium crenulatum"
7	"Leaf apex trilobed, usually with each of the lobes stiffly mucronate, the lateral lobes on some leaves occasionally without mucros"	"Gastrolobium rhombifolium"
7	"Leaf apex entire, emarginate or variously lobed but if trilobed then the two lateral lobes never mucronate"	8
8	"Most, or at least some leaves, ovate or narrowly so, the remainder elliptic or occasionally obovate; apex entire, obtuse; base cuneate, rounded or occasionally cordate"	"Gastrolobium whicherense"
8	"Leaves variously obovate or narrowly elliptic to ± oblong; apex emarginate or variously lobed, or if entire, then either truncate, obtuse or acuminate; base smoothly attenuate, cuneate or rounded"	9
9	"Longest leaves 30–60 mm long, widest leaves 10–30 mm wide; leaves variously obovate, usually with undulate margins in upper half; apex very variable, truncate, obtuse, acuminate, emarginate, bilobed or trilobed; base usually smoothly attenuate, occasionally cuneate"	10
9	"Longest leaves 10–25(–30) mm long, widest leaves 4–12 mm wide; leaves narrowly obovate or oblong to narrowly elliptic, without undulate margins; apex usually emarginate or obtuse, less often markedly bilobed; base cuneate or rounded"	11
10	"Leaves glaucous; apex trilobed; leaves mostly opposite at upper nodes"	"Gastrolobium rhombifolium (eastern variant)"
10	"Leaves not glaucous; apex various, as for couplet 7 above, including trilobed; all leaves in whorls of 3 or 4"	"Gastrolobium dilatatum"
11	"All leaves in whorls of 3"	"Gastrolobium retusum"
11	"Leaves frequently opposite at upper nodes"	"Gastrolobium retusum (northern variant)"
12	"Leaves opposite at upper nodes, narrowly ovate, narrowly elliptic to oblong"	"Gastrolobium elegans"
12	"Leaves in whorls of 3, variously shaped but usually broader than above"	13
13	"Leaves ovate or elliptic, sometimes narrowly so, rarely a few leaves obovate, if narrowly elliptic then the margins strongly recurved"	14
13	"Leaves variously obovate or if occasionally narrowly elliptic then folded lengthways (i.e. V-shaped in section)"	15
14	"Lower leaf surface at least partially glabrescent on older leaves"	"Gastrolobium whicherense"
14	"Lower leaf surface with persistent indumentum on older leaves"	"Gastrolobium coriaceum"
15	"Branch indumentum spreading"	"Gastrolobium dilatatum (Wandoo variant)"
15	"Branchlet indumentum appressed"	16
16	"Young leaves densely pubescent on lower surface only; upper surface of mature leaves with prominent, raised venation, markedly papillose (especially on the veins)"	"Gastrolobium argyrotrichum"
16	"Young leaves pubescent on both surfaces; upper surface of mature leaves with indistinct, barely raised venation, not or minutely papillose (only observable under high magnification)"	"Gastrolobium dorrienii"
17	"Standard petal reduced to less than 1/3 the length of the keel petal"	18
17	"Standard petal at least as long or longer than the keel petal, or rarely slightly shorter"	29
18	"Flowers sessile in a 4-flowered head sheathed by an involucre of large bracts; petals obscured by the lower calyx lobes"	"Gastrolobium formosum"
18	"Flowers in racemes, umbels or solitary, pedicellate; petals not obscured by the calyx lobes"	19
19	"Leaves strictly opposite and decussate"	20
19	"Leaves all alternate, or some opposite and some alternate"	23
20	"Leaf base always cordate; keel petal <14 mm long; petals burgundy"	"Gastrolobium subcordatum"
20	"Leaf base not or slightly cordate; keel petal >18 mm long; petals red or pale greenish"	21
21	"Leaves ovate to linear; lower three calyx lobes ± equal to the tube"	"Gastrolobium celsianum"
21	"Leaves obcordate, obtriangular, obovate or obcrescentic; lower three calyx lobes 2–4 times longer than the tube"	22
22	"Leaves obcordate, obtriangular or obovate, herbaceous, not pungent-pointed; flowers resupinate or erect; keel petal c. 30 mm long"	"Gastrolobium praemorsum"
22	"Leaves consistently obcrescentic, coriaceous, semi-pungent with mucro; flowers pendulous; keel petal c. 20 mm long"	"Gastrolobium papilio"
23	"Leaves linear-elliptic, except at base of stem; bracts 5–7 mm long, with 2 round lobes, cupped around calyx base"	"Gastrolobium bracteolosum"
23	"Leaves almost always broader than linear; bracts <1 mm long, trifid or leaf-like"	24
24	"Flowers pendulous; calyx base inflated; standard lamina much narrower than the auricular base, apex acute, entire"	25
24	"Flowers not pendulous; calyx base not inflated; standard lamina broader than the auricular base or slightly tapered, apex emarginate"	26
25	"Leaves all alternate, not narrow (length:breadth <2:1), mostly elliptic to orbicular; flowers pale yellow-green"	"Gastrolobium sericeum"
25	"At least some leaves opposite, narrow (length:breadth >3:1), ovate to oblong; flowers purple-black"	"Gastrolobium melanopetalum"
26	"At least some leaves opposite; stems procumbent or ascending up to 1 m or more; wings half the length of the keel"	"Gastrolobium sericeum"
26	"Leaves all alternate; stems prostrate or <0.5 m high; wings ± equal to the keel"	27
27	"Keel petal >35 mm long; calyx lobes long-acute; margins of standard incurved at apex; stipules ± terete, entire"	"Gastrolobium latifolium"
27	"Keel petal <25 mm long; calyx lobes subobtuse; margins of standard petal recurved at apex; stipules ± angular, minutely denticulate"	28
28	"Prostrate, not stoloniferous; inflorescences 1-flowered, axillary; petals bright red with a yellow marking on the standard"	"Gastrolobium minus"
28	"Prostrate, stoloniferous and with aerial stems; inflorescences paniculate, borne on the stolons, with only the flowers visible above the litter; petals pale green with pink infusion"	"Gastrolobium modestum"
29	"Leaves in whorls of 3 or more, or crowded along the stem such that it is difficult to distinguish phyllotaxis"	30
29	"Leaves opposite, alternate or scattered along the stem, not crowded along the stem"	70
30	"Inflorescence strictly axillary"	31
30	"Inflorescences terminal, or with both terminal and axillary inflorescences present"	48
31	"Flowers solitary or in pairs in the axils"	32
31	"Flowers aggregated into condensed racemes or umbels"	36
32	"Stipules entirely absent"	33
32	"Stipules present (may be minute)"	35
33	"Leaves patent to retrorse"	"Gastrolobium epacridoides"
33	"Leaves erect and appressed to the branchlet"	34
34	"Leaves ovate, 8–10 mm long; petioles present (c. 1 mm long)"	"Gastrolobium punctatum"
34	"Leaves elliptic, 4–6(–8) mm long; petioles absent"	"Gastrolobium reticulatum"
35	"Leaves unarmed"	"Gastrolobium linearifolium"
35	"Leaves pungent-pointed"	"Gastrolobium acutum"
36	"Leaves pungent-pointed"	37
36	"Leaves unarmed (may be mucronate, but not pungent)"	42
37	"Leaves with 3 or more pungent points (at least some leaves per specimen)"	38
37	"Leaves with 1 pungent point"	39
38	"Leaf margins recurved; lamina tending to undulate between depressed main veins"	"Gastrolobium ilicifolium"
38	"Leaf margins not recurved; lamina somewhat folded up lengthwise but otherwise flat"	"Gastrolobium tricuspidatum"
39	"Inflorescence rachis elongate (30–160 mm long)"	"Gastrolobium propinquum"
39	"Inflorescence rachis not elongate (0–18 mm long)"	40
40	"Leaves crowded along stem, linear, 1–3 mm broad"	"Gastrolobium stipulare"
40	"Leaves not crowded, oblong, cuneate, rhombic or strongly obovate, 4–24 mm broad"	41
41	"Young branchlets angular; leaf apex acute; stipules 3–5 mm long"	"Gastrolobium obovatum"
41	"Young branchlets terete; leaf apex rounded, obtuse or truncate; stipules <1.5 mm long"	"Gastrolobium brownii"
42	"Flowers large (calyx >8 mm long); petals red"	"Gastrolobium rubrum"
42	"Flowers smaller (calyx <8 mm long); petals yellow to orange with red markings"	43
43	"Leaf margins longitudinally folded up (plicate)"	44
43	"Leaf margins flat, incurved or recurved but not longitudinally folded up"	46
44	"Leaves straight"	"Gastrolobium linearifolium"
44	"Leaves recurved"	45
45	"Leaves generally opposite (rarely whorled or alternate), obtrullate or rhombic; standard 8–11 × 8–12 mm"	"Gastrolobium obovatum"
45	"Leaves in whorls of 3, spathulate; standard 7.5–10 × 7–7.5 mm"	"Gastrolobium spathulatum"
46	"Venation on lower leaf surface very thick, with areoles reduced to pin-pricks; flowers mostly in summer"	"Gastrolobium effusum"
46	"Venation on lower leaf surface openly reticulate; flowers in spring"	47
47	"Mature leaves sericeous beneath"	"Gastrolobium lehmannii"
47	"Mature leaves glabrate"	"Gastrolobium pulchellum"
48	"Leaf apex emarginate, sometimes bilobed"	49
48	"Leaf apex entire"	55
49	"Base of peduncle with an involucre of scale-like bracts"	"Gastrolobium venulosum"
49	"Base of peduncle lacking an involucre of bracts, though some apparently aborted buds may be scattered along the peduncle"	50
50	"Inflorescence rachis <10 mm long; floral internodes <3 mm long"	51
50	"Inflorescence rachis >15 mm long; floral internodes generally >4 mm long"	52
51	"Keel petal scarcely auriculate, not saccate, c. 9–10 × 1.5 mm; style barely incurved; leaves light green and concolorous; flowers orange"	"Gastrolobium tergiversum"
51	"Keel petal strongly auriculate and saccate, c. 6.5–8.5 × 2 mm; style strongly incurved to hooked; leaves dark green above and often below; flowers typically yellow with red markings, almost never orange"	"Gastrolobium bilobum"
52	"Leaves >15 mm broad, not recurved; flowers predominantly red; occurs in the northern parts of WA, plus NT, Qld, ?SA"	"Gastrolobium grandiflorum"
52	"Leaves <10 mm broad, rarely flat, usually recurved to revolute; flowers yellow to orange with red markings; occurs in the SW corner of WA"	53
53	"Inflorescence rachis >70 mm long; leaves >20 mm long"	"Gastrolobium cuneatum"
53	"Inflorescence rachis <50 mm long; leaves <20 mm long"	54
54	"Leaves widely spreading to deflexed, often incurved longitudinally, oblong to linear or almost square; margins strongly recurved to revolute; ovules 4; stipules 1.5–3 mm long"	"Gastrolobium tetragonophyllum"
54	"Leaves spreading to ascending, not incurved longitudinally, cuneiform to oblong; margins flat to recurved, never revolute; ovules strictly 2; stipules 0.5–1.5 mm long"	"Gastrolobium velutinum"
55	"Leaves erect and ± appressed to the branchlet, crowded along the stem"	56
55	"Leaves spreading to erect, but never appressed to the branchlet, not crowded"	57
56	"Leaves ovate; leaf apex acute; leaves 4–7.5 × 1.5–2.5 mm"	"Gastrolobium appressum"
56	"Leaves obovate to narrowly so; leaf apex ± truncate; leaves 4–15 × 2–5 mm"	"Gastrolobium parvifolium"
57	"Leaves strongly incurved to involute"	58
57	"Leaves flat, recurved, revolute, slightly incurved (appearing concave) or longitudinally folded up"	59
58	"Leaves canaliculate, not crowded along the stems, upper surface visible; calyx 7–9 mm long; standard c. 12 mm broad; ovules 4 or 5"	"Gastrolobium semiteres"
58	"Leaves involute, crowded along the stems, upper surface not visible; calyx 4.5–5.5 mm long; standard 8–9 mm broad; ovules 2"	"Gastrolobium stenophyllum"
59	"Leaves longitudinally folded up (conduplicate)"	60
59	"Leaves flat, recurved or revolute, or rarely concave"	63
60	"Leaves obovate"	"Gastrolobium bennettsianum"
60	"Leaves ovate to elliptic"	61
61	"Calyx 6–7.5 mm long; inflorescence 5–10-flowered"	"Gastrolobium oxylobioides"
61	"Calyx <5 mm long; inflorescence >15-flowered"	62
62	"Petiole decurrent with the branchlet; stipules 3–5 mm long; peduncle 5–10 mm long; standard 5–6 mm long; occurs north of Geraldton, around Northampton, WA"	"Gastrolobium propinquum"
62	"Petioles continuous but not decurrent with the branchlet; stipules 1–2.5 mm long; peduncle 2–4 mm long; standard c. 8 mm long; occurs in the Darling escarpment around Perth, WA"	"Gastrolobium microcarpum"
63	"Leaves linear; standard >11 mm long"	"Gastrolobium callistachys"
63	"Leaves not linear; standard <10 mm long (or if longer, leaves are not linear)"	64
64	"Leaf apex recurved"	65
64	"Leaf apex not recurved"	66
65	"Leaves <5 mm broad; petiole articulate with the branchlet; young branchlets angular and somewhat pubescent; pedicels very short (0.5–1 mm long)"	"Gastrolobium hamulosum"
65	"Leaves >6 mm broad; petiole continuous with the branchlet; young branchlets ± terete and glabrous; pedicels 2–2.5 mm long"	"Gastrolobium glaucum"
66	"Leaves strongly recurved to revolute, often longitudinally incurved"	"Gastrolobium nutans"
66	"Leaves flat to slightly incurved"	67
67	"Leaves concave, unarmed"	"Gastrolobium crassifolium"
67	"Leaves flat, usually pungent-pointed"	68
68	"Inflorescences <12-flowered; standard c. 14 mm broad"	"Gastrolobium oxylobioides"
68	"Inflorescences >15-flowered; standard 7–8 mm broad"	69
69	"Leaf margins not recurved, often crenulate or undulate; lower leaf surface glabrous; leaves >7 mm broad"	"Gastrolobium microcarpum"
69	"Leaf margins recurved, not crenulate or undulate; lower leaf surface moderately pubescent; leaves <7 mm broad"	"Gastrolobium venulosum"
70	"Leaves pungent-pointed"	71
70	"Leaves unarmed but may be mucronate to stiffly mucronate"	99
71	"Leaves with 3 or more pungent angles"	72
71	"Leaves with only 1 pungent angle"	80
72	"Inflorescences in terminal, 2- or 3-flowered umbels"	"Gastrolobium aculeatum"
72	"Inflorescences in terminal or axillary racemes"	73
73	"Leaves obtriangular, margins recurved to revolute, apex strongly recurved"	"Gastrolobium diabolophyllum"
73	"Leaves ovate to triangular or obtrullate, margins flat, never recurved, apex not recurved"	74
74	"Leaves with 4 or more spines"	75
74	"Leaves with 3 spines"	77
75	"Spines per leaf 7–10; inflorescence rachis 35–50 mm long and moderately to densely pubescent; calyx 4.5–5.5 mm long; standard 5.5–6.5 mm broad"	"Gastrolobium wonganensis"
75	"Spines per leaf 4–7 (rarely up to 9), inflorescence rachis 5–25 mm long and glabrous; calyx 6–9 mm long; standard 9–13 mm broad"	76
76	"Flower-subtending bracts about twice as long as the bud, c. 6 mm long; inflorescences strictly terminal"	"Gastrolobium euryphyllum"
76	"Flower-subtending bracts shorter than the bud, 2–4.5 mm long; inflorescences terminal and/or axillary"	"Gastrolobium spinosum"
77	"Leaves obtrullate"	"Gastrolobium laytonii"
77	"Leaves ovate to triangular"	78
78	"Leaves very broadly to depressed triangular, not trilobed, all 3 pungent angles pointing in different directions"	"Gastrolobium triangulare"
78	"Leaves ovate (rarely appearing slightly triangular), trilobed, all 3 pungent angles pointing upwards"	79
79	"Inflorescence 2–7-flowered, generally axillary (rarely terminal); calyx 4–5 mm long; standard 6.5–8.5 mm broad; pod c. 5 mm long"	"Gastrolobium trilobum"
79	"Inflorescence 6- to more than 30-flowered, axillary and/or terminal; calyx 6–7 mm long; standard 9.5–13 mm broad; pod 6–10 mm long"	"Gastrolobium spinosum"
80	"At least some leaves becoming trilobed (which is often indicated by a slight bulge to either side of the apex)"	"Gastrolobium trilobum"
80	"No leaves becoming trilobed"	81
81	"Inflorescences in terminal, 2- or 3-flowered umbels"	"Gastrolobium aculeatum"
81	"Inflorescences in terminal or axillary racemes"	82
82	"Leaves upwardly canaliculate or involute"	83
82	"Leaves flat, recurved or longitudinally folded up, never canaliculate"	84
83	"Leaves strongly involute, appearing almost terete; never glaucous; flowers quite small (calyx c. 6 mm long, standard 11 mm broad)"	"Gastrolobium tenue"
83	"Leaves canaliculate, never appearing terete; usually glaucous; flowers quite large (calyx 8–14 mm long, standard 14–21 mm broad)"	"Gastrolobium calycinum"
84	"Inflorescences strictly terminal"	85
84	"Inflorescences axillary or both axillary and terminal"	94
85	"Stipules strongly recurved to reflexed"	86
85	"Stipules ascending to erect"	87
86	"Leaves glaucous, fiercely pungent-pointed; ovules 2"	"Gastrolobium reflexum"
86	"Leaves not glaucous, semi-pungent; ovules 10–12"	"Gastrolobium spectabile"
87	"Leaves canaliculate"	"Gastrolobium floribundum"
87	"Leaves flat or conduplicate, never canaliculate"	88
88	"Leaf shape trullate, obtrullate or rhombic"	"Gastrolobium laytonii"
88	"Leaf shape ovate, elliptic, obovate or linear"	89
89	"Stipules scarious, very long (>6 mm), sometimes fused at the base"	90
89	"Stipules rigid to hyaline, <5 mm long, never fused"	91
90	"Stipules somewhat fused behind the leaf; leaves 10–16 × 3–4 mm; leaf base cuneate; leaves longitudinally recurved"	"Gastrolobium densifolium"
90	"Stipules free; leaves 18–32 × 8–18 mm; leaf base rounded; leaves straight"	"Gastrolobium rotundifolium"
91	"Leaf apex recurved; leaves <17 mm long"	"Gastrolobium glaucum"
91	"Leaf apex straight; leaves >20 mm long"	92
92	"Ovules 4–5; peduncle >15 mm long; rachis <20 mm long; inflorescence axes glabrous; stipules rigid"	"Gastrolobium rigidum"
92	"Ovules 2; peduncle <10 mm long; rachis >25 mm long; inflorescence axes pubescent; stipules hyaline"	93
93	"Petiole decurrent with the branchlet; leaves not crenulate; stipules >2.5 mm long; wing petals equal in length to the keel petals"	"Gastrolobium laytonii"
93	"Petiole not decurrent with the branchlet; leaves crenulate; stipules <2.5 mm long; wing petals longer than the keel petals"	"Gastrolobium microcarpum"
94	"Leaves strictly alternate; flowers solitary or paired in the axils"	"Gastrolobium alternifolium"
94	"Leaves opposite (rarely appearing alternate); inflorescences with more than 2 flowers"	95
95	"Leaves longitudinally recurved, conduplicate (folded up longitudinally)"	96
95	"Leaves straight, not conduplicate"	97
96	"Leaves not glaucous, obovate to rhombic, apex acute"	"Gastrolobium obovatum"
96	"Leaves glaucous, obtrullate to obtriangular, apex truncate"	"Gastrolobium cyanophyllum"
97	"Young branchlets terete; leaf shape obovate to rarely oblong"	"Gastrolobium brownii"
97	"Young branchlets angular; leaf shape ovate, triangular, elliptic or orbicular"	98
98	"Leaf shape elliptic to orbicular; leaf margins somewhat undulate"	"Gastrolobium axillare"
98	"Leaf shape ovate to triangular; leaf margins flat"	"Gastrolobium spinosum"
99	"Inflorescences axillary, or both axillary and terminal"	100
99	"Inflorescences strictly terminal"	122
100	"Calyx >8 mm long; petals all predominantly red"	101
100	"Calyx <8 mm long (or if >8 mm, then petals predominantly yellow to orange); standard yellow to orange with red markings"	106
101	"Leaf margins recurved"	"Gastrolobium vestitum"
101	"Leaf margins not or very scarcely recurved"	102
102	"Calyx prominently zygomorphic; calyx hairs unicoloured; petiole not decurrent with the branchlet; wing petals auriculate on both margins; occurs in northern WA, NT, Qld and ?SA"	"Gastrolobium grandiflorum"
102	"Calyx apparently actinomorphic; calyx hairs bicoloured (rarely unicoloured); petiole decurrent with the branchlet; wing petals auriculate only on the upper margin; occurs in south-western WA, specifically in the Stirling Range"	103
103	"Flowers not resupinate, nutant; leaves narrowly oblong"	"Gastrolobium rubrum"
103	"Flowers resupinate, spreading to erect; leaves elliptic, rarely obovate or somewhat oblong"	104
104	"Stipules <4 mm long; leaf apex truncate, rarely very slightly emarginate; subtending bracts >12 mm long"	"Gastrolobium luteifolium"
104	"Stipules >7 mm long; leaf apex prominently emarginate; subtending bracts <7 mm long"	105
105	"Wing petals <16 mm long; inflorescence umbellate; leaves 50–65 × 20–40 mm; standard petal fully reflexed"	"Gastrolobium leakeanum"
105	"Wing petals >20 mm long; inflorescence usually racemose, rarely umbellate; leaves 25–58 × 11–24 mm; standard petal not fully reflexed"	"Gastrolobium mondurup"
106	"Leaves canaliculate"	107
106	"Leaves flat, recurved or longitudinally folded up, never canaliculate"	108
107	"Calyx moderately pubescent; standard petal c. 9 × 11 mm"	"Gastrolobium floribundum"
107	"Calyx glabrous; standard petal c. 7 × 10 mm"	"Gastrolobium hians"
108	"Leaf margins recurved to revolute"	109
108	"Leaf margins flat to incurved or longitudinally folded up"	113
109	"Leaf apex strongly emarginate to bilobed, or ± tricuspidate, generally strongly recurved"	110
109	"Leaf apex entire, without any lateral axes, not recurved"	112
110	"Rachis >15 mm long; petiole not decurrent with the branchlet"	"Gastrolobium polystachyum"
110	"Rachis <4 mm long; petiole decurrent with the branchlet"	111
111	"Leaves recurved, not undulate, oblong to cuneiform"	"Gastrolobium stowardii"
111	"Leaves flat, undulate, elliptic"	"Gastrolobium pulchellum"
112	"Leaves >10 mm broad; ovules 2"	"Gastrolobium lehmannii"
112	"Leaves <7 mm broad; ovules 4–8"	"Gastrolobium heterophyllum"
113	"Stipules absent or rarely minute (<0.3 mm long)"	"Gastrolobium cruciatum"
113	"Stipules prominent"	114
114	"Leaves glaucous; leaf shape ovate to orbicular"	"Gastrolobium nudum"
114	"Leaves not glaucous; leaf shape elliptic, oblong or obovate"	115
115	"Rachis >5 mm long"	116
115	"Rachis <1 mm long"	118
116	"Leaves oblong; leaf margins undulate; standard petal c. 7 mm broad"	"Gastrolobium truncatum"
116	"Leaves elliptic to obovate; leaf margins flat; standard petal >9 mm broad"	117
117	"Leaf apex acute; ovules 4–8; floral bracts trifid; petiole decurrent with the branchlet; occurs in the south-west of WA only"	"Gastrolobium capitatum"
117	"Leaf apex rounded to emarginate; ovules 2; floral bracts entire; petiole not decurrent with the branchlet; occurs in central Australia (WA, NT, rarely Qld)"	"Gastrolobium brevipes"
118	"Leaves strictly alternate"	"Gastrolobium alternifolium"
118	"Leaves opposite"	119
119	"Leaf shape oblong, apex recurved; young branchlets terete"	"Gastrolobium hookeri"
119	"Leaf shape obovate, apex straight; young branchlets angular"	120
120	"Leaves longitudinally folded up, apex acute; ovules 2"	"Gastrolobium plicatum"
120	"Leaves flat, apex rounded to tricuspidate; ovules 4–10"	121
121	"Leaves <13 mm long, apex tricuspidate; plants prostrate and mat-forming"	"Gastrolobium pusillum"
121	"Leaves >20 mm long, apex emarginate; plants small, bushy shrubs"	"Gastrolobium nervosum"
122	"Leaves orbicular"	123
122	"Leaves otherwise"	127
123	"Mature leaves densely tomentose or sericeous beneath"	124
123	"Mature leaves glabrous beneath"	125
124	"Mature leaves tomentose beneath; inflorescence rachis elongate, with floral internodes >5 mm long; prostrate or forming bushy clumps"	"Gastrolobium tomentosum"
124	"Mature leaves sericeous beneath; inflorescence rachis condensed, with floral internodes <2 mm long; erect, bushy shrubs"	"Gastrolobium congestum"
125	"Inflorescence rachis condensed, with floral internodes <2 mm long; erect, bushy shrubs"	"Gastrolobium congestum"
125	"Inflorescence rachis elongate, with floral internodes >5 mm long; prostrate, rarely forming bushy clumps"	126
126	"Leaves flat; venation very thick and dense, so that the areoles on the lower surface are reduced to pin pricks (punctate)"	"Gastrolobium ovalifolium"
126	"Leaves undulate; venation openly reticulate and not at all punctate on the lower surface"	"Gastrolobium glabratum"
127	"Inflorescence rachis condensed, with floral internodes <2 mm long"	"Gastrolobium congestum"
127	"Inflorescence rachis elongate, with floral internodes >5 mm long"	128
128	"Leaves canaliculate or involute"	129
128	"Leaves recurved, flat or slightly incurved"	132
129	"Leaves strongly involute, with the upper surface ± not visible"	"Gastrolobium involutum"
129	"Leaves canaliculate, upper surface visible"	130
130	"Standard petal 14–21 mm broad; calyx lobes not recurved"	"Gastrolobium calycinum"
130	"Standard petal 10–11 mm broad; upper calyx lobes not recurved, lower calyx lobes recurved"	131
131	"Calyx moderately pubescent; standard petal c. 9 × 11 mm"	"Gastrolobium floribundum"
131	"Calyx glabrous; standard petal c. 7 × 10 mm"	"Gastrolobium hians"
132	"Leaf margins not recurved leaves flat to undulate"	133
132	"Leaf margins recurved; leaves not undulate"	143
133	"Leaf margins undulate to strongly so; prostrate to weakly ascending shrubs"	"Gastrolobium villosum"
133	"Leaf margins flat; bushy, erect shrubs"	134
134	"Leaves linear to linear-obovate; leaves <3 mm broad"	"Gastrolobium callistachys"
134	"Leaves not linear; leaves >5 mm broad"	135
135	"Standard petal >17 mm long; standard petals red"	"Gastrolobium grandiflorum"
135	"Standard petal <15 mm long; standard petals yellow to orange with red markings"	136
136	"Ovules 2"	137
136	"Ovules 3 or more"	139
137	"Calyx >5 mm long; standard petal >10 mm broad; occurs in central-eastern WA, NT, QLD"	"Gastrolobium brevipes"
137	"Calyx <5 mm long; standard petal <7 mm broad; occurs only in south-western WA"	138
138	"Leaf base obtuse, rounded or slightly cordate; leaves <22 mm long; rachis <15 mm long; leaf length: breadth ratio 1–1.6"	"Gastrolobium pycnostachyum"
138	"Leaf base narrowly cuneate; leaves >29 mm long; rachis >25 mm long; leaf length:breadth ratio 2–3"	"Gastrolobium laytonii"
139	"Stipules recurved to reflexed; leaf base cordate"	"Gastrolobium spectabile"
139	"Stipules ascending to erect; leaf base truncate to cuneate"	140
140	"Rachis <20 mm long; plants glaucous"	"Gastrolobium rigidum"
140	"Rachis >25 mm long; plants not glaucous"	141
141	"Standard petal <10 mm broad"	"Gastrolobium parviflorum"
141	"Standard petal >15 mm broad"	142
142	"Leaf base cuneate; wing petals >13 mm long"	"Gastrolobium graniticum"
142	"Leaf base rounded to truncate; wing petals <10 mm long"	"Gastrolobium racemosum"
143	"Mature leaves glabrous beneath"	144
143	"Mature leaves at least partly pubescent beneath"	147
144	"Subtending floral bracts trifid"	"Gastrolobium ebracteolatum"
144	"Subtending floral bracts entire"	145
145	"Standard petal <8 mm long"	"Gastrolobium parviflorum"
145	"Standard petal >10 mm long"	146
146	"Leaves linear (length: breadth ratio >15)"	"Gastrolobium acrocaroli"
146	"Leaves not linear (length: breadth ratio <4)"	"Gastrolobium racemosum"
147	"Leaves cuneiform and not linear; plants prostrate"	"Gastrolobium humile"
147	"Leaves not cuneiform (or if so, then they are linear); plants not prostrate (except G. heterophyllum, which has ovate to elliptic leaves)"	148
148	"Leaf apex tricuspidate, or rarely truncate"	"Gastrolobium polystachyum"
148	"Leaf apex entire, emarginate or bilobed"	149
149	"Young branchlets terete; leaves broadly spreading to deflexed; floral internodes <3 mm long; leaves strictly oblong to linear"	"Gastrolobium tetragonophyllum"
149	"Young branchlets angular; leaves spreading to ascending; floral internodes >5 mm long; leaves oblong, elliptic, ovate, obovate or linear"	150
150	"Leaves linear-obovate; ovules 2"	"Gastrolobium callistachys"
150	"Leaves either not linear, or linear-oblong to -elliptic"	151
151	"Wing petals auriculate on the upper margin only"	152
151	"Wing petals auriculate on both margins"	154
152	"Standard petal >11 mm broad; wing petals >10 mm long"	"Gastrolobium musaceum"
152	"Standard petal <10 mm broad; wing petals <8 mm long"	153
153	"Wing petals shorter than the keel petals; leaves ovate to elliptic; leaf margins not strongly recurved; <20 flowers per inflorescence"	"Gastrolobium heterophyllum"
153	"Wing petals longer than the keel petals; leaves oblong; leaf margins strongly recurved; generally >20 flowers per inflorescence (rarely fewer)"	"Gastrolobium parviflorum"
154	"Leaf margins strongly revolute, such that only the midrib on the lower surface is visible; leaves strictly linear-oblong"	"Gastrolobium melanocarpum"
154	"Leaf margins recurved to revolute, but at least part of the lower surface is visible; leaves ovate, elliptic, oblong or linear-oblong"	155
155	"Leaves linear-elliptic to -ovate; subtending floral bracts trifid; ovules >15"	"Gastrolobium ebracteolatum"
155	"Leaves ovate, elliptic, oblong or linear-oblong; subtending floral bracts entire; ovules <8"	156
156	"Leaves linear-oblong, paler above to ± concolorous; lower surface glabrous to sparsely pubescent; standard petal >13 mm broad"	"Gastrolobium acrocaroli"
156	"Leaves ovate, elliptic or oblong, but not linear, strongly discolorous; lower surface densely sericeous with white hairs; standard petal <11 mm broad"	"Gastrolobium discolor"