1	"Tall shrubs or small trees of mangrove habitats. Petiole base expanded to enclose axillary bud. Sepals and petals identical and forming a single whorl of 8, free (tribe Osbornieae)"	"Osbornia: Osbornia octodonta"
1	"Dwarf shrubs to tall trees, never occurring in mangrove communities. Petioles not expanded, sometimes absent. Sepals 4–6 or rarely absent and petals 4–6, sometimes one or both whorls united into a deciduous operculum"	2
2	"Fruit indehiscent, succulent or somewhat succulent (a berry or drupe). Occurring in the northern part of the Kimberley Region"	3
2	"Fruit indehiscent or dehiscent, membranous to very woody (a nut or capsule). Widespread in Western Australia or restricted to the south"	5
3	"Young stems glabrous. Inflorescence of terminal and/or axillary cymes or panicles of cymes. Sepals free or united into an operculum, glabrous. (tribe Syzygieae)"	Syzgium
3	"Young stems hairy. Inflorescence of solitary axillary flowers or rarely axillary cymes. Sepals free, densely hairy outside or densely ciliate. (tribe Myrteae)"	4
4	"Sepals and petals 4, sparsely hairy or glabrous outside, densely ciliate. Stamens all or some longer than petals"	"Eugenia: Eugenia reinwardtiana"
4	"Sepals 5, densely hairy; petals 5, moderately hairy outside. Stamens shorter than petals"	"Lithomyrtus: Lithomyrtus retusa"
5	"Sepals and/or petals united into an operculum, which is shed when the bud opens. (tribe Eucalypteae)"	6
5	"Sepals and petals free or shortly united, one or both whorls usually persistent in flower"	7
6	"Cotyledons reniform. Hairs commonly present on juvenile plants and sometimes on young stems and leaves. Seeds very compressed and/or with a terminal wing"	Corymbia
6	"Cotyledons 2-lobed. Hairs absent. Seeds terete or angled to somewhat compressed, sometimes winged along the angles"	Eucalyptus
7	"Ovary almost superior, developing into a capsule with longitudinal dehiscence. (Occurring in the Kimberley Region). (tribe Xanthostemoneae)"	Xanthostemon
7	"Ovary usually inferior or largely inferior, developing either into a capsule that is dehiscent by terminal valves or into an indehiscent fruit"	8
8	"Flowers pedicellate, in loose axillary cymes 20–100 mm long (including peduncle). Occurring in the Kimberley Region"	9
8	"Flowers sessile or stalked, solitary in the axils or in varied arrangements but not as above. Widespread in Western Australia or restricted to the south"	10
9	"Stems with a milky sap. Stamens united into 5 antipetalous fascicles. Fruit dehiscent by 3 valves. (tribe Lophostemoneae)"	"Lophostemon: Lophostemon grandiflorus"
9	"Stems without a milky sap. Stamens free. Fruit indehiscent. (tribe Backhousieae)"	"Backhousia: Backhousia gundarara"
10	"Ovary (2)3–5-locular; ovules 1–230, when numerous arranged in multiple rows across the placenta. Fruit a valvate capsule, sessile. Seeds narrow in most genera, with a membranous or papery testa. Embryo with cotyledons equalling or longer than the hypocotyl"	11
10	"Ovary 1–3(–5)-locular; ovules 1–12(–25) per loculus, when numerous arranged either in 2 parallel rows or in a circle (i.e. radiating from the centre of the placenta). Fruit either indehiscent or containing seeds with a hard testa. Embryo with cotyledons much smaller than the large hypocotyl. (tribe Chamelaucieae)"	28
11	"Stamens united into long antipetalous fascicles greatly exceeding the length of the petals, sometimes with the fascicles also united to one another"	12
11	"Stamens free, shorter than to slightly exceeding petals in most genera but distinctly longer in Callistemon and Kunzea"	20
12	"Placentas axile-basal, with a moderate number of ovules, not peltate. Seeds narrowly elliptic to obovate in outline, distally winged. Occurring in the Kimberley Region. (tribe Leptospermeae p.p.)"	"Asteromyrtus: Asteromyrtus arnhemica"
12	"Placentas axile-medial, with 1–230 ovules, peltate when ovules numerous. Seeds of varied shape, often narrowly oblong to linear in outline, not winged or with lateral wings. Restricted to southern and central parts of Western Australia except for Melaleuca, which is widespread (tribe Melaleuceae p.p.)"	13
13	"Anthers attached by the base, erect, the cells often divergent, opening in various ways (transversely, longitudinally or by pores)"	14
13	"Anthers dorsifixed, versatile, with parallel cells opening longitudinally"	18
14	"Anther cells opening at the top by transverse slits. Ovules 1 per loculus"	Beaufortia
14	"Anther cells opening by terminal pores or opening outwards by transverse or longitudinal slits. Ovules 2 to numerous per loculus"	15
15	"Anther cells opening outwards by transverse slits"	Phymatocarpus
15	"Anther cells opening by longitudinal slits or pores"	16
16	"Leaves usually at least 20 mm long. Stamen fascicles 4 or sometimes 5, usually red"	Calothamnus
16	"Leaves usually not exceeding 15 mm long. Stamen fascicles 5, of varied colours"	17
17	"Leaves opposite and decussate. Flowers in dense heads. Ovules 4 per loculus"	Regelia
17	"Leaves alternate. Flowers solitary or in small clusters of 2 or 3. Ovules 7–23 per loculus"	Eremaea
18	"Stamen fascicles united into a tube for at least half their length"	Lamarchea
18	"Stamen fascicles separate or shortly united at the base"	19
19	"Leaves opposite. Ovules 1 per loculus"	Conothamnus
19	"Leaves alternate or rarely opposite. Ovules 2–230 per loculus"	Melaleuca
20	"Stamens distinctly longer than the petals"	21
20	"Stamens shorter than to just exceeding the petals. (tribe Leptospermeae p.p.)"	22
21	"Leaves 30 mm or more long. Flowers red, 20–30 mm long, in a subterminal cylindrical spike up to 120 mm long. (tribe Melaleuceae p.p.)"	Callistemon
21	"Leaves up to 15 mm long. Flowers usually pink, white or yellow and 4–20 mm long but red and c. 30 mm long in one species, in a head or rarely a short spike, usually terminal. (tribe Leptospermeae p.p.)"	Kunzea
22	"Leaves opposite. Fruit thin-walled"	Kunzea
22	"Leaves alternate. Fruit woody"	23
23	"Flowers in dense, globular, axillary or terminal heads. Petals tending to persist after flowering. Ovules and seeds erect or ascending"	24
23	"Flowers solitary, loosely arranged or clustered but not in globular heads. Petals deciduous. Ovules and seeds horizontal or pendulous"	26
24	"Stamens 10, with 1 opposite each sepal and petal. Ovules 2(3) per loculus"	Taxandria
24	"Stamens more than 10, with 3–7 opposite each sepal and 1 or none opposite each petal, i.e. mostly antisepalous. Ovules 3–14 per loculus"	25
25	"Leaves not clustered. All stamens antisepalous, none opposite the petals"	Agonis
25	"Leaves densely clustered. Antipetalous stamens present as well as antisepalous ones"	"Paragonis: Paragonis grandiflora"
26	"Leaves grading into bracts. Seeds 1 per loculus, developed from the basal ovule (i.e. the upper ‘locules’ functionally ovulodes)"	Pericalymma
26	"Leaves quite distinct from the bracts. Seeds not restricted to 1 per loculus (i.e. more than 1 true ovule present in each loculus)"	27
27	"Anthers not ridged. Ovary summit glabrous or hairs not forming radiating bands. Seeds varied but not as below"	Leptospermum
27	"Anthers with 2 abaxial ridges on each side of connective. Ovary summit with radiating bands of hairs delimiting the loculi. Seeds disc-shaped, winged"	"Homalospermum: Homalospermum firmum"
28	"Flowers in a daisy-like inflorescence with the outer flowers sterile, 4-merous, with 4 petaline sepals, 4 petals and 8 stamens"	Actinodium
28	"Flowers variously arranged, all fertile, 4–6-merous and usually with sepals and petals dissimilar, if 4-merous then sepals absent, never with a constant stamen number of 8"	29
29	"Androecium with 20 filaments (stamens or staminodes) united at base into a ring, the antipetalous ones always stamens and those alternating with the petals and sepals usually staminodes; staminodes (present in all genera except Pileanthus) varying from tooth-like or filiform to expanded and resembling a small petal. Fruit 1-locular, indehiscent"	30
29	"Androecium of 3–150 free or united filaments, not consistently with 20 filaments; staminodes absent or not constant in number, not arranged as described above, never petal-like but sometimes retaining the connective gland. Fruit 1–5-locular, indehiscent or dehiscent"	33
30	"Sepals deeply 2-lobed. Stamens 20. Staminodes absent"	Pileanthus
30	"Sepals entire to greatly divided, sometimes with accessory lobes. Stamens 10 or rarely 5. Staminodes 10 or rarely 15"	31
31	"Sepals deeply divided; petals deeply divided to entire"	"Verticordia s. lat."
31	"Sepals and petals never deeply divided, margin entire, denticulate or ciliate"	32
32	"Anthers dehiscent by 2 longitudinal slits. Ovules 4–10"	Chamelaucium
32	"Anthers dehiscent by 2 terminal pores. Ovules 2"	"Darwinia s. lat."
33	"Leaves alternate (except in a few species of Calytrix). Petals and stamens erect in bud (except in most species of Homalocalyx). Hypanthium often very slender. Stamens 10–150; anther dorsifixed and usually versatile. Ovary 1-locular, with 2 ovules (except 1 species with 3 or 4 ovules)"	34
33	"Leaves opposite or whorled. Petals and stamens inflexed in bud or rarely petals sub-erect. Hypanthium moderately slender to very broad. Stamens 3–60 or if more numerous then anther ± basifixed. Ovary 1–5-locular, with 1–25 ovules per loculus"	35
34	"Stamens all or mostly erect in bud. Sepals long-awned in most species. Embryo straight, the cotyledons erect"	Calytrix
34	"Stamens all inflexed in bud except in H. ericaeus. Sepals not awned. Embryo curved, with cotyledons on a slender neck appressed to a massive hypocotyl"	Homalocalyx
35	"Connective gland free from the filament and anther cells, usually obvious and dorsal or terminal but if gland not obvious then cells free and long"	36
35	"Connective gland adnate to the filament or cells or fully incorporated with fused cells into a very modified anther, the cells often short"	50
36	"Anthers basifixed or with filament attached almost at base of connective. Seeds often with a prominent adnate protrusion along the inner surface"	37
36	"Anthers dorsifixed near centre of dorsal surface, but in one genus (Rinzia) adnate to the inner surface of a flattened filament. Seeds either with a free aril on inner surface or with no obvious inner protrusion"	40
37	"Anther cells close at apex but very divergent at base, the connective triangular, with a wide basal attachment. Seeds strongly facetted, with no inner protrusion"	"Seorsus: Seorsus clavifolius"
37	"Anther cells ± parallel, the connective not much broader at base than at top. Seeds not facetted or with facets poorly developed, often with an obvious inner protrusion"	38
38	"Stamens 8–30, united into an undulating or fairly level petaline ring (the leaves always opposite-decussate). Seed body and enclosed embryo broadest towards distal end of the fruit loculus"	Cyathostemon
38	"Stamens 3–125 in varied arrangements (if androecium as above then leaves in whorls of three). Seed body and enclosed embryo broadest towards base or outer margin of the fruit loculus"	39
39	"Leaves tending to be fasciculate, always narrow. Stamens 3–60, when very few then all or mostly widely spaced, when more numerous then all or mostly in antisepalous fascicles. Seeds 0.5–1.3 mm long, thin-walled or moderately thick-walled"	Astartea
39	"Leaves never fasciculate, sometimes broad. Stamens 10–125, basally united into a continuous circle or, when few, sometimes with gaps present. Seeds 0.8–2.3 mm long, thick-walled"	Hypocalymma
40	"Style base inserted in a depression. Fruit 2–5-locular, dehiscent or if indehiscent (Enekbatus) then with a very thick hard wall. Seeds ± reniform (rarely obovoid), sometimes with a whitish free aril; testa thick, hard, usually colliculate or tuberculate"	41
40	"Style base not in a depression. Fruit 1(2)-locular, indehiscent, thin- or moderately thick-walled. Seeds of very varied shapes including reniform, never arillate; testa very thin, membranous, smooth"	47
41	"Androecium of 5–12 stamens; antipetalous filaments 0.5–1 mm wide, emarginate, truncate or obtuse; antisepalous filaments (when present) united shortly at base or for half to nearly their full length to the antipetalous filaments; anthers attached to inner surface of filament"	Rinzia
41	"Androecium of 3–30 stamens; filaments very slender or rarely up to 0.6 mm wide, attenuate at apex, free; anthers with a narrow dorsal attachment at slender summit of filament"	42
42	"Ovary 2–5-locular, sometimes with one loculus sunken below the others or with 2 superposed ovules in each loculus. Fruit fully indehiscent or with 2 upper loculi dehiscent and a somewhat lower loculus indehiscent"	43
42	"Ovary 3-locular in all or most flowers, with ovules collateral or in 2 rows. Fruit with all loculi dehiscent"	44
43	"Flowers ± sessile. Hypanthium circular in transverse section. Ovary loculi usually all with 2 ovules. Fruit with all of the 2–5 loculi at the same level, fully indehiscent"	Enekbatus
43	"Flowers stalked. Hypanthium 5-angled. Ovary loculi with 1–7 ovules, upper loculi usually with more than 2 ovules.Fruit with loculi at two overlapping levels, lower level with an indehiscent loculus and upper level with 2 dehiscent loculi"	Astus
44	"Leaves with parallel venation usually visible on upper surface. Peduncles 0.5–9 mm long, 1–4-flowered. Antipetalous processes forming prominent groups. Seeds usually with an obvious free whitish aril surrounding a small hilum"	Euryomyrtus
44	"Leaf venation obscure or not as above. Peduncles ± absent or up to 0.6 mm long, 1-flowered. Antipetalous processes free and inconspicuous or absent. Seeds without an aril but sometimes with a large concave or flat hilum"	45
45	"Filaments of antipetalous stamens flat, 0.25–0.6 mm wide throughout. Seeds without any obvious cavity or large hilum; testa minutely colliculate"	"Rinzia (=Latistemon ms)"
45	"Filaments narrow for all or most of their length, less than 0.25 mm wide in distal half. Seeds either with a large concave or flat hilum on inner surface or with the testa tuberculate"	46
46	"Androecium with 5–20 stamens but no regularly occurring staminodes, with varied arrangements of the stamens but rarely exactly as in the next choice. Ovules 2 per loculus. Seeds 1.1–1.5 mm long, with a large concave and longitudinally divided hilum; testa colliculate"	"‘Baeckea’ (=Semasperma ms)"
46	"Androecium with a circle of 16–36 members consisting of 3 or 4 long stamens opposite each petal (i.e. antipetalous) and with shorter antisepalous stamens or staminodes. Ovules 3–5 in all or some loculi. Seeds 1.6–2.2 mm long, with hilum either small or flat, not divided; testa tuberculate"	"‘Baeckea’ (=Aethestemon ms & Xeromesos ms)"
47	"Stamens 5–10, with one stamen opposite each petal (i.e. antipetalous) and sometimes also opposite all or some of the sepals; antisepalous stamens (when present) shorter and often lower than antipetalous stamens; anther cells ± parallel or divergent at summit. Ovules somewhat pendulous from a placenta that is located towards summit of ovary"	48
47	"Stamens 5–40, if few then all antisepalous, if 10 then often alternating with the sepals and petals, in the few species with 10 opposite sepals and petals the anther cells divergent at the base. Ovules erect, attached laterally or towards the base of ovary"	49
48	"Peduncle fused at summit to the bracteoles and flower. Sepals dimorphic, the 2 abaxial sepals broad and the 3 adaxial sepals narrower. Anthers terminated by a long-stalked connective gland"	Corynanthera
48	"Peduncle free. Sepals ± equal. Anthers with a short unstalked connective gland"	Micromyrtus
49	"Hypanthium reticulate-pitted or closely wrinkled. Connective gland (of the anther) with a long obovoid body directed towards outside of flower. Disc markedly reticulate-pitted. Ovules 4–6"	Aluta
49	"Hypanthium with 5–16 irregular longitudinal ribs or smooth or rugose. Connective gland (of the anther) with a compact body, directly above top of cells and directed inwards. Disc smooth or with prominent oil glands. Ovules 2 in most species but up to 10"	"Thryptomene s.lat."
50	"Anthers helmet- or shield-like, often with a groove along each side or distally 2-lobed. Filaments compressed, numerous and continuous or less commonly few and antisepalous (i.e. with gaps opposite the petals)"	51
50	"Anthers of varied shape including globular to obloid but not as in the above choice. Filaments of varied shape and arrangement, sometimes matching above choice"	52
51	"Peduncles 1-flowered. Flowers with petals 4–7 mm long, sepals 1.1–1.6 mm long and 12–45 stamens"	Anticoryne
51	"Peduncles 1–20-flowered. Flowers with petals 1.3–6.5 mm long (if petals more than 5 mm long then sepals 0.2–1.1 mm long) and 3–25 stamens. Occurring from north of Geraldton to the Mount Barker area"	Babingtonia
52	"Fruit indehiscent, 1–3-locular, usually with a maximum of 1 seed per loculus"	53
52	"Fruit dehiscent by 2 or 3 terminal valves, usually with multiple seeds per loculus"	56
53	"Ovules 1 or 2 per loculus"	Scholtzia
53	"Ovules 3–20 per loculus"	54
54	"Ovary 1-locular; ovules 3–8"	"Malleostemon s. lat."
54	"Ovary 2- or 3-locular; ovules 4–20 per loculus"	55
55	"Petals white. Stamens 16–29. Ovules 4–14 per loculus. Fruit not very woody"	"‘Baeckea’ {=B. pentagonantha F.Muell. group and B. sp. Melita Station (H. Pringle 2738)}"
55	"Petals bright pink or orange to red. Stamens 30–60. Ovules 10–20 per loculus. Fruit very woody"	Cheyniana
56	"Hypanthium petaloid, orange to red, 9–20 mm long, with sepals and petals the same colour. Style 20–24 mm long at maturity"	"Balaustion: Balaustion pulcherrimum"
56	"Hypanthium herbaceous, green to reddish, 0.5–4 mm long, with sepals and/or petals contrasting in colour. Style 0.7–12 mm long at maturity"	57
57	"Fruit fully inferior, with the style inserted within a broad funnelled depression (which is also visible on the ovary of dried flowers)"	"Oxymyrrhine s.str."
57	"Fruit usually partially superior, with apex level or raised, the style terminal or inserted within a narrowly cylindrical depression"	58
58	"Anthers globular, 0.2–0.3 mm long, black"	Tetrapora
58	"Anthers of varied shapes, if globular then not as above"	"‘Baeckea’ (= Many groups including Tilophloia ms & Orthomorphus ms)"