1	"Leaves with 3–7 leaflets"	2
1	"Leaves simple or unifoliolate"	25
2	"Leaves with 5–7 leaflets"	3
2	"Leaves with 3 leaflets"	4
3	"Leaflets obovate to oblanceolate, length/width ratio 2–4"	"Crotalaria grahamiana"
3	"Leaflets elliptic to linear, length/width ratio 6–16"	"Crotalaria quinquefolia"
4	"Corolla 17–55 mm long; hypanthium prominent, ridged"	5
4	"Corolla 5–15 mm long; hypanthium not prominent"	6
5	"Calyx 18–30 mm long; pod 7–10 cm long"	"Crotalaria agatiflora"
5	"Calyx 9–17 mm long; pod 2–5 cm long"	"Crotalaria laburnifolia subsp. laburnifolia"
6	"Lateral leaflets less than ½ the length of the terminal leaflet"	"Crotalaria eremaea subsp. eremaea"
6	"Lateral leaflets more than ½ the length of the terminal leaflet"	7
7	"Pod 3–7 mm long; seeds 1 or 2; keel petal twisted at apex"	8
7	"Pod more than 7 mm long; seeds more than 2; keel beak twisted or not"	13
8	"Corolla 3–8 mm long; pod 3–5.5 mm long, beak c. 1 mm long"	9
8	"Corolla 8–14 mm long; pod 5–7 mm long; beak c. 1–3 mm long"	11
9	"Leaflets 0.5–3 mm wide, length/width ratio 13–35"	"Crotalaria medicaginea var. linearis"
9	"Leaflets 1–10 mm wide, length/width ratio 2–15"	10
10	"Plants ascending, to 30 cm; calyx 2–3 mm long; keel petal 3–4 mm long; pod 3–4 mm long"	"Crotalaria medicaginea var. medicaginea"
10	"Plants mostly erect, to 1 m; calyx 2.5–4.5 mm long; keel petal 4–7.5 mm long; pod 4–5.5 mm  long"	"Crotalaria medicaginea var. neglecta"
11	"Leaves crowded on stem; leaflets 1–5 mm wide, length/width ratio 5–32"	"Crotalaria aridicola subsp. densifolia"
11	"Leaves not crowded; leaflets 3–8 mm wide; length/width 2–5"	12
12	"Stems, pods and lower surface of leaflets with spreading, hairs 0.5–1 mm long"	"Crotalaria aridicola subsp. aridicola"
12	"Stems, pods and lower surface of leaves with appressed hairs 0.1–0.5 mm long"	"Crotalaria aridicola subsp. glabrata"
13	"Stipules falcate, 5–25 mm long; pod held erect"	"Crotalaria goreensis"
13	"Stipules, if present, ovate, obovate, lanceolate or filiform-subulate, 1–12 mm long; pod spreading or deflexed"	14
14	"Stipules in unequal pairs, plants prostrate"	"Crotalaria inaequalis"
14	"Stipules in each pair subequal; plants erect, ascending or prostrate"	15
15	"Calyx lobes more than twice the length of the tube; corolla scarcely exceeding calyx"	16
15	"Calyx lobes shorter or slightly longer than the tube; corolla much longer than calyx"	17
16	"Stem hairs less than 1 mm long; bract 1–3 mm long; calyx lobes 4–6 mm long"	"Crotalaria incana subsp. incana"
16	"Stem hairs 1.5–2 mm long; bract 4–10 mm long; calyx lobes 6–9 mm long"	"Crotalaria incana subsp. purpurascens"
17	"Calyx lobes equal to or longer than the tube"	18
17	"Calyx lobes shorter than the tube"	22
18	"Calyx 7–13 mm long; bract 7–13 mm long; wings longer than keel"	"Crotalaria micans"
18	"Calyx 2.5–8 mm long; bract 0.7–5 mm long; wings shorter than or equalling keel"	19
19	"Pods 5–7 cm long, 1.5–2 cm wide"	"Crotalaria ochroleuca"
19	"Pods 1–5 mm long, 0.3–0.8 mm wide"	20
20	"Pod 3–5 cm long; pedicel 3–7 mm long"	"Crotalaria pallida var. obovata"
20	"Pod 1.1–2.2 cm long; pedicel 1–4 mm long"	21
21	"Upper surface of leaflets always glabrous; keel 8–13 mm long"	"Crotalaria dissitiflora subsp. dissitiflora"
21	"Both surfaces of leaflets pubescent; young leaflets usually bullate or rugose in appearance from arrangement of pubescence at veins; keel 7–17 mm long"	"Crotalaria dissitiflora subsp. rugosa"
22	"Wing petals longer than the keel; calyx 2–4 mm long"	"Crotalaria lanceolata subsp. lanceolata"
22	"Wing petals equal to or shorter than the keel; calyx 3–7 mm long"	23
23	"Standard with red-brown veins; wings with a large purple spot at base; pod 38–45 mm long"	"Crotalaria trichotoma"
23	"Standard yellow with no other colorations; pod 11–22 mm long"	24
24	"Upper surface of leaflets always glabrous; keel 8–13 mm long"	"Crotalaria dissitiflora subsp. dissitiflora"
24	"Both surfaces of leaflets pubescent; young leaflets usually bullate or rugose in appearance from arrangement of pubescence at veins; keel 7–17 mm long"	"Crotalaria dissitiflora subsp. rugosa"
25	"Stipules decurrent, forming wings along the stem 3–5 mm wide"	"Crotalaria alata"
25	"Stipules not decurrent, stems not winged"	26
26	"Stipules in unequal pairs, one much larger than the other; calyx 5–7.5 mm long and calyx lobes subequal and more than twice the calyx tube"	"Crotalaria inaequalis"
26	"Stipules similar to each other; calyx either more than 7 mm long or if shorter, then calyx lobes unequal or lobes less than twice the length of the calyx tube"	27
27	"Stipules semi-lunate or falcate, 5–35 mm long"	28
27	"Stipules ovate, linear-lanceolate or subulate, 0.5–15 mm long"	29
28	"Leaf margins undulate; corolla mauve to blue"	"Crotalaria verrucosa"
28	"Leaf margins flat; corolla yellow"	"Crotalaria beddomeana"
29	"Ovary hairy; pod hairy or glabrous (with age)"	30
29	"Ovary and pod always glabrous"	37
30	"Corolla 24–43 mm long, greenish-yellow"	"Crotalaria cunninghamii subsp. sturtii"
30	"Corolla less than 20 mm long, yellow, yellow-brown, mauve or blue"	31
31	"Pod 6–9 mm long, equalling calyx; plants often viscid; calyx lobes usually with a reflexed margin"	32
31	"Pod 10–40 mm long, much longer than calyx; plants never viscid; calyx lobe margins flat"	33
32	"Calyx lobes oblong, 1–3.5 mm wide, the margins narrowly reflexed, the reflexed portion to 1 mm wide"	"Crotalaria ramosissima"
32	"Calyx lobes ovate to suborbicular, 3–7.5 mm wide, the margins markedly reflexed, reflexed portion 1–2.5 mm wide"	"Crotalaria crispata"
33	"Calyx-lobes longer than tube; pod densely velvety hairy"	"Crotalaria juncea"
33	"Calyx-lobes equal to or shorter than tube; pod pubescent or glabrous"	34
34	"Keel petal twisted at apex; bracteoles inserted on the pedicel"	35
34	"Keel petal not twisted at apex; bracteoles inserted at base of calyx"	36
35	"Both surfaces of leaflet lamina densely pubescent, hairs often ferruginous; base rounded or cordate; veins forming an angle of 70˚–90˚ to the midrib; bracteoles inserted at or above the midpoint of the pedicel"	"Crotalaria novae-hollandiae subsp. lasiophylla"
35	"Upper surface of leaflet lamina pubescent or glabrous; lower surface appressed pubescent, hairs usually white; base rounded to cuneate, apex variable; veins forming an angle of 30˚–60˚ to the midrib; bracteoles on lower half of pedicel"	"Crotalaria novae-hollandiae subsp. novae-hollandiae"
36	"Leaves trifoliolate or unifoliolate; leaflets all similar, oblong, always pubescent on upper surface; lateral leaflets, if present, reduced; stipules less than 1 mm long, often obscured; flowers variable, small, keel beak rounded or straight"	"Crotalaria eremaea subsp. eremaea"
36	"Leaves usually unifoliolate, rarely trifoliolate with small, circular lateral leaflets; leaflets ovate to elliptic, upper surface glabrous or nearly so; stipules up to 1.5 mm long; flowers usually large, with a straight beak, sometimes small and round"	"Crotalaria eremaea subsp. strehlowii"
37	"Leaves unifoliolate (the petioles with a distinct articulation)"	38
37	"Leaves simple (the petioles without an articulation)"	40
38	"Corolla 5–8 mm long; leaf lamina densely hairy on both surfaces, length/width ratio 1–2"	"Crotalaria smithiana"
38	"Corolla 7–18 mm long; leaf lamina glabrous or pubescent on the upper surfaces, length/width ratio more than 1.5"	39
39	"Both surfaces of leaflet lamina densely pubescent, hairs often ferruginous; base rounded or cordate; veins forming an angle of 70˚–90˚ to the midrib; bracteoles inserted at or above the midpoint of the pedicel"	"Crotalaria novae-hollandiae subsp. lasiophylla"
39	"Upper surface of leaflet lamina pubescent or glabrous; lower surface appressed pubescent, hairs usually white; base rounded to cuneate, apex variable; veins forming an angle of 30˚–60˚ to the midrib; bracteoles on lower half of pedicel"	"Crotalaria novae-hollandiae subsp. novae-hollandiae"
40	"Corolla much longer than calyx"	41
40	"Corolla equalling calyx, or slightly longer"	44
41	"Calyx 4–6 mm long; wing petals equal to or shorter than keel"	42
41	"Calyx 8–20 mm long; wing petals longer than keel"	43
42	"Leaves elliptic to obovate, 4–14 cm long, 1.5–6 cm wide, acute or obtuse; racemes dense; flowers 30–80"	"Crotalaria mitchellii subsp. mitchellii"
42	"Leaves narrowly elliptic to oblanceolate, 2–11 cm long, 0.7–2.5 cm wide, rounded or emarginate; racemes lax; flowers 10–30"	"Crotalaria mitchellii subsp. laevis"
43	"Stipules ovate, 2.5–10 mm long"	"Crotalaria spectabilis subsp. spectabilis"
43	"Stipules linear to subulate, 1–2 mm long"	"Crotalaria retusa var. retusa"
44	"Calyx 8–35 mm long, the lobes more than twice the length of the tube"	45
44	"Calyx 4–7 mm long, lobes slightly longer or shorter than the tube"	46
45	"Corolla yellow, 12–18 mm long; calyx 18–35 mm long"	"Crotalaria calycina"
45	"Corolla blue, 8–10 mm long; calyx 8–17 mm long"	"Crotalaria sessiliflora var. anthylloides"
46	"Stems prostrate, pilose; leaves ovate to obovate, length/width ratio 1–2"	"Crotalaria humifusa"
46	"Stems ascending or erect, pubescent; leaves narrowly oblong-elliptic or linear, length/width ratio 2–24"	47
47	"Leaves 0.6–3.5 cm long; length/width ratio 2–8; racemes with 1–10 flowers; standard petal acute or rounded at apex"	"Crotalaria brevis"
47	"Leaves 2–8 cm long, length/width ratio 5–20; racemes with 7–35 flowers; standard petal emarginate at apex"	48
48	"Pod 5–8 mm long"	"Crotalaria montana var. angustifolia"
48	"Pod 8–12 mm long"	"Crotalaria montana var. exserta"