1	"Leaves simple"	2
1	"Leaves with 3 or more leaflets"	6
2	"Pods globular or lunate, 1–12 mm long; flowers rose red"	3
2	"Pods more or less linear or slightly curved, usually more than 10 mm long; flowers pink or purple"	4
3	"Leaves linear; pods globular, 1–3 mm diameter"	"Indigofera linifolia"
3	"Leaves ovate to oblong-elliptic; pods lunate, 6–12 mm long (one locality on the eastern side of Cape York, doubtfully naturalised)"	"Indigofera drepanocarpa"
4	"Leaves obovate to elliptic, 5–17 mm wide (north Qld, Mt Surprise area only)"	"Indigofera rupicola"
4	"Leaves linear to narrow elliptic or narrowly ovate, 1–8 mm wide"	5
5	"Stipules short and triangular, to 1 mm long; inflorescence with 3 or more flowers"	"Indigofera haplophylla"
5	"Stipules linear, subulate, to 4 mm long; inflorescence usually only 3 flowered"	"Indigofera triflora"
6	"All leaves with 3 leaflets only"	7
6	"Majority of leaves with 5 or more leaflets"	11
7	"Lower surface of leaflets with conspicuous discoid glands"	8
7	"Lower surface of leaflets without glands"	9
8	"Pods 5–6 mm long with fringe-like appendages; stipules 1.5–3 mm long; leaves distinctly pinnate"	"Indigofera glandulosa"
8	"Pods 7–15 mm long, lacking fringe-like appendages; stipules less than 1 mm long; leaves subdigitate, occasionally pinnate"	"Indigofera trifoliata"
9	"Inflorescences less than 4 cm long, shorter than the leaf; flowers red or orange-red"	"Indigofera trita subsp. trita"
9	"Inflorescences more than 4 cm long, usually longer than the leaf; flowers pink or purple"	10
10	"Flowers 6–8 mm long; pods 30–50 mm long, 2.5–3 mm diam."	"Indigofera ewartiana"
10	"Flowers 4–5.5 mm long; pods 20–30 mm long, c. 1.5 mm diam."	"Indigofera polygaloides"
11	"Leaflets arranged alternately along the rachis"	12
11	"Leaflets arranged opposite each other on the rachis, or rarely a few leaves with alternate leaflets"	16
12	"Pods coiled (common weed naturalised in lawns in southeast Qld)"	"Indigofera circinella"
12	"Pods straight or curved, not coiled"	13
13	"Pods 3–8 mm long, with 2 seeds"	"Indigofera linnaei"
13	"Pods 10–40 mm long with at least 4 seeds"	14
14	"Erect subshrub with densely pubescent grey stems; persisting staminal tube 4–8 mm long (near Roma in southern Qld only, doubtfully naturalised)"	"Indigofera schimperi"
14	"Spreading prostrate or ascending perennial herb with sparsely strigose brown stems; persisting staminal tube 3–5 mm long"	15
15	"Leaves with 3–9 obovate leaflets; inflorescences to 10 cm long; mature pods less than 20 mm long, apiculate, straw coloured (common weed naturalised in lawns in southeast Qld)"	"Indigofera spicata"
15	"Leaves with 9–11 oblanceolate leaflets; inflorescences to 23 cm long; mature pods more than 20 mm long, with a distinct beak, dark brown (naturalised in north Qld near Malanda)"	"Indigofera hendecaphylla"
16	"Flowers 14–18 mm long; leaflets ovate or elliptic, 2 –6 cm long (southeast Qld)"	"Indigofera decora"
16	"Flowers 4–13 mm long; leaflets variable in shape, usually smaller or narrower"	17
17	"Pods and stems with at least some erect glandular hairs, rarely on pods only"	"Indigofera colutea"
17	"Pods and stems lacking erect glandular hairs"	18
18	"Pods distinctly curved throughout"	19
18	"Pods straight, or curved only at the tip"	20
19	"Pods 10–20 mm long"	"Indigofera suffruticosa"
19	"Pods 25–35 mm long"	"Indigofera tinctoria"
20	"Leaf rachis distinctly flattened, usually more than 2 mm wide, with very dense patches of coloured hairs between leaflets; the leaflets mostly less than 7 mm long, very often deciduous leaving a flattened rachis appearing to be segmented by hair tufts"	"Indigofera adesmiifolia"
20	"Leaf rachis grooved, channelled or terete (not flattened); hairs between leaflets sparse or dense or absent; leaflets persistent or not"	21
21	"Leaflets linear, 0.5–1 mm wide, glabrous or nearly so, with a distinct recurved tip; pods glabrous (western Qld)"	"Indigofera haematica"
21	"Leaflets variously shaped but more than 1 mm wide, pubescent or glabrous, tip not slightly recurved; pods glabrous or pubescent"	22
22	"Flowers 10 mm or more long"	23
22	"Flowers less than 10 mm long"	27
23	"Leaflets 4–11 mm long and 1–4 mm wide"	"Indigofera bancroftii"
23	"At least some leaflets either more than 11 mm long or more than 4 mm wide"	24
24	"Pedicels 3–7 mm long; leaves with (5–) 7–11 leaflets"	"Indigofera scabrella"
24	"Pedicels 1–2.5 mm long; leaves with (7–) 9–29 leaflets"	25
25	"Pods, stems and leaves sparsely appressed pubescent (widespread and variable)"	"Indigofera pratensis"
25	"Pods, stems and leaves densely pubescent"	26
26	"Stipules linear, 5–12 mm long; leaves with 15–21 oblong to obovate leaflets; stipels present (north Qld)"	"Indigofera sericovexilla"
26	"Stipules triangular, 2–5 mm long; leaves with (7–) 9–17 leaflets; stipels absent (widespread and variable)"	"Indigofera queenslandica"
27	"Pods and stems densely covered with long stiff spreading or oblique hairs; calyx lobes long attenuate, c. 4 mm long and free almost to the base, and setaceous with long stiffly spreading hairs to 1 mm long"	"Indigofera hirsuta"
27	"Pods and stems with short appressed pubescence, or glabrous; calyx lobes triangular and less than 3 mm long, with short appressed or spreading hairs less than 0.5 mm long"	28
28	"Pods 1.5–2 mm wide; inflorescence with 1–7 coral pink flowers; leaves including the rachis deciduous as a whole, leaving only persistent joined stipules at base (naturalised in Shoalwater Bay area only)"	"Indigofera vohemarensis"
28	"Pods at least 2 mm wide; inflorescences mostly with more than 7 flowers that are pink, mauve, purple, or red; leaflets, if deciduous, leaving a persistent rachis"	29
29	"Leaf rachis extended beyond terminal leaflet, spinescent; leaflets often deciduous leaving a bare spine-tipped rachis (south western Qld)"	"Indigofera oxyrachis"
29	"Leaf rachis not extended beyond terminal leaflet, not spinescent; leaflets usually not deciduous"	30
30	"Leaflets cuneate and very densely whitish hairy on both surfaces, the surface not visible through the hairs; pods less than 20 mm long (far western Qld)"	"Indigofera leucotricha"
30	"Leaflets variously shaped, green or greyish, hairy or glabrous but if hairy then with at least the upper surface visible through the hairs; pods length variable"	31
31	"Racemes subsessile or peduncles less than 5 mm long"	32
31	"Racemes with peduncles at least 5 mm long"	33
32	"Leaves with (3–) 5–9 (–13) linear to lanceolate leaflets; pods 25–45 mm long and curved up at the tip"	"Indigastrum parviflorum"
32	"Leaves with 11–17 elliptic leaflets; pods 2–17 mm long, straight"	"Indigofera arrecta"
33	"Largest leaflets 4–15 mm long and 1.5–4 mm wide"	34
33	"At least some leaflets either more than 15 mm long or more than 4 mm wide"	37
34	"Flowers 9–12 mm long; pods 25–50 mm long; dense tufts of reddish glands conspicuous between leaflets (north Qld)"	"Indigofera bancroftii"
34	"Flowers 3.5–5 mm long; pods 7–30 mm long; glands between leaflets sparse or absent"	35
35	"Leaflets, stems and pods glabrous or very nearly so; inflorescences 1.5–2.5 cm long, much shorter than the subtending leaves (central Cape York Peninsula only)"	"Indigofera polyclada"
35	"Leaflets, stems and pods hairy; inflorescences 2–29 cm long, shorter or longer than the subtending leaves (widespread)"	36
36	"Leaves with 13–21 oblong-elliptic leaflets that are much paler on the underside (discolorous); pods 7–15 (–30) mm long"	"Indigofera tryonii"
36	"Leaves with (5–) 7–11 (–15) obovate to cuneate leaflets that are slightly paler on the underside (slightly discolorous); pods 15–33 mm long (restricted to sand dunes in western Qld)"	"Indigofera psammophila"
37	"Leaves with 3, 5 or 7 leaflets (sometimes 9)"	38
37	"Leaves with 9 to many leaflets (occasionally 7)"	41
38	"Leaflets glabrous or nearly so, the underside with very sparse appressed hairs; plants drying blackish"	"Indigofera australis subsp. australis"
38	"Leaflets pubescent, the underside with dense appressed hairs; plants not drying black"	39
39	"Leaflets ovate to elliptic; flowers pink; pods distinctly ridged (4-angled) (widespread)"	"Indigofera ewartiana"
39	"Leaflets obovate; flowers red; pods not ridged or angled"	40
40	"Leaflets mostly 5–15 mm long, with a dense tuft of coloured hairs between leaflets; stipules triangular, spreading; flowers 5–6.5 mm long (western Qld)"	"Indigofera erubescens"
40	"Leaflets mostly 9–25 mm long, with few coloured hairs between leaflets; stipules linear-subulate, not spreading; flowers 6–8 mm long (SW Qld)"	"Indigofera georgei"
41	"Leaf rachis with very conspicuous dense tufts of coloured hairs between pairs of leaflets giving the rachis a segmented appearance"	42
41	"Leaf rachis with few of no coloured hairs between the pairs of leaflets"	43
42	"Prostrate perennial; leaflets narrowly elliptic to oblong, rounded and apiculate at apex; stipules subulate, 2–5 mm long (central Cape York Peninsula only)"	"Indigofera wannanii"
42	"Shrub or subshrub; leaflets obovate to cuneate, truncate or emarginate at apex; stipules minute or absent (widespread)"	"Indigofera brevidens"
43	"Leaves and pods densely greyish pubescent; stipules triangular, spreading, often curved, dark brown; flowers 7.5–10 mm long (widespread, variable)"	"Indigofera queenslandica"
43	"Leaves and pods glabrous or sparely appressed hairy; stipules either minute, or subulate and erect, green or pale brown; flowers 4–8 mm long"	44
44	"Multi-stemmed subshrubs to 0.5 m; leaflets 3–19 mm long; pods 14–30 mm long, deflexed or descending"	45
44	"Erect subshrubs usually 1 m or more high; leaflets 10–40 mm long; pods 25–45 mm long, ascending or spreading"	46
45	"Leaflets with fine appressed hairs on upper surface; flowers 5.5–7 mm long; pods 2.5–3.5 mm wide, pubescent (restricted to sand dunes in western Qld)"	"Indigofera psammophila"
45	"Leaflets glabrous or nearly so above; pods 1.5–2.5 mm wide, glabrous (southeast Qld)"	"Indigofera baileyi"
46	"Leaflets broadly elliptic, truncate or broadly rounded at base; flowers 4–5.5 mm long, pale pink; plants drying green (Cape York only)"	"Indigofera elachantha"
46	"Leaflets oblong-elliptic, rounded or cuneate at base; flowers 6–8 mm long, mauve; plants drying blackish (widespread)"	"Indigofera australis subsp. australis"