1	"Shrub to tree"	2
1	"Annual, biennial, perennial herb, vine, subshrub"	18
2	"Plant generally armed with prickles, spines, or thorns"	3
2	"Plant unarmed"	9
3	"Leaves simple, sometimes small or falling early"	4
3	"Leaves all or mostly compound, generally persistent"	6
4	"Plant gland-dotted; corolla indigo blue to pink-purple; seed 1"	Psorothamnus
4	"Plant not gland-dotted; corolla yellow to +- red; seeds (1)2--several"	5
5	"Corolla red-purple; fruit narrowed between seeds, glabrous"	"Alhagi {Alhagi maurorum}"
5	"Corolla yellow; fruit not narrowed between seeds, densely hairy"	"Ulex {Ulex europaeus}"
6	"Leaf simple or palmately compound; all filaments free"	Pickeringia
6	"Leaf pinnately compound; all or 9 filaments fused"	7
7	"Plant gland-dotted; fruit indehiscent; seed 1"	Psorothamnus
7	"Plant not gland-dotted; fruit dehiscent (sometimes slowly so); seeds generally several"	8
8	"Leaf even-pinnate; corolla wings purple-pink suffused with white, banner, keel yellow-white to pink or purple; fruit not flat, generally narrowed between seeds"	"Olneya {Olneya tesota}"
8	"Leaf odd-pinnate; corolla white or pink; fruit flat, not narrowed between seeds"	Robinia
9	"Petal 1 (the banner) --- inflorescence spike-like; fruit indehiscent; seed 1"	Amorpha
9	"Petals 5"	10
10	"Filaments all fused; leaves simple or ternately or palmately compound"	11
10	"Filaments all free or 9 fused, 1 (uppermost) free or 0; leaves generally odd-pinnately compound (or leaflet number, arrangement generally irregular, as sometimes in <i>Acmispon</i>)"	14
11	"Leaves simple, < 2.5 cm; stems generally +- leafless"	"Spartium {Spartium junceum}"
11	"Leaves simple or generally compound, generally > 2.5 cm; stems leafy"	12
12	"Leaf of 3--17 leaflets, palmately compound; corolla blue, purple, white, or yellow, banner glabrous to densely hairy, keel generally beaked"	Lupinus
12	"Leaf of 1--3 leaflets, appearing simple or not; corolla yellow or white, banner generally glabrous, keel obtuse"	13
13	"Style generally abruptly curved at +- middle or gently curved +- throughout; upper lip of calyx +- 2-lobed"	Cytisus
13	"Style +- abruptly bent at tip; upper lip of calyx 2-lobed"	Genista
14	"Inflorescence generally an umbel or flowers 1--2; corolla generally yellow"	Acmispon
14	"Inflorescence a raceme; corolla yellow or not"	15
15	"Corolla yellow with dark marks; fruit papery, inflated"	"Colutea {Colutea arborescens}"
15	"Corolla white or pink to purple; fruit not papery, not inflated"	16
16	"Flower 6--10 mm; plant gland-dotted; fruit indehiscent; seed 1 (see also <i>Marina</i>)"	Psorothamnus
16	"Flower 14--25 mm; plant not gland-dotted; fruit dehiscent or not; seeds several"	17
17	"Fruit dehiscent, flat, not narrowed between seeds; filaments 9 fused, 1 free; corolla +- white to pink"	Robinia
17	"Fruit indehiscent, not flat, +- narrowed between seeds; filaments all free; corolla +- blue-purple"	"Calia secundiflora"
18	"Leaflets 0, but stipules leaflet-like --- leaf axis ending as a tendril"	"Lathyrus aphaca"
18	"Leaflets 2--many"	19
19	"Leaf palmately compound, leaflets generally 3--9"	20
19	"Leaf pinnately to subpalmately compound (axis apparent beyond lowermost leaflets), leaflets 2--many"	26
20	"All filaments free; corolla yellow, 15--25 mm"	Thermopsis
20	"All or 9 filaments fused; corolla not yellow or, if so, generally < 15 mm"	21
21	"Leaflets gland-dotted; fruit indehiscent or transversely dehiscent; seed 1"	22
21	"Leaflets not gland-dotted; fruit indehiscent or dehiscent through longitudinal sutures; seeds generally several"	23
22	"Leaves +- basal or clustered near stem tips; leaflets elliptic to oblanceolate or widely obovate; fruit included in calyx except for beak"	Pediomelum
22	"Leaves cauline; leaflets obovate to linear; fruit exserted from calyx"	"Ladeania {Ladeania lanceolata}"
23	"Filaments of all stamens fused; leaflets generally 5--9, entire"	Lupinus
23	"Filaments of 9 stamens fused, the 10th (uppermost) free; leaflets 3--5, entire, toothed, or wavy"	24
24	"Leaflets 3--9, lower 2 in stipular position or not, others +- palmately arranged, stipules gland-like, reduced to bumps, or inconspicuous, inflorescence an umbel or 1--3-flowered, corolla generally yellow (see also <i>Acmispon</i>)"	Lotus
24	"Leaflets generally 3, lower 2 not in stipular position, stipules generally papery or membranous, not reduced to bumps, not inconspicuous, rarely leaflet-like, if so then inflorescence not an umbel and corolla not yellow"	25
25	"Leaflet entire; fruit not enclosed in corolla"	Astragalus
25	"Leaflet +- toothed or wavy; fruit generally enclosed in corolla"	Trifolium
26	"Leaflets 2; main leaf axis ending as tendril or bristle"	Lathyrus
26	"Leaflets >= 3; main leaf axis ending as leaflet, tendril, or bristle"	27
27	"Leaflets 3; fruit generally indehiscent (generally dehiscent in <i>Phaseolus</i>)"	28
27	"Leaflets > 3 on all or most leaves; fruit dehiscent or not"	37
28	"Keel petals spirally coiled; leaflet generally lobed --- trailing or twining vine"	"Phaseolus {Phaseolus filiformis}"
28	"Keel petals not spirally coiled; leaflet entire, toothed, or wavy"	29
29	"Leaflet toothed or wavy --- fruit ovate or reniform, generally 1-seeded, or +- coiled, several-seeded"	30
29	"Leaflet not toothed, not wavy"	33
30	"Corolla persistent, enclosing fruit, yellow, 3.5--5 mm"	Trifolium
30	"Corolla deciduous, yellow or not, 3.5--5 mm or not"	31
31	"Fruit spirally coiled (or sickle-shaped or straight), generally prickly; seeds 1--several"	Medicago
31	"Fruit not spirally coiled, not prickly; seeds 1--2"	32
32	"Fruit reniform, ridges generally net-like; corolla 2--3 mm"	Medicago
32	"Fruit ovate, ridges transverse to finely net-like; corolla 2.5--7 mm"	Melilotus
33	"Plant not gland-dotted; seeds generally 2--several; fruit exserted from calyx or included except for beak"	34
33	"Plant +- gland-dotted; seed 1; fruit generally included in calyx except for beak"	35
34	"Inflorescence an umbel; fruit exserted from calyx or included except for beak"	Acmispon
34	"Inflorescence a raceme; fruit exserted from calyx"	Astragalus
35	"Corolla cream to yellow; calyx conspicuously swollen in fruit"	Rupertia
35	"Corolla at least partly blue to purple; calyx swollen or not in fruit"	36
36	"Calyx swollen in fruit; bracts at each node, especially lower, of inflorescence united into fan-shaped, 3--5 toothed blade"	"Bituminaria {Bituminaria bituminosa}"
36	"Calyx not (or only +-) swollen in fruit; bracts at nodes of inflorescence not united"	Hoita
37	"Leaf even-pinnate, main axis ending as a bristle or tendril or not"	38
37	"Leaf odd-pinnate, main axis ending as a leaflet"	41
38	"Leaflets +- 20--60; fruit 4--8 cm or 15--20 cm; plant annual, shrub, small tree"	Sesbania
38	"Leaflets < 30; fruit generally < 8 cm; plant annual, perennial herb"	39
39	"Stipules leaflet-like, often > leaflets; style longitudinally folded; leaflets 4--6, glabrous"	"Pisum {Pisum sativum}"
39	"Stipules generally not leaflet-like but sometimes +- = leaflets; style not longitudinally folded; leaflets 4--many, hairy or glabrous"	40
40	"Style +- flat, puberulent near +- middle for +- 1/3--1/2 length adaxially; leaflets +- rolled in bud"	Lathyrus
40	"Style generally not +- flat, puberulent at tip, all around or especially abaxially; leaflets folded in bud"	Vicia
41	"Corolla wings << keel; leaflets adaxially finely red-dotted; fruit 1-seeded, leathery, strongly net-ridged"	"Onobrychis {Onobrychis viciifolia}"
41	"Corolla wings +- = keel; leaflets adaxially dark gland-dotted or not, not red-dotted; fruit not simultaneously 1-seeded, leathery, and strongly net-ridged"	42
42	"Plant gland-dotted on stems, leaflets, or both; fruit indehiscent"	43
42	"Plant not obviously gland-dotted; fruit dehiscent or not"	48
43	"Fruit several-seeded, long-exserted from calyx, glabrous or with bristles or prickles; leaflets 6--10 mm wide"	Glycyrrhiza
43	"Fruit 1-seeded, included in calyx, glandular; leaflets generally < 6 mm wide"	44
44	"Petals from receptacle; stamens 10; inflorescence head-like or not"	Psorothamnus
44	"Petals, except banner, from side or top of column of fused filaments; stamens 5 or 9--10; inflorescence not head-like"	45
45	"Plant prostrate to decumbent"	46
45	"Plant ascending to erect"	47
46	"Stem gland-dotted"	Dalea
46	"Stem not gland-dotted"	Marina
47	"Inflorescence a dense spike; stamens 5"	Dalea
47	"Inflorescence an open raceme; stamens 9--10"	Marina
48	"Flowers 1--2 or several to many in umbel"	49
48	"Flowers (1--2 or) many in spike to raceme that is head-like or not"	51
49	"Stipules gland-like, often not apparent; fruit exserted or not, ovate to oblong"	Acmispon
49	"Stipules conspicuous, scarious or leaflet-like; fruit exserted, generally linear to lanceolate"	50
50	"Inflorescence generally 10--20-flowered umbel; fruit indehiscent, segments 1--12"	Coronilla
50	"Inflorescence several-flowered umbel or 1--2-flowered; fruit dehiscent, segments 0"	Hosackia
51	"Seed 1; leaflet tip with gland; inflorescence a spike, dense, +- 1 cm"	Marina
51	"Seeds several; leaflet tip without gland; inflorescence a spike or raceme, dense or not, generally > 1 cm"	52
52	"Fruit indehiscent, breaking into 1-seeded segments; corolla 6--9 mm; leaflet generally < 6 mm"	Ornithopus
52	"Fruit generally dehiscent (sometimes slowly so), not breaking into 1-seeded segments; corolla often > 9 mm; leaflet often > 6 mm"	53
53	"Style tip or stigma finely hairy; stipules spiny, free"	"Peteria {Peteria thompsoniae}"
53	"Style tip and stigma glabrous; stipules not spiny, free or fused"	54
54	"Keel tip rounded to acute (or short-beaked); fruit 1-chambered, if +- 2-chambered then septum from lower suture, rarely fusing with narrow flange from upper suture"	Astragalus
54	"Keel tip beaked; fruit +- 2-chambered, septum from upper suture, partial to complete"	Oxytropis