69 
B. Stamens monadelphous or diadelphous (9 and 1, rarely 5 and 5), nearly distinct 
in Amorpha. 
“ Anthers of two forms: stamens monadelphous: leaves digitate and leaflets entire. 
3. Crotalaria. Calyx 5-lobed: pod inflated: leaves 3-foliolate or simple: flowers 
yellow. . 
4. Lupinus. Calyx deeply 2-lipped: pod flat: leaves 5 or 7-foliolate: flowers 
blue or purple. 
**Anthers uniform (except in Psoralea and Zornia). 
+ Leaves palmately or pinnately 3-foliolate ; leaflets denticulate or serrulate: sta- 
mens diadelphous: pods small, 1 to few-seeded, often inclosed in the calyx or 
curved or coiled. 
5. Medicago. Flowersracemed or spiked: pods curved or coiled, 1 to few-seeded. 
6. Melilotus. Flowers racemed : pods coriaceous, wrinkled, 1 or 2-seeded. 
7. Trifolium. Flowers capitate: pods membranaceous, 1 to 6-seeded: petals ad- 
herent to the stamen-tube, 
+ + Leaves unequally pinnate (or palmate in Psoralea and some Daleas): pod not 
jointed: not twining or climbing (except Wistaria). 
++ Flowers solitary or few on axillary peduncles. 
8. Hosackia. Leaves 1 to 5-foliolate: peduncle leafy-bracteate: pod linear, 
++ + Flowers in spikes, racemes, or heads, 
= Herbage glandular-dotted: stamens mostly monadelphous : pod small, indehis- 
cent, mostly 1-seeded. 
9. Psoralea. Corolla truly papilionaceous: stamens 10, half of the anthers often 
smaller or less perfect: leaves most] y palmately 3 to 5-foliolate. 
10. Eysenhardtia. Corolla scarcely at all papilionaceous, petals all free and of 
nearly equal length: stamens 10, diadelphous (9 and 1): pod more or less falcate. 
11. Amorpha. Corolla of one petal: stamens 10, monadelphous at base. 
12, Dalea. Corolla imperfectly papilionaceous: stamens 9 or 10, the cleft tube of 
filaments bearing 4 of the petals about its middle. 
13. Petalostemon. Corolla scarcely at all papilionaceous: stamens 5, the cleft 
tube of filaments bearing 4 of the petals on its summit. 
= = Herbage not glandular-dotted (except in Glycyrrhiza): stamens mostly dia- 
delphous: pod 2-valved, several-seeded: flowers racemose, 
a, Hoary perennial herbs: wings cohering with the keel: pod flat or 4-angled. 
14, Tephrosia. Standard broad: pod flat: leaflets veiny. 
15. Indigofera. Calyx and standard small: pod more or less 4-angled: leaflets 
obscurely veined. 
b. Trees, shrubs, or woody twiners: wings free; standard broad. 
16. Brongniartia. Erect shrubs, with numerous smail leaflets and herbaceous 
stipules but no stipels: flowers solitary and axillary: pod flat. 
17. Peteria. Shrubby and rigid branching, with numerous very minute leaflets 
and small spiny stipules but no stipels: racemes terminal or opposite the leaves : 
pod flat. 
18. Robinia. Trees or shrubs: leaflets stipellate: pod flat, thin, margined on 
one edge, 
19, Coursetia. Trees or shrubs: leaflets obscurely stipellate: pod linear, flat, 
not margined. 
20. Wistaria. Woody twiners: leaflets obscurely stipellate: pod swollen, mar- 
ginless. 
¢. Smooth herbs or shrubby : standard broad, spreading or reflexed: pod flat, 4- 
angled, or 4-winged, 
