23G LEQUMINOSAE 



2. STAMEKS DIADELPIlOl S OR MONADELPIIOUS. 



a. Cali/x deeply flipped; stamens 5 long and 5 short, their filaments monadelphons but free at 

 apex; anthers altrrnateh/ larger and smaller. 



Sides of the roundish banner turned or rolled sharply backwards; flowers mostly blue or purple, 

 rarely white, yellow or red, in terminal racemes, mostly in whorls; leaves palmate, of 4 



to many leaflets; seeds without strophiole 11. Lri-iNUS. 



Sides of banner not rolled or bent backward; flowers yellow; seeds with strophiole; introduced 

 shrubs. 



Leaves 3-foliolate, or the branches leafless; calyx herbaceous, divided half-way into 2 lips 



12. Cytisus. 

 Leaves simple, or the branches leafless; calyx membranous, divided nearly to base into 2 lips. 



13. Ulex. 



b. Cahjx not deeply S-lipped. 

 Leaves compound. 



Leaves 3-foliolate, the leaflets commonly denticulate or serrulate; (see also no. 20). 



Flowers in a raceme or spike; corolla deciduous after flowering; leaves pinnately 

 3-foliolate. 



Pod curved or spirally coiled; style subulate 14. Medicago. 



Pod small, ovoid; style filiform 15. Melilotus. 



Flowers in a head, rarely in a capitate umbel or short spike ; corolla withering-persistent 

 after flowering; leaves palmately (rarely pinnately) 3, sometimes 4 or 5-folio- 



late ; pod straight 16. Trifolium. 



Leaves pinnate, the leaflets commonly entire; (leaves simple in some Paroselas, no. 19). 

 Leaves commonly odd-pinnate (two species palmate in Psoralea), the leaflets entire. 



Flowers in umbels, sometimes solitary ; leaflets commonly 3 to many, sometimes 1 



or 2 17. Lotus, 



Flowers in racemes or spikes; leaflets many (few in no. 20 and often few in no. 19). 

 Herbage glutinous or glandular-dotted. 



Pod not prickly ; flowers purple or whitish or rose-color. 



Corolla of 1 petal; shrub 18. Amorpha. 



Corolla of o petals. 



Shrubs, sometimes herbs; deserts 19. Parosela. 



Herbs; Sierra Nevada and Coast Ranges 20. Psoralea. 



Pod prickly, indehiscent; flowers yellowish 21. Glycyrrhiza. 



Herbage not glandular-punctate nor glutinous (viscid in 1 species of no. 24) ; 

 herbs. 



Leaves and upper stipules spinose-tipped 22. Kentrophyta. 



Herbage unarmed. 



Tip of keel obtuse or merely acute 23. Astragalus. 



Tip of keel prolonged into a distinct beak 24. Oxytropis. 



Leaves equally pinnate. 



Tree, spinescent ; two upper calyx-teeth united 25. Olneya. 



Herbs. 



Bachis not produced into a tendril; pods somewhat stipitate, septate between 



the seeds 26. Sesbania. 



Eachis produced into a branched tendril, rarely terminating in a bristle or im- 

 perfect leaflet ; pods not septate between the seeds ; flowers commonly 

 in spikes or racemes. 



Style hairy all around at summit 27.ViciA. 



Style hairy on the upper side 28. Lathyrus. 



Leaves simple; very spiny low shrub 29. Alhagl 



1. CALLIANDRA Benth. 



Herbs or low shrubs with slender branches. Leaves equally bipinnate, with 

 small leaflets. Flowers conspicuous on account of the numerous long-exserted 

 colored stamens, borne in globose heads, the heads terminal on axillary peduncles. 

 Corolla sympetalous, tubular, equally 5-cleft. Stamens monadelphous, inserted 

 on the edge of a disk lining the calyx. Pod linear, with a cord-like border. — 

 Species over 100, tropical and subtropical Americas, a few in India. (Greek 

 kallos, beautiful, and andra, stamen.) 



