4:6 LEGUMINOS2E. (PEA FAMILY.) 



8. H. brachycarpa, Benth. Resembling the last; softly villous; pod vill 

 2-4-seeded. 



9. H. glabra, Torr. Very nearly smooth; stems woody at base, 2 to 8 ft. long, 

 erect or decumbent; leaflets oblong to linear-oblong, 3 to lines long; umbels numerous, 

 Bessile; flowers 3 or 4 lines long; seeds 2. 



10. H. cytisoides, Benth. Resembling the last; peduncles equaling or exceeding 

 the leaves, or sometimes very short, usually with a 1-3-foliolate bract at the top; calyx- 

 teeth attenuate, mostly recurved, 



11. H. jtmcea, Benth. Somewhat shrubby, erect; leaflets obovate to oblong, 2 to 

 4 lines long; umbels on very short peduncles or sessile; flowers about 3 lines long; calyx 

 2 lines long or less; teeth short and blunt. 



. 12. . H. tomentosa, Hook & Arn. Very pubescent, weak and flexuose, prostrate or 

 ascending, a foot or more long; leaflets 5 to 7, cuneate-oblong to obovate, acute, 3 to G 

 lines long; umbels on short bracteolate peduncles, or the uppermost sessile; flowers 3 or 4 

 lines long; alyx half as long or more, very villous. 



13. H. Heermannii, Durand & Hilgard. Less pubescent, much branched and 

 spreading; leaflets smaller; flowers smaller. 



8. PSORALEA, L. 



Calyx lobes nearly equal, or the lower one longer; the two upper often connate. Keel 

 broad and obtuse above, united with the wings. Stamens diadelphous or monadelphous. 

 Pod ovate, indehiscent, 1 -seeded, thick, sessile. Perennial herbs punctate with dark 

 glandular dots. Leaves pinnately 3-foiiolate. Stipules free. 



* Stems prostrate, creeping; leaves orbicular. 



1. P. orbicularis, Lindl. Petioles 6 to 12 inches long; the leaflets 2 to 4 inches 

 across, slightly cuneate at the base; peduncles equaling or exceeding the leaves, bearing 

 a close villous spike of large flowers; the lower tooth of the calyx much the longest and 

 about equaling the purplish corolla; stamens diadelphous. 



* * Stems erect. 



2. P. strobilina, Hook & Arn. Two or three feet high; petioles 3 or 4 inches 

 long; leaflets rombic ovate, softly pubescent beneath, about 2 inches long; stipules large, 

 membranaceous; flowers in short oblong spikes, smaller than the last; stamens monadel- 

 phous. 



3. P. macrostachya, DC. .Three to even twelve feet high; leaflets ovate-lance- 

 olate, an inch or two long or more; peduncles much exceeding the leaves; spikes cylin- 

 drical, silky villous, the hairs often blackish; the lower tooth of the calyx but little tno 

 longest, scarcely eqiialing the purple petals; tenth stamen nearly free. 



4. P. pliysod.es, Dougl. A foot or two high, nearly smooth, slender; leaflets 



