234 LEGUMINOS.E. Hosackia. 



Annuals, low : flowers smaller. 



Umbels 2 -5-flowered : standard remote from the wings : leaflets 5. 10. H. maritima. 



Flowers mostly solitary : petals approximate ; keel obtuse ; standard 



attenuate below : leaflets 5 to 9. 11. H. stkigosa. 



Flowers very small, solitary : keel acute : blade of the standard cor- 

 date : leaflets 3 to 5 : pod 5-7-seeded : nearly glabrous. 12. H. parvifloka. 



* * Pod shortly acute, 3 - 7-seeded, straight : flowers small, mostly solitary : keel narrowed into 



an acute beak : stipules gland-like : annuals, more or less villous. 



Flowers peduncled : corolla scarcely exceeding the calyx : leaves nearly 



sessile, 1 - 3-foliolate. ' 13. H. Purshiana. 



Flowers nearly sessile, not bracteate : corolla longer : leaves petioled, 

 3 - 5-foliolate : low. 

 Calyx-teeth about equalling the tube : pod 6 to 9 lines long, 5-seeded. 14. H. subpinnata. 

 Teeth much longer than the tube : pod 3 to 4 lines long, 2 - 4-seeded. 15. H. brachycarpa. 



* * * Pod long-attenuate upward, subterete, incurved, pubescent : stipules gland-like : leaflets 3 



to 7 : seeds 1 or 2, terete : peduncles short or none : flowers and fruit reflexed. 



Glabrous or sparingly pubescent : pod slightly pubescent, elongated and 

 much exserted beyond the calyx : calyx- teeth much shorter than 

 the tube. 

 Somewhat woody : nearly glabrous : stems angled : leaflets mostly 3. 



Leaflets oblong to linear : umbels sessile : teeth naiTow, erect. 16. H. GLABRA. 



Leaflets oblong to linear : peduncles short or nearly wanting : teeth 



attenuate, usually recurved. 17. H. cytisoides. 



Leaflets obovate to oblong : peduncles very short : teeth short and 



blunt. 18. H. JUNCEA. 



Herbaceous, sparingly pubescent : stems very slender, terete : leaflets 

 usually 5 to 7 : calyx -teeth short. 

 Peduncles slender : flowers 2 or 3 lines long : style glabrous. 19. H. prostrata. 



Peduncles very short : flowers very small : style pubescent. 20. H. micrantha. 



Very silky-pubescent or tomentose : stems herbaceous, terete : pod pubes- 

 cent, shorter. 

 Pubescence appressed. 



Densely white-silky : leaflets mostly 3, narrow : umbels loosely few- 

 flowered, often sessile : flowers 3 lines long : calyx-teeth short. 21. H. sericea. 

 Leaflets 5 to 7 : umbels peduncled : flowers usually larger : calyx- 

 teeth nearly equalling the tube. 

 More or less silky : umbels close, capitate : calyx very silky. 22. H. argophylla. 



Villous and subtomentose : umbels less dense : calyx less hairy. 23. H. uecumbens. 

 Pubescence more or less spreading : pod very short : umbels mostly 

 on short peduncles : leaflets 5 to 7 : calyx- teeth filiform, equal- 

 ling the tube. 

 Very pubescent throughout : flowers 3 or 4 lines long. 24. H. tomentosa. 



Less pubescent ; stem glabrous : flowers smaller. 25. H. Heermanni. 



§ 1. Pod acute above, linear, straight or nearly so, terete or somewhat compressed, 

 many- (5 - 2Qi-)seeded, glabrous excej^t in H. rigida : seeds mostly compressed, 

 suborbicidar : keel broad above^ mostly very obtuse : floioers and fruit ascend- 

 ing or erect. — Euhosackia, Benth. 



* Stipules scarious or foliaceous : leaflets 5 to 21, upon a more or less elongated rha- 

 chis : tmibels pedunctdate, few - viany-flotvered : flowers rather large : perennials. 



+■ Stipules h'oad and foliaceous : bract of several leaflets, below the top of the peduncle. 



1. H. incana, Torr. Low, stout, erect, densely silky-villous throughout : leaflets 

 9-15, obovate-oblong, acute, nearly half an inch long; stipules ovate: peduncles 

 shorter than the leaf (half an inch long), 6 - 9-flowered : bract near the top, 5-folio- 

 late : calyx 3 lines long ; the subulate teeth half the length of the tube. — Pacif. R. 

 Eep. iv. 79, t. 4. 



On dry hills near South Yuba, Bigelov\ 



2. H. stipularis, Benth. Rather tall, stout, two feet high or more, less densely 

 villous with spreading hairs, glandular, the leaves smoother: leaflets usually 15 to 21, 



