PEA FAMILY 539 



Annuals. 



Keel blunt, not beaked. 



Styles hairy at the base of the stigma; pods strigose; seeds not smooth. 



Seeds quadrate, rugose and tuberculate or granulose. 15. H. strigosa. 



Seeds subglobose, granulose but not rugose. 16. H. tomentella. 



Styles glabrous; seeds smooth. 



Flowers pedunculate; seeds ovoid or rounded, the sides turgid. 



Corolla 7-8 mm. long; keel shorter than the other petals. 17. H. maritima. 



Corolla 4— S mm. long; keel longer than the other petals. 18. H. humilis. 



Flowers subsessile; seeds irregularly flattened toward the edges, with a raised knob-like center on 

 one or both sides. 

 Corolla cream-colored, tinged with reddish purple; plants erect, more or less glabrate. 



19. H. denticulata. 

 Corolla yellow, tinged with reddish purple; plants prostrate or decumbent. 



Pods 10-15 mm. long; calyx-lobes about equaling the tube. 20. H. subpinnata. 

 Pods 5-10 mm. long; calyx-lobes twice as long as the tube. 21. H. brachycarpa. 

 Keel acutely beaked; leaf-rachis not dilated; flowers solitary, cream-colored and reddish or pink. 



22. H. parviflora. 



Subgenus III. Acmispon. 



Flowers white or pinkish, solitary in the axils on a slender 1-bracted peduncle. 23. H. americana. 



Subgenus IV. Syrmatium. 



Body of the pod little exserted beyond the calyx, often arcuate or the beak recurved; leaflets commonly 5 (3-5). 

 Stems at least when young villous-tomentose with spreading hairs. 24. H. tomentosa. 



Stems strigose or silvery-silky-pubescent. 



Plants glabrous or more or less canescent but not densely silvery-silky. 



Calyx-teeth triangular-subulate, scarcely 1 mm. long; leaflets glabrous or sparsely strigose. 



25. H. juncea. 

 Calyx-teeth narrowly subulate, 2-3 mm. long, villous. 



Corolla 10-12 mm. long; calyx-lobes as long as the tube; leaflets loosely villous-tomentose. 



26. H. decumbens. 



Corolla 7-8 mm. long; calyx-lobes half the length of the tube; leaflets with short appressed 

 curved hairs. 27. H. nevadensis. 



Plants densely silvery-silky throughout. 



Flowers 7-8 mm. long; claw of the standard much shorter than the blade. 

 Blade of the standard reflexed or at right angles to the broad claw. 



28. H. sulphured. 

 Blade of the standard only slightly ascending; claw slender. 29. H. argophylla. 



Flowers 10-12 mm. long; claw of the standard slender, equaling or exceeding the blade. 



Calyx-teeth 2.5 mm. long; corolla well exceeding the calyx; umbels long-peduncled or 

 sometimes subsessile. 30. H. ornithopus. 



Calyx-teeth 3.5 mm. long; corolla little exceeding the calyx; umbels subsessile. 



Stem and leaves with short closely appressed pubescence. 31. H. Fremontii. 



Stem and leaves densely silvery-silky but the hairs longer and somewhat spreading. 



32. H. nivea. 

 Body of the pod well exserted beyond the calyx, straight or somewhat curved. 



Annuals; pods long and slender, more or less constricted between the seeds. 



Umbels on slender peduncles; flowers 5-7 mm. long. 33. H. prostrata. 



Umbels sessile or subsessile; flowers 3-4.5 mm. long. 34. H. micrantha. 



Perennials. 



Umbels peduncled, usually bractless, but bearing 1 or more black glands at the apex of the peduncle. 



Flowers several in the umbel. 



Calyx-lobes subulate-setaceous, weak and often recurved; plants mostly prostrate, not shrubby. 



35. H. cystoides. 



Calyx-lobes short and stiffly erect, triangular to triangular-subulate. 

 Flowers solitary or rarely 2. 

 Umbels sessile; calyx -lobes subulate. 



Plants green and glabrous or sparsely strigose. 



Plants pallid and silvery-silky. 



1. Hosackia incana Torr. Woolly Hosackia. Fig. 2710. 



Hosackia incana Torr. Pacif. R. Rep. 4: 79. pi. 4. 1857. 

 Lotus incanus Greene, Pittonia 2: 147. 1890. 



Perennial, erect, 15-45 cm. high, canescent with a dense short villous or almost silky tomen- 

 tum. Leaflets 5-15, usually 7 or 9, elliptic to obovate, 7-15 mm. long; stipules ovate, scarious; 

 peduncles 1 . 5-3 cm. long, scarcely equaling the leaves ; bract closely subtending the umbel or 

 often distant, commonly 3-f oliolate and petiolulate, stipulate ; umbels few- to many-flowered ; 

 calyx-tube cylindric, the teeth subulate, scarcely half the length of the tube; corolla about 15 mm. 

 long, the claws exserted beyond the calyx ; claw of the standard remote from the others ; wings 

 longer than the obtuse keel; pods 15-40 mm. long, 3-4 mm. broad; seeds ovoid, smooth, mottled. 



Open coniferous forests, Arid Transition Zone; western slopes of the Sierra Nevada, from Butte County to 

 Placer County, California. Type locality: dry hillsides, near South Yuba. May-June. 



2. Hosackia stipularis Benth. Stipulate Hosackia. Fig. 2711. 



Hosackia stipularis Benth. Trans. Linn. Soc. 17: 365. 1837. 

 Hosackia macrophylla Kell. Proc. Calif. Acad. 2: 123. 1861. 

 Lotus stipularis Greene, Pittonia 2: 147. 1890. 



Stems usually several from a perennial root, ascending or erect, simple or with a few 



