538 FABACEAE 



shorter than the tube, the lower exceeding it; corolla red-purple, 5-6 mm. long, standard much 

 inflated in age. 



Grassy hillsides and plains, Upper Sonoran Zone; California, Butte County and the North Coast Ranges to 

 San Diego. Type locality: Santa Catalina Island. March-May. 



54. Trifolium depauperatum Desv. Dwarf Sack Clover. Fig. 2709. 



Trifolium depauperatum Desv. Journ. Bot. 4: 69. 1814. 



Dwarf, annual, the branches decumbent, 5-10 cm. long. Leaflets 1-2 cm. long, cuneate- 

 oblong, obtuse or retuse, denticulate ; peduncles elongated, very slender ; heads small, few-flow- 

 ered ; involucre reduced to a mere ring ; calyx-tube very short, the teeth decidedly unequal ; 

 corolla red-purple, 7-9 mm. long, inflated in age ; pod 1-2-seeded. 



Moist clay or adobe soil, Upper Sonoran Zone; Humboldt County, and north Sacramento Valley to central 

 California; also in Chile. Type locality: "western coasts of both North and South America." April-May. 



Trifolium fragiferum L. Sp. PI. 772. 1753. Perennial, stems prostrate. Leaves rather long-petioled; 

 leaflets obovate, 10-15 mm. long, glabrous; peduncles 6-9 cm. long, slightly exceeding the leaves; heads round- 

 ovoid, 12-14 mm. long in flower; flowers pink; calyces inflated and reflexed in fruit and heads becoming 20 mm. 

 long. Locally established in moist meadows in eastern Washington (Grandview) and eastern Oregon (Hermiston). 

 Native of Europe. 



9. HOSACKIA Dougl. ex Benth. Bot. Reg. 15: pi. 1257. 1829. 



Perennial or annual herbs with pinnately 1- to several-foliolate leaves. Stipules 

 scarious, rarely herbaceous or reduced to a gland. Flowers axillary, umbellate or solitary, 

 sessile or on short often bracteate peduncles, yellow or reddish. Calyx-teeth 5, nearly 

 equal, keel incurved, blunt to acute or rarely beaked. Stamens diadelphous, free from the 

 petals. Ovary sessile; ovules 1 to several. Pod linear, nearly terete or compressed, 2- 

 valved or indehiscent. [Name in honor of David Hosack, 1769-1835, professor of botany, 

 Columbia College.] 



A North American genus of about 50 species, all but two of which are restricted to western North America. 

 Type species, Hosackia bicolor Dougl. 



Stipules membranous or herbaceous. I. Euhosackia. 



Stipules reduced to a usually black gland. 



Pods dehiscent, abruptly short-beaked, straight or nearly so. 



Keel not prolonged into an incurved beak (H. parviflora excepted) ; pods not reflexed. 



II. Anisolotus. 



Keel prolonged into an incurved beak; leaflets 3, the terminal petiolulate, the 2 lateral sessile and borne 

 at the base of the leaf; pod reflexed. III. Acmispon. 



Pods indehiscent, tapering to an elongated beak, often arcuate and reflexed. IV. Syrmatium. 



Subgenus I. Euhosackia. 



Pods linear-oblong, 3-5 mm. wide; bracts distant from the umbel or sometimes subtending it in incana, usually 

 3— 5 -pinnate. 



Plants hoary with a dense silky-villous pubescence; calyx-teeth subulate, 2—3 mm. long. 



1. H. incana. 



Plants green, glabrate or more or less pubescent, calyx-teeth triangular, 1-1 . 5 mm. long. 



Stipules herbaceous, auriculate. 2. H. stipularis. 



Stipules membranaceous, ovate to lanceolate, not auriculate, glabrate or sparsely pubescent. 



Leaflets oblong-obovate, bright green above, pale beneath; standard purple, wings yellow, or the 

 petals and calyx all rose-purple. 3. H. rosea. 



Leaflets broadly obovate, light glaucous green on both surfaces; petals greenish yellow, the standard 

 tinged or veined with purple. 4. H. crassifolia. 



Pods linear, less than 3 mm. wide; bracts 1-3-foliolate, subtending the umbel, rarely wanting. 



Plants glabrous or nearly so; claws of petals well exserted, those of the keel longer than the blades. 



Bracts usually none; flowers yellow and white. 5. H. pinnata. 



Bracts present, 1-3-foliolate; standard yellow, wings rose-colored, keel purple at tip. 



6. H. gracilis. 



Plants pubescent or glabrous; claws of petals scarcely exserted beyond the calyx, those of the keel shorter 

 than the blades. 

 Plants more or less pubescent, erect or ascending; flowers mostly over 10 mm. long. 



Leaflets obovate or oblong-ovate, or the uppermost narrower; standard yellow, wings and keel 

 white. 7. H. Torreyi. 



Leaflets oblong to linear, acute at both ends; petals yellow, tinged with purple in age. 



8. H. oblongifolia. 



Plants glabrous, prostrate; flowers 1-3 in the umbel, 5-7 mm. long. 9. H. cuprea. 



Subgenus II. Anisolotus. 



Perennials; standard attenuate into the short claw; stigma subtended by a band of hairs. 

 Leaf-rachis elongated, 2-5 cm. long. 



Stems strigose. 10. H. grandiflora. 



Stems villous, with spreading hairs. 11. H. leucophaea. 



Leaf-rachis short, 1 cm. long or less. 



Plants erect, broom-like; peduncles stout, 6-12 cm. long; seeds granulose. 12. H. rigida. 



Plants prostrate to ascending, the internodes short; peduncles slender, 0.5-4 cm. long; seeds smooth. 



Leaflets canescent, strigose, linear-oblong. 13. H. Wrightii multicaulis. 



Leaflets silvery with a dense silky pubescence, cuneate-obovate. 14. H. argyraea. 



