196 FAB ACE AE. 



10. T. microcephalum Pursh. Annual; slender, much branched, 

 decumbent, soft pubescent; stipules ovate-acuminate, nearly entire; 

 leaflets obovate-cuneiform or obcordate, denticulate; heads small, 

 subglobose, many-flowered, on slender peduncles; involucre many- 

 clett, the segments entire; calyx-teeth subulate, broad, scarious and 

 sometimes toothed at base; corolla minute, pinkish; pod globose, 

 1-seeded. 



Common in the foothills and mountains in open places. April- 

 August. 



11. T. furcatum Lindl. Usually stout and fistulose, branching 

 from near the base, decumbent, 3-6 dm. long; herbage light green, 

 glabrous and somewhat succulent; stipules large, membranous, 

 nearly or quite entire; leaflets 1-3 cm. long, broadly obovate, obtuse 

 or retuse, dentate or spinulose-denticulate; peduncles stout, much 

 exceeding the leaves; involucral bracts connate at base, ovate- 

 lanceolate, acuminate, scarious-margined, heads hemispheric, 2-4 

 cm. broad; calyx-teeth short, entire and unequal; corolla 1-2 cm. 

 long, ochroleucous or somewhat reddish tinged; pod stipitate, 3-8- 

 seeded; seed rounded, minutely granulate. 



Occasional on grassy hillsides in rather heavy soil. Elysian Park, 

 Davidson; Chatsworth Park. 



12. T. stenophyllum Nutt. Difi'use annual with slender stems 

 and branches, often purplish, decumbent or ascending, 1-3 dm. 

 long; leaflets linear, remotely serrate-toothed; peduncles filiform, 

 much longer than the leaves; segments of the involucre oblong, 

 cuneate at the base; head small, hemispheric; corolla purple, inflated 

 from a narrow base to a broad, almost truncate apex; pod 2-seeded; 

 seeds obliquely heart-shaped, strongly rugose. 



Frequent on grassy slopes. March. 



13. T. depauperatum Desv. Low, diffuse, glabrous, annual, 

 branching from the base, decumbent, flaccid, 6-15 cm. long, few- 

 leafed; leaflets 1 cm. long, cuneate-oblong, obtuse or emarginate, 

 denticulate; head long-peduncled, few-flowered; involucre much 

 reduced, with truncate short lobes; corolla less inflated, not at all 

 truncate at apex; pod 1-2-seeded; seeds somewhat angular, tubercu- 

 late-rugose. 



Same range as the last and much resembling it, but easily dis- 

 tinguished by the involucres. 



7. HOSACKIA Dougl. 



Annual or perennial herbs with pinnately 3-many 

 foliate leaves, and minute gland-like or scarious stipules. 

 Flowers solitary or umbellate, naked or subtended by 

 1-5-folIate bracts, sessile or on axillary peduncles. 

 Calyx about equally 5-toothed or 5-cleft. Petals free 

 from the stamens, nearly equal; standard ovate or 

 rounded, the claw often remote from the others; wings 

 obovate or oblong; keel slightly Incurved, obtuse or 



