214 Leguminosae 



spinulose-serrate ; involucre laciniate, shorter than the 3-15-flow- 

 ered heads; calyx-tube 15-nerved; teeth broadly subulate, taper- 

 ing to a setaceous point, longer than the tube; corolla exceed- 

 ing the calyx, purple and whitish-tipped. 



Frequent in grassy openings in the San Gabriel and San Bernardino 

 Mountains, confined mostly to the pine belt. 



10. T. tridentatum Lindl. Annual; erect, 2-4 dm. high, gla- 

 brous ; stipules setaceously laciniate ; leaflets linear or lanceolate, 

 sharply serrate, 2-6 cm. long; head 2-3 cm. broad; involucre 

 laciniate, much shorter than the flowers ; flowers about 1 cm. long, 

 bright purple with darker center ; tip of standard sometimes 

 whitish; calyx-tube 10-nerved; the teeth rigid, broad at base, 

 abruptly narrowed to a subulates pinulose-tipped apex which 

 is usually subtended by a short stout tooth on each side. 



Frequent on the plains and grassy hillsides. Very variable as to foliage. 

 March-April. 



11. T. obtusiflorum Hook. Annual; stems stout, erect, flex- 

 uose. purple, with ascending branches; leaves dull green, soft 

 pubescent throughout and very clammy, acidulous; stipules 

 spreading or reflexed; leaflets 2-3 cm. long, linear-lanceolate, 

 pectinately setulose; heads 2-3 cm. broad on long peduncles; 

 calyx-tube with 10 prominent and as many lesser nerves ; corolla 

 whitish with a dark purple center. (T. roscidum Greene.) 



Occasional on moist shady slopes and along streams in all our mountains, 

 confined mostly to the chaparral belt. 



**** Involucre cup-shaped. 



12. T. microcephalmn Pursh. Annual ; slender, much branch- 

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

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

 small, subglobose, many-flowered, on slender peduncles; involu- 

 cre many-cleft, 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. 



- -*- Flowers becoming inflated. 



13. T. furcatum Lindl. Usually stout and fistulose, branch- 

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

 green, glabrous and somewhat succulent; stipules large, mem- 



