im:a family. 



307 



Var. argillorum. Depauperate; heads about \ in. high, the teeth 

 less silky and relatively shorter. — Hills and mountain slopes of the 

 North Coast Ranges, seemingly joining with no. 4. 



Var. olivaceum (T. olivaceum Greene). Mostly erect, 1 to If ft. 

 high, slightly pubescent; leaflets cuneate-obovate, often exceeding 1 

 in.; heads globose, £ in. high, of an olive-green color, long- 

 peduncled; calyx-tube 1 in. long, its teeth long-setaceous and short- 

 silky, the rigid point almost naked; corolla violet-purple, small and 

 in the robust forms almost concealed; pods glabrous. — Formerly 

 abundant on the plains and valleys of northwestern Solano Co., 

 forming an important part of the hay crop in some localities; now 

 seldom seen or only in depauperate form. Possibly of hybrid origin. 

 May. 



6. T. pratense L. Red Clover. Glabrous below, pubescent 

 above, 2 ft. high or less, branching; leaflets elliptic or obovate, 1 in. 

 long; stipules entire, bristle-pointed; heads ovate, 1 in. high or 

 nearly so, sessile; calyx-teeth setaceous, exceeding the red flowers, 

 sparingly hairy. 



Well-known cultivated species from Europe: naturalized in the 

 moister parts of northern California and seemingly spontaneous on 

 the islands of the Lower Sacramento. July-Oct. 



7. T. ciliolatum Benth. Erect, 8 to 18 in. (rarely 2£ ft.) high, 

 glabrous; leaflets narrowly or cuneate-oblong to obovate, obtuse or 

 retuse, serrulate, 5 to 12 lines long; stipules broadly linear, acumi- 

 nate; flowers whitish or purplish, 3 lines long; calyx-teeth lanceolate, 

 very acute, rigidly ciliolate, often purplish; pod 1-seeded. oblong- 

 elliptic. 



Plains and valleys throughout California: Coast Ranges; Sacra- 

 mento and San Joaquin Valleys; Sierra Nevada to about 5,000 ft. 

 altitude (Amador Co., Knight's Ferry, F. W. Bancroft, Sequoia 

 National Park). Rachis sometimes prolonged through the head as a 

 sterile filament. Apr. -May. 



8. T. bifidum Gray. Erect, very slender, 7 to 12 in. high, pale 

 green and glaucous, wholly glabrous or the petioles and peduncles 

 hairy; leaflets linear, oblong, or obovate, more or less cuneate, serru- 

 late, the teeth often remote as compared with the preceding, apex 

 bifid and mucronulate, 6 to 8 lines long; stipules lanceolate, the upper 

 ovate-lanceolate, setaeeously acuminate; heads 6 to 15-flowered; calyx 

 deeply 5-parted, the subulate-setaceous teeth rather shorter than the 

 pale pink corolla; pod included', 1-seeded; seeds obovate-oblong. 



New Almaden, northward to Berkeley, Mt. Diablo, Vacaville and 

 Ukiah. Apr. Infrequent in the typical form. 



Var. decipiens Greene. Stouter, with the leaflets less deeply 

 notched and the calyces and peduncles often hairy. — Common: Santa 

 Clara Co.; Berkeley; Sacramento Valley and elsewhere. 



9. T. gracilentum T. &. G. Erect, 10 to 16 in. high, wholly 

 glabrous; leaflets obcordate, spinulose-serrulate, 5 to 7 lines long; 

 stipules linear, or those of leaves subtending peduncles, ovate, acumi- 



