Trifolium. LEGUMINOS^E. 129 



Moist or wet ground, above Yosemite Valley, at Westfall's Meadows, and Peregoy's, at 8,000 

 feet altitude, Bolander, Gray. 



T. KEPEXS, Linn. (WHITE or DUTCH CLOVER.) May be mentioned here though separated 

 from the group by its wholly axillary peduncles. Stem slender and creeping : leaflets rounded or 

 obcordate : flowers small, white, in loose globose heads. Native of Europe, probably not in- 

 digenous in America, though very widely naturalized and often cultivated as a valuable forage 

 plant. Introduced into the cooler parts of the State ; more common northward. 



3. Heads not involucr ate, pedunculate: leaflets 3: ovules 2: annuals. 

 * Heads mostly terminal : flowers sessile, not reflexed : calyx-teeth filiform, plumose. 



11. T. Macraei, Hook. & Arn. Somewhat villous with appressed or spreading 

 hairs, erect, slender, a half to a foot high : stipules ovate to lanceolate ; leaflets 

 obovate to narrowly oblong, obtuse or retuse, serrulate, about half an inch long : 

 flowers dark purple, 3 lines long, in dense ovate long-peduncled heads : calyx very 

 villous ; the straight teeth as long as the petals, often tinged with purple : pod 

 1 -seeded. Bot. Misc. iii. 179; Bot. Beechey, 330. T. albopurpureum, Torr. & 

 Gray, Fl. i. 313. 



Var. dichotomum, Brewer. A taller and stouter form, with larger flowers in 

 heads nearly an inch long : corolla more conspicuous, tipped with white. T. 

 dichotomum, Hook. & Arn. Bot. Beechey, 330 ; Torr. & Gray, Fl. i. 690. 



On dry hillsides in early spring, chiefly in the Coast Ranges, from Santa Barbara to the Co- 

 lumbia River ; also in ChilL The Chilian form appears to have nearly sessile heads and stouter 

 calyx-teeth. 



* * Heads axillary, small : flowers on short pedicels, at length reflexed : calyx-teeth 



subulate : mostly glabrous. 



12. T. ciliatum, Xutt. Glabrous, erect, often 1 to 2 feet high : stipules usually 

 narrow, acuminate ; leaflets cuneate-oblong to obovate, a half to an inch long, ob- 

 tuse or retuse, serrulate : corolla white or purplish, little exserted, 3 lines long : 

 calyx-tube campanulate ; teeth lanceolate, very acute, rigid, the scarious margin 

 rigidly ciliolate. PI. Gambel. 152. T. ciliolatum, Benth. PL Hartw. 304. 



On dry hillsides from Los Angeles to the Columbia ; readily distinguished by the calyx. 



13. T. gracilentum, Torr. & Gray. Erect, slender, glabrous (the peduncles 

 and calyx rarely somewhat villous), a foot high or less : stipules lanceolate ; leaflets 

 cuneate-oblong to obovate or obcordate, retuse, about half an inch long, serrulate : 

 flowers pale rose-color or purplish, 2^ to 3 lines long, in rather close heads, on pedi- 

 cels a line long or less : calyx-tube campanulate, the subulate teeth nearly equalling 

 the corolla. FL i. 316. T. denudatum, Nutt. PL Gambel. 152, t. 24. 



On low hills and in the valleys from Los Angeles to the Columbia River. 



14. T. bifidum, Gray. Exactly like the last, but the leaflets narrow, the sides 

 sparingly toothed or entire, and all deeply notched or cleft at the apex : very slen- 

 der. Proc. Am. Acad. vi. 522. 



Marsh's Ranch, near Mt. Diablo (Brewer) ; New Almaden (Torrey) ; near Ukiah (Bolander) ; 

 Oregon, Hall. 



15. T. Breweri, Watson. Somewhat pubescent throughout, very slender and 

 diffuse, a span high or more : stipules lanceolate ; leaflets obcordate to oblong, 

 mostly retuse, toothed or serrulate, 3 to 9 lines long : flowers few, in very loose 

 heads, nearly white, 2 to 4 lines long, on slender pedicels often half as long : calyx 

 very narrow, the slender teeth much shorter than the corolla. Proc. Am. Acad. 

 xi. 131. 



In the Sierra Nevada, from Mariposa Co. to Sierra Co. 



T. PALMERI, Watson, of Guadalupe Island (Palmer), is a smooth diffuse species, with lanceo- 

 late long-acuminate stipules and narrowly oblong leaflets, acute at each end, half an inch long : 

 flowers purplish, 3 lines long, in rather close heads ; teeth subulate, nearly equalling the corolla. 



