Trifolium. LEGUMINOS.E. 129 



Moist or wet ground, nl)ove Yosemite Valley, at Wcstfall's Meadows, and Peregoy's, at 8,000 

 leot uUitudo, Bolandcr, Gray. 



T. UEi'ENs, Linn. (White or Diircn Clovkk.) May Vw mentioned licro tlioiigh separated 

 from the group by its wliolly axillary i)eduncles. Stem slender and creeping : leadets rounded or 

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

 digenous in America, thongii very widely naturalized and often cultivated aa a valuable forago 

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



§ 3. J lends not. involiicrate, pedunculate: leaflets 3: ovules 2: annuals. 

 * Heads mnsth/ terminal : floivers sessile, not reflexed: calyx-teeth filiform, pltcmdse. 



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

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

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

 flowers (lark 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. — Uot. Misc. iii. 179; Bet. Beechey, 330, T. alhopurpureum, Tott. & 

 Gray, Vl i. 313. 



Var. dichotomum, lirowor. A taHor and stouter form, with larger flowers in 

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

 dichotomum, Hook. & Am. liot. Beechey, 330; Torr. & Gray, Fl. i. GOO. 



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

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

 calyx-teeth. 



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

 sid)Hlate : mostly glabrous. 



12. T. ciliatum, Nutt. Glabrou,"^, 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 wliite 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. PI. 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 p.alo roso-color or ])urplisl), 2^ to 3 linos long, in rather close heads, on pedi- 

 cels a litin long or less : calyx-tube campanulate, the subidate teeth nearly equalling 

 the corolla. — Fl. i. 316. T. denndatum, Nutt. PI. 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 dee]dy notched or cleft at the apex : very slen- 

 der. — Proc. Am. Acad. vi. 522. 



Marsh's Ranch, near Mt. Diablo (^rc?wr) ; New Almadcn (Torrnf) ; near Ukiah (/?oZrt7trfer) ; 

 Osegon, Hall. 



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

 difl"use, a span higli 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. Palmrri, Watson, of Gtindalupe Island {Palmer), is a smooth diffuse .species, witli lanceo- 

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

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



