Trifolium. LEG UMINOSvE. 



127 



Corolla becoming conspicuously inflated. 



More or less villous : involucre broad, setaceously many-tootbed : 



calyx-teeth fililbrni, plumose. 23. T barbigekum 



Smooth, stout : flowers largo : involucre })road. deeply lobed or parted • 



lobes entire : teeth narrowly subulate. ' 24. T. fucatum 



Smooth, low and slender : ilowers lew, small : calyx-teeth narrowly 

 subulate. 

 Involucre with oblong entire obtuse lobes, equalling the calyx. 26 T amplectens 



Involucre nearly wanting, merely a toothed or entire disk. 25. T. depauperatum. 



§ 1. Heads not involucrate, dense: leajlets 5 to 7, rarely 3, thick : Jloivers sessile:, 

 calyx-teeth nearly equal, filifonn, plnmose: perennial. 



1. T. megacephalum, Nutt. Stout, a span hif,'h or less, somewliat villous- 

 stipules large, ovate-oblong, serrate; leaflets cuneate-oblong to obovate, obtuse" 

 mucronate, an inch long or less, toothed : heads mostly terminal, pedunculate larcre '• 

 flowers spicate, an inch long, purplish : calyx half as long, the teeth very much 

 longer than the tube: pod stipitate, 6-ovuled, smooth. —Gen. ii. 105; Torr. & 

 Gray, Fl. i. 315. Lupinaster macrocephalns, Pursh, Fl. ii, 479 t. 23. 



Sierra Valley, Sierra ('o {Lemvion) ; Diamond Mts., N. Nevada ( /F/Le/er) ; northwanl in the 

 mountains to the British boundary {Lyall) : rather rare. 



2. T. Andersonii, Gray. Dwarf, cespitose, densely silky-villous, leafy: stip- 

 ules lanceolate, acuminate, entire ; leaflets (Uineate-oblong, half an inch lon^^, acute 

 nearly entire : peduncles mostly axillary, shorter than the leaves : flowers °half an 

 inch long, purplish, umbellate ; the outer bracts forming a rudimentary involucre : 

 calyx-teeth a little shorter than the petals : pod tomentose, about 5-ovuled 1 - 2- 

 seeded. — Proc. Am. Acad. vi. 522. ' 



Sierra Valley [Lcmmm) ; Carson Valley, Nevada, AndtrHon. Growing in dense tufts or mats 

 3 or 4 inches high, the stout bases of the stems almost woody. " The roots grow very deep and 

 80 strong arc the fibres that an ordinary breaking plough with two yokes of oxen can scarcolv tear 

 them u]i. ■' 



3. T, Lemmoni, Watson. Dwarf, cespitose, alpine, sparingly appressed-pubes- 

 cent : stems rather slender, from a thick root : stipules ovate, acuminate coarsely 

 toothed ; leaflets obovate, obtuse, coarsely toothed, half an inch long or less • pedun- 

 cles mostly terminal, equalling the leaves : heads small, the rhachis only two lines 

 long : flowers numerous, spicate, very small (so far as known) : calyx villous, two 

 lines long, exceeding the purplish petals: stamlard strongly hooded: ovary smooth 

 2-ovuled. — Proc. Am. Acad. xi. 127. ' 



Lassen's Peak, Lemmon. Tlie few specimens are imperfect, only a few perhaps undeveloped 

 flowers remaining upon the receptacle. j 1 r v^^ 



§ 2. Heads not involucrate, terminal or apparently so, pedunculate : leajlets 3 : flowers 

 sessile or nearly so : biennial or perennial. 



* More or kss pubescent : calyx-teeth very narroiv, longer than the tube, plumose or 

 hairy: stipules lanceolate, acuminate. 



4. T. eriocephalum, Nutt. Erect, a span high or more, villous with spread- 

 ing hairs, or the stem and leaves rarely glabrous : stipules long, nearly entire ; leaf- 

 lets narrowly oblong or sometimes broader, 1 to 1.^ inches long, serrulate: flowers 

 in dense ovate spikes, at length reflexed, 4 to G lines long, ochroleucous : calyx- 

 teeth very villous, filiform, lax, nearly e(iualling the petals: ovary hairy, 2-4- 

 ovuled. — Torr. & (Jray, Fl. i. 313. 



Mendocino Co. (Bolnndnr), and frequent in Oregon aii<l Idaho, on moist .soils. 



5. T. plumosum, Dougl. Erect or ascending, a foot high or more, stout, some- 

 what appressed-villoiis : stipules long, entire or toothed ; leailets narrowly oblong to 

 linear, 2 to 4 inches long, serrulate : flowei-s in dense oblong or ovate spikes, not 



