TRiFOLiuM. LEOrMlNOiS^E. 137 



long, 2-seeded, dehiscent. Common on r(3cky hillsides and river banks, 

 Brit. Columbia to California. 



T. oligauthum Steud. Nom. i, 707. T. paacijiorum Nutt. not d'Ur- 

 ville. (jlabi'ous annual: stems slender, erect, much branched from tiie 

 base and sometimes sparingly so above, about a foot high : stipules lacini- 

 ate, acuminate : lower leaflets on long petioles, cuneate-oblong, obtuse or 

 emarginate, upper ones on short petioles, lanceolate-linear, acuminate, 

 8-10 lines long by 1 -2 lines broad, distinctly and minutely spinulose-ser- 

 rulate; involucre 12-l*>'parted, about one-third the length of the flowers : 

 heads 5-7-flowered, on long filiform peduncles ; teeth of the calyx simple, 

 broadly subulate, pungtent, scarcely longer than the tube, shorter than the 

 petals; lower part of the corolla dull purple, upper part whitish : pods 2- 

 seeded. Wet places on the higher plains of the Columbia and Willamette 

 valleys. 



T. variegatum Nutt. T. & G. Fl. i, 317. Glabrous winter annual ; stems 

 weak and decumbent, 8-12 inches long, branching from the base and spar- 

 ingly above : upper stipules roundish, laciniately dentate with subulate- 

 setaceous teeth : leaflets obovate tooblong or somewhat obcordate, minutely 

 spinulose-aerrate, 3-6 lines long, peduncles filiform, longer than the leaves ; 

 involucre open-campanulate or at length spreading, laciniately many-cleft, 

 shorter than the flowers ; heads about 6 lines in diameter ; teeth of the 

 glabrous calyx equal, lanceolate-subulate with setaceous points, longer 

 than the tube, shorter than the corolla : petals purple with white tips : 

 pods small, 2-seeded. Common in wet places throughout the Willamette 

 valley. 



** Involucre membranaceous, at least at base, less deeply lobed. 



the lobes entire or toothed: corolla not becoming inflated: annuals. 



T. inici'ocephaluin Pursh Fl. 478. Villous with soft hairs: stems 

 slender, erect or decumbent, 6-20 inches long, diffusely branched from the 

 base: stipules lanceolate to ovate, acuminate, mostly entire: leaflets oli- 

 lanceolate to obcordate or obovate, denticulate: 4-6 lines long: heads 

 small, densely many-flowered ; involucre about S)-lobed, the lobes acumi- 

 nate, 3Tnervecl, entire; calyx hairy, its subulate teeth scariously margined, 

 sometimes toothed at base, attenuate to a long spinulose point, equalling 

 the corolla: ovules 2; jjods glabrous, 1 -seeded. Common in open places, 

 Brit. Columbia to California. 



. T. inicrodon H. &. A. Bot. Beech, 330, t. 79. i^'omewhat villous : 

 stems slender, erect or ascending, diffusely branched below, 6-12 inches 

 high: stipules lanceolate -to ovate, spinulose-acuminate, entire; leaflets 

 obcordate, serrate, 4-8 lines long, nearly as broad: heads small, long- 

 peduncled; involucre conspicuously cup-shaped, as long as the flowers. 

 9-12-lobed, the oblong lobes laciniately toothed: calyx glabrous, campanu- 

 late, lO-nerved, the short teeth triangular-subulate, spinose; petals rose- 

 color: pods small, 1-seeded. On dry hillsides, Brit. Columbia to Cal- 

 ifornia. 



T. cyathiferaiii Lindl, Bot. Reg. under t. 1070. Glabrous: stems erect 

 or ascending, 4-12 inches high, diffusely branched: stipules ovate to 

 lanceolate, laciniately toothed or entire; leaflets obovate to oblanceolate, 

 obtuse or acute, 6-12 lines long by half as broad; heads 6-10 lines in 

 diameter, long-peduncled ; involucre broad and membranaceous, conspic- 

 uously nerved and reticulated, 7-10-lobed, the shallow acute lobes spin ulose- 

 dentate, nearly as long as the flowers: calyx smooth, the tube somewhat 

 inflated, prominently o-nerved, the nerves excurrent into branching seta- 

 ceous tips which equal the small white corolla: pods oblong, 2-seeded. 

 About springs and on wet rocks, Brit. Columbia to California and the 

 Kpcky Mountains. 



* * * Involucre membranaceous: the upper petal becoming con | 

 spicuously inflated and enclosing the lower ones. 



