TKIROLU-M. LEGUMIXO&.E. 1:57 



long, 2-seeded, dehiscent. Common on rocky hillsides and river banks. 

 Brit. Columbia to California. 



T. oilman 111 inn Steiul. Norn, i, 707. T. pancijiui-um Nutt. not d'Ur- 

 ville. Glabrous annual: stems slender, erect, much branched from the 

 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, 

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

 r-ulate ;_ involucre 12-Hi-parted* about one-third the -length of the flowers: 

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

 broadly subulate, pungent, 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. variegatuiu 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 to oblong or some what obcordate, minutely 

 spinulose-serrate, 3-0 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 lobe*!. 



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



T. microrephaluni Pursh Fl. 478. Yillous 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 ob- 

 lanceolate to obcordate or obovate, denticulate: 4-^0 lines long: heads 

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

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

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

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

 Brit. Columbia to California. 



T. inierodoii'H. tfc. A. Bot. Beech, 331), t. 79. Somewhat villous: 

 stems slender, erect or ascending, diffusely branched below, <>-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. 

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

 late, 10-nerved, the short teeth triangular-subulate, spinose ; petals rose- 

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

 ifornia. 



T. cyatliiferum Lindl, Bot. lieg. 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, H-12 lines long by half as broad: heads 0-10 lines in 

 diameter, long-pedttncled ; involucre broad and membranaeeoiis, conspic- 

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

 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. 

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

 Rocky Mountains. 



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

 spk-uously inflated and enclosing the lower ones. 



