= 
TRIFOLIUM. LBGUMINOS2E. 137 
long, 2-seeded, dehiscent. Common on rocky hillsides and river banks, 
Brit. Columbia to California. 
T. oligauthum Steud. Nom. i, 707. :7. pauciflorum 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, 
8-10 lines long by 1-2 lines broad, distinctly and minutely spinulose-ser- 
rulate; involucre 12-16-parted, about one-third the length of the flowers: 
heads'5+7-flowered, on long babe Sirol siege 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 pinces on the higher plains of the Columbia and Willamette 
valleys. 
T. variegatum Nutt. T. & G. Fl. i, 317. Glabrous winter annual; stems 
Weak and deculibent, 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-serrate, 3-6 lines long, peduncles filiiorm, longer than the leaves ; 
involucre open-campanulate or at length spreading, laciniately many-cleit, 
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. microcephalum Pursh Fl. 478. Villous with soft hairs: stems 
» slender; erect ortecum bent, 0-20 inches long, diffusely branched from the 
s , ere 
base: stipnles lanceolate to ovate, acuminate, mostly entire: leaflets ob- 
lanceolate to obcordate or obovate, denticulate: 4-6 lines long: heads 
small, densely many-flowered; involucre about 9-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 
» a 
et ee 
Cyrlls 
oa: 
the corolla: ovules 2; pods glabrous, l-seeded. Corimon in open places,. 
Brit. Columbia to California. 
T. .microdon H. &.. A. «Bot. Beech, 330, t. 79. Somewhat villous: 
stems slender, erect or ascending, diffusely branched below, 6-12 inches 
high: stipules lanceolate to ovate,-spinulose-acuminate, entire; leaflets 
obeordate, serrate, 4-8 lines long, nearly as broad: heads small, long- 
peduncled; inyolucre conspicuously cup-shaped, as long as the flowers, 
9-12-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. eyathiferum 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 spinulose- 
dentate, neariy as long as the flowers: calyx smooth, the tube somewhat 
inflated, prominently 5-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 
Rocky Mountains. ; 
* * * Tnvolucre membranaceous: the upper. petal becoming con, 
spicuously inflated and enclosing the lower ones. 
