298 COM POST ! At PYRROCOMA 
erous, pistillate. sometimes infertile or inconspicuous: disk-flow- 
ers cylindrical. slightly dilated upward, with short erect teeth. 
Style-branches of the ray-flowers often unequal. or one of them 
abortive, glabrous: those of the disk-flowers subulate-linear, 
elon zated, the hispid appendages much longer than the stigmatic 
portion. . Achenes linear. elongated. somewhat 3-angled and 
striate glabrous or rarely hairy. Pappus reddish-brown or ful- 
vous, of copious and uniform slender rigid bristles 
x Heads large and discoid the sterile rays being hardly apparent 
or very small for the size of the head: achenes glabrous and smooth, 
slender but flattish, 4-costate or nerved often finely striate . 
P. curthamoides. Hook- FI. i, 306, t. 107. Sten.s rigid several from 
the same rout, 6-12 inches high, leafy, -cabro puberulert when young, be- 
coming smooth, bearing a solitary terminal large head and sometimes one 
or two in axils: leaves from spatulate to oblong or lanceolate: coriaceous, 
sparingly spinulose-serrulate the lowest 3-4 inches long, taperinginto slen- 
der petioles: involucre hemispherical, 6-I: lines high, often leafy- 
subtended at. base, its proper bracts coriaceous rigid, from oblong to 
broad y lanceolate or the innerm»st linear, more or less scarious-margin- 
ed. tnost of them tipped with an abrupt mucro or cusp, the outer com- 
mouly loose and becoming leaf-like either entire or spinulose-denticulate : 
rays almost always present and rather numerous. but their ligules incon- 
spicucnus, being short involute and concealed in the pappus. On plains and 
rocky hillsides; British Columbia to 0: egon and Idaho. 
P. radiata Nutt Trans. \m. hil, Soe n. ser, vii 333. Whole plant 
glabrous: stem stout, 12-18 inches high: leaves thick,the radical and lower 
cauline obovate-oblong-the lowest 3-6 inches long by 2 inches broad, petio- 
led the upper cauline ovate-lanceolate or oblong: heads usually several 
and somewhat corymbose, an inch high and broad, bracts of the in'yo- 
lucre numerous. broad or broadish: rays very narrow, exserted but incon- 
spicuous: achenes 4 lines long. about the length of the rigid expanding 
pappus, the bristles of which are barbellate-scabrous |-ry plains near 
Walla Walla, Washington 
P. ¢ usiekii Greene Ervth. ii, 59 Aploprppus carth ‘moides Var. Cus- 
ickii Gray Stems 6-18 inches high ascending few-leaved: leaves mostly 
spatulate-lanceolate: heads comparatively smal! and few-flowered, termi- 
nal and subterminal: bracts of the involucre rather few, lanceolate, most- 
ly acute or acuminate. Union County. Oregon Cusick. 
* * Heads middle-sized to small, evidently radiate; the exserted 
rays often infertile but.styliferous 
P. racemosa '. & G. Fl ii, 244, Stems, glabrous, 12-18 inches high, 
bearing 8-7 racemose heads at the summit: leaves glabrous, lanceolate, 
slightly spinulose-serrate, the upper acute, Sblong-lanceolate, partly clasp- 
ing, the lower tapering to the base, somewhat petioled: heads hemispher- 
ical, less than an inch in diameter: involuere imbricated, in 3 series its 
ovate oblong scales pubescent; ray-flowers conspicuous and fertile; disk 
corollas shorter than the pappus: achenes sparsely hirsute. Plains of 
the ‘ olumbia. 
* * Heads obovoid, sessile and often clustered : involucre as long 
as the disk, the scales linear-oblong, with short distinct herbaceous 
tips imbricated in several series: achenes glabrous. 
P. paniculata T & G.1 ¢. Glabrous. stems a foot high, branched at 
the summit: leaves oblong-lanceolate, mucronate, obscurely and remotely 
