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PYRROCOMA, COMP. SIT 42 299 
—serrulate, the eauline partly clasping: heads numerous, 6-8 lines high, 
sessile and sornewhat clustered along the branches: bracts of the involu- 
cre oblong, obtuse, mucronate: rays 19-12, slender:.achenes slightly hairy 
toward the summit. Plains of the Columbia near Walla Walla, Washing- 
ton ; : 
Pp. arguta T &G 1 Glabrous. Stems 10-12 inches high: leaves 
spatulate-lanceolate, somewhat acuminate, sharply serrate, the cauline 
partly clasping: heads axillary and terminal, clustered, sessile, bracts of 
the involucre lanceolate, acute: rays 10-12, usually infertile. Plains of 
the Columbia near \\alla Walla, Washington. 
P glomerata T; & G 1. c. Glabrous. ‘Stem simple or branched: 
leaves ob] ng lanceolate or the lower spatulate-lanceolate; very acute, 
mostly entire, the cauline partly clasping: heads 6 lines long, nearly as 
broad, clustered and disposed in an interrupted spike: rays 8-10, usually 
fertile. Plains of the Columbia near Walla Walla, \\Vashington. 
P. congesta Greene Pitt, iii; 23  Glabrous throughout except a 
‘scanty pubescence about the inflorescence: stems rather slender, 1 '-30 in- 
ches high, several froin the thick ligneous root, ascending, simple, leafy 
below, floriferous-from below the minadle: radical leaves lanceolate, acute. 
at both ends, entire,the blade 3-4 inches long, ona slender petiole as long ; 
cauline smaller. tapering to asmall winged petiole. Heads clustered in 
the axils of all the re luced cauline leaves: involucre campanulate, 4-5 lines 
high, its bracts: rigid oblong. 3-nerved. with acnte green tips: pappus 
tawny, of coarse very unequal bristles: only the outer disk flowers fertile, 
the achenes of these oblong. appressed pilose: abortive achenes of ray and 
inner disk densely silky-pubescent. © dry hillsides, western base of the 
Coast mountains near Waldo, Oregon 
P. hirta Greene Eryth. ii, 69 Aplopappus hirtus Gray. Hirsutely pu- 
bescent and villous, even to the involucre, or at base lanuginose: stems 8- 
12 inches high.-rather simple ascending, bearing few or scattered pedun- 
culate heads: leaves membranaceous, pectinately serrate with long and 
salient slender-sululate teeth: cauline an inch or two long: radical] some- 
times 4 inches long and with margined petioles: involucre hemispherical, 
half inch or more high, its b acts rather loose, linear, acuniinate or acute, 
all about equalling the disk, the outer mainly foliaceous: rays 20 or more 
conspicnous: achenes rather short, sericeous-pubescent: pappus 0. , 
whitish. + astern rezon and Washington 
P. Howellii Greene |. c. 70 <Aplopappus Howellii Gray. ericeous- 
tomentose: stems 6-1 inches long ascending branching from the ‘base: 
leaves all narrowly lanceolate, acute, entire or rarely denticulate: heads 
solitary, terminating the stem an branches, rather few-flowered involu- 
-cre 6-10 lines high, its bracts linear, rather obtuse, all of equal length: 
rays conspicuous; style appendages long and slender: achenes oblong lin- 
ear, nearly as long as the rigid pappus, pubescent. On dry ridges, Crain 
Creek, Eastern (/regon. - . 
k. lanceolata Aplopappus lanceolatus '. & G. Stems 6-24 inches high 
at first lanuginose, at length nearly glabrous: leaves coriaceous the radical 
and lowest cauline lanceolate, acute irregularly spinulose-toothed, peti 
oled: the upper small and bract like, linear-lanceolate, partly clasping: 
heads 2-6: involucre hemispherical, its bracts lanceolate-oblong. charta- 
eous, unequal, imbricated: rays 2:-25 pistillate: style appendages lanceo- 
late acute a out the length of the stigmatic portion: achenes silky. Idaho 
to British Columbia and the plains of the Saskatchewan. 
P. Hallii Aplopappus Hallii Gray. Glabrous threughout: stems 12- 
20 inches high. paniculately branched from a suffrutescent or even more 
woody base, very leafy: leaves lanceolate or linear, 8-12 lines long by 2-3 
lines broad rather rigid, mostly scabrous on the margins, midrib promi- 
