PYRROCOMA. COMP' '>ITiE 299 



•serrulate, the cauline partly clasping : heads numerous, 6-8 lines high, 

 ■sessile and somewhat clustered along the branches: bracts of the involu- 

 cre oblonff, obtuse, mucronate: rays 10-12, slender: achenes slightly hairy 

 toward the summit. Plains of the Columbia near Walla Walla, Washing- 

 ton 



P. arguta T &G 1 c 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 \\ alia Walla, Washington. 



P grlomerata T & G 1. c. Glabrous, ^tem simple or branched: 

 leaves obi ng lanceolate or the lower spatulate-lanceolate; very acute, 

 mostly entire, the cauline partly cla^iping : 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, vX'ashington. 



P. congresta Greene Pitt, iii; 2 1 Glabrous throughout except a 

 scanty pubescence about, the inflorescence; stems rather slender, 1 '-HO in- 

 ches high, several from the thict ligneous root, ascending, simple, leafy 

 below, floriferous from below the mindle: radical leaves lanceolate, acute 

 .at both ends, entire, the blade :i-4 inches long, on a slender petiole as long; 

 cauline smaller, tapering to asm ill winged pstiole. Heads clustered in 

 the axils of all the re lured cauline leaves : involucre campanulate, i-h lines 

 high, its bracts rigid oblong, -iuerved. with acute green tip.i : pappus 

 tawny, of coarse very unequal bristles: only the outer disk flowers fertile, 

 the achenes of these oblong, app'ressed pilose : abortive achenes of I'ay and 

 inner disk densely silky-pubescent. n dry hillsides, we.siern base of the 

 Coast mountains near Waldo, Oregon 



P. hirta Greene Eryth. ii, ad Aplopappus hirt/'S Gini/. Hirsutelypu- 

 be.=oent and villous,*even to the involucre, or at. base lanuginose: stems 8- 

 1'-' inches high, rather simple ascending, bearing few or scattered pedun- 

 culate heads : leaves membranaceous, pectinately serrate with long and 

 salient slender-suiiulate teelfi : cauline an inch or two long : radical some- 

 times 4 inches long and with margined petioles: involucre hemispherical, 

 lialf inch or more high, its b ads rather loose, lineiir, acuminate or acute, 

 -all about equalling the disk, the outer mainly foiiaceous : rays Jii or more 

 conspicuous: achenes rather shori, sericeous-pubescent: pappus oft, 

 whitish. ' astern; regon and Washington 



P. Howellii Greene 1. c. 70 Aplopappus Howellii Gray. ericeous- 

 tomentose : stems fi-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. Grain 

 Creek,' Eastern i iregon. 



P. lanceolata Aplopappus lanCeolatus l'. & G. Stems 6-24 inches high 

 at first lanuginose, at length nearjy glaibrous : 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 2-5 : 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 Aplopappvs Hallii Gray. Glabrous throughout : 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- 



