306 COMPO^IT^E . TOWNSENDIA 



SERICOCARPUS 



the ray >ometimes triangular. Pappus a single series of long 

 awns "or of coarse and rigid bristles or in the ray reduced to 

 sijiiamella? or palea^. 



T. f arryi Eaton Am \at.viii, 212. Stems erect, stout, naked and 

 pedunculiform a ove, 2-6 inches high, the taller forms sometimes branch- 

 ing: leaves mostly spatulate : bracts of the very broad involucre lanceolate, 

 thinnish, with rather soft attenuate tips or the outer barely acuminate: 

 achenes narrowly ohovate canesi-ently pubescent the hairs simple or many 

 of them 2-dentate at tip. i appus of ray-flowers plurisetose, like that of 

 the disk. Idaho to V\ yoming and Montana 



T. florifer Gray Proc. Am. Acad xvi, 84. Cinereous-hirsute : stems 

 rather slender, 4-10 inches long, leafy: leaves linear or the lowest lanceo- 

 late-spatulate, acute, mostly apiculate-acuminate: heads rather large, pe- 

 dunculate : bracts of the involucre linear-lanceolate not prominently acum- 

 inate nearly equal : achenes oblong-obovate, pubescent: pappus of numer- 

 ous setose barb el hi late bristles. On sandy banks am", arid plains of th^ 

 Columbia. 



1.6 SER CMCARPUS Nees Ast. 148. 



Perennial herbs with alternate commonly entire and sessile 

 leaves, and small heads of white flowers usually fascicled in a 

 terminal compact cyme. ; eads 12 15- flowered, the rays ab<>ut 

 5, <listant. Bracts of the obovate-obhmg or turbinate-cylindri- 

 cal involucre closely imbricated in several series, nerveless or 

 obscurely 1-nerved, the lower portion cartilaginous, appressed, 

 the apex herbaceous, often spreading. Receptacle small, alveo- 

 late, the alv ola toothed or lacerate ciliate. Apendages of the 

 style lanceolate-subulate, minutely hispid, longer than the stig- 

 matic portion. Achenes ubpyramidal, short, densely silky. 

 Pappus simple, composed of rather numerous and rigid unequal 

 scabrous bristles, some of them thickened upward. 



S rigidus l.indl, Hook. Fl. ii, 14. Minutely scabrous : stems slender, 

 1-2 feet high, mostly simple, leafy: leaves rigid, oblong spatulate obtuse, 

 often mucronate, entire, somewhat 3-nerved, the margins ciliate-scabrous 

 10-12 lines long: heads about 15 flowered, clustered in small compact cory- 

 mbs: bracts of the turbiuate involucre narrowly oblong or linear, 1-nerved, 

 the inner ones about equalling the disk, somewhat ^carious; the outer 

 shorter and with somewhat squarro&e greenish tips: rays but little if at all 

 exserted achenes when mature about half as long as the white pappus, 

 slender, not very densely silky. On ury ridges Oregon and Washington to 

 the Sierra Nevadasin California. 



S. Oregonensis Nutt. Trans. Am. Khil.Soc. vii, 802 Nearly glab- 

 rous: stems rather stout, 2-/J feet high, corymbosely branched above: 

 leaves broadly lanceolate, acutish entire 1-nerved, scabrous 1-2 inches 

 long by 6 lines broad, thickish, narrowed below: beads about In-flowered, 

 clustered in small compact corymbs: bracts of the turbinate involucre ob- 

 long-linear 1-nerved: rays conspicuously exserted: achenes slender, iully 

 half as long as the white pappus, slender, not very densely silky. On dry 

 or gravelly plains western Oregon and Washington. 



