306 COMPO^IT^E TOWNSENDIA 



°SERICOCARPUS 



the ray sometimes triangular. Pappus a single series of long 

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

 squamellse or palea*. 



T. } arryi Eaton Am Nat. 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, obovate canescently pubescent the hairs simple or many 

 of them 2-dentate at tip. i appus of ray-flowers plnrisetose, 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 ianeeo- 

 late-spatulate, acute, mostly apiculate-aeuminate : 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 barbellulate bristles. On sandy banks anc arid plains of tho 

 Columbia. 



16 SER OoCARPUs'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, a eads 12-15-nowered, the rays abmit 

 5, distant. Bracts of the obovate-oblnng 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 ob pyramidal, short, densely silky. 

 Pappus simple, composed of rather numerous and rigid unequal 

 scabrous bristles, some of them thickened upward. 



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

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

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

 10-12 lines long: heads about 15 flowered, clustered in small compact c< ry- 

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

 the inner ones about equalling - the disk, somewhat -various; the outer 

 shorter and with somewhat squarrose 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 c ry ridges Oregon and Washington to 

 the sierra Nevadasin California. 



S. Oregonensis Nutt. Trans. Am. Phil. Soc. vii, 302 Nearly glab- 

 rous: stems rather stout, 2-.'i feet high, corymbosely branched al ove: 

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

 long by t> lines broad, thickish, narrowed below: heads about ]5-flowered, 

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

 long-linear l-nerved': rays conspicuously exserted: achenes slender, fully 

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

 or gravelly plains western Oregon and Washington. 



