ASTERACE.3E. 173 



5. PYRROCOMA, Hook. Rigid perennial herbs, with coriaceous 

 mostly radical leaves from a fusiform caudex. Stems leafy-bracted, 

 bearing racemose or panicled middle sized heads. Bracts of hemispher- 

 ical involucre many, rigid, with herbaceous more or less squarrose tips. 

 Flowers yellow; those of the ray rather numerous, short, pistillate; of 

 the disk tubular, slightly dilated upwards. Style- appendages subulate- 

 linear, pubescent. Achenes more or less flattened and striate, glabrous 

 or pubescent. Pappus of copious reddish or brownish slender but rigid 

 unequal bristles. 



1. P. elata. Stout, erect, 1 3 ft. high, glabrous: radical leaves 

 long-petioled, 6 8 in. long, lanceolate, entire; cauline 1 3 in., sessile, 

 ascending: heads J in. high and as broad, disposed in an interrupted 

 spike or narrow panicle : involucral bracts rigid, imbricated in several 

 series, the green tips acute, spreading: achenes flattened, closely cos- 

 tate, pubescent A somewhat rare plant of subsaline soils at Oalistoga 

 and near San Jose. July October. 



6. HETEROTHECA, Cassini. Tall hairy herbs, with alternate 

 leaves, and a terminal corymbose panicle of middle-sized heads. Invol- 

 ucres ovate; their bracts closely imbricated in many series, without 

 spreading tips. Flowers yellow; those of the ray pistillate, 'of the disk 

 perfect, the later with ovate or lanceolate style-appendages. Achenes 

 compressed, pubescent, those of the ray thin-triquetrous with caducous 

 pappus or none; pappus of disk achenes of an outer series of sparse 

 short bristles, and an inner, more copious series of longer ones. 



1. H. grandiflora, Nutt. Annual or biennial, 36 ft. high, hirsute, 

 the inflorescence viscid and strong-scented by a coat of short gland- 

 tipped hairs: cauline leaves oval or oblong, coarsely toothed, partly 

 vertical by a twist in the petiole, this at base bearing 2 stipuliform lobes : 

 involucre % in. high : ray achenes without pappus, those of the disk 

 with but faint traces of the outer and shorter bristles. Frequent along 

 railways in Contra Costa Co.; an immigrant from S. Calif. July Dec. 



7. CHRYSOPSIS, Elliott. Perennials, leafy -stemmed and of rather 

 low growth. Leaves sessile, entire or nearly so. Heads middle-sized, 

 terminating corymbose or fastigiate branches. Involucres ovate or 

 broader, of narrow regularly imbricated bracts in several series. Style- 

 appendages linear-filiform to slender-subulate. Achenes compressed, 

 obovate to linear-fusiform; pappus fuscous, of many capillary scabrous 

 bristles, with or without an outer series of short bristles or palese. 



* Heads radiate; outer pappus setose-squamellate. 



1. C. sessiliflora, Nutt. Slender, sparsely pilose-hispid, viscid-gland- 

 ular: leaves oblanceolate, sharply pointed: corymbose branches ending 

 in about 3 subsessile heads % i Q - high.* kafy-bracted at base: bracts of 



