366 COMPOSITiE. 



10. PYRROCOMA, Hooker. EigiJ perenuial lierbs, with coriaceous 

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

 ing racemose or pauicled middle sized heads. Bracts of hemispherical 

 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. data, Greene, Man. 173 (1894). Stout, erect, 1—3 ft. high, 

 glabrous: radical leaves long-petioled, 6 — 8 in. long, lanceolate, entire; 

 cauline 1 — 3 in., sessile, ascending, rigidly ciliolate: heads % ^^- high 

 and as broad, disposed in an interrupted spike or narrow panicle: invol- 

 ucral bracts rigid, imbricated in several series, the green tips acute, 

 spreading: achenes flattened, closely costate, pubescent. — A somewhat 

 rare plant of subsaline soils at Calistoga and near San Jose. July — Oct. 



2. P. paniculata, T. & G. Fl. ii. 244 (1842); Nutt. Trans. Am. Phil. 

 Soc. vii. 331 (1840), under Homopappus. Stoutish, erect, 1—2 ft. high, 

 glabroiis : radical leaves oblong-lanceolate, obscurely and remotely 

 serrulate; cauline shorter and broader, sessile and clasping: beads (pan- 

 icled in the Oregonian type) differing according to the varieties. Var. 

 virgata (Gray). Heads few, small, but broad, forming a virgate spike. 

 Var. steiiocepliala (Gray). Heads few, narrow and cylindric, forming a 

 raceme or panicle. — The type not within our limits: the two varieties on 

 the eastern slope of the Sierra. 



3. P. apargioides, Greene, Eryth. ii. 70 (1894); Gray, Proc. Am. 



Acad. vii. 354 (18G8j, under Ap/opappus. Low-growing, and the texture 

 not rigid : radical leaves broadly lanceolate, from serrate to laciiiiate- 

 toothed and pinnatifid: scapiform flowering stems several or many, 

 decumbent or ascending, a few inches high, or seldom nearly a foot high, 

 bearing one or several middle-sized heads: involucre hemispherical, 

 ^ in. high; bracts lanceolate, loosely imbricated in few ranks: rays 20 

 or more : pappus rather soft. — Eastern slope of the Sierra Nevada. 



11. STENOTUS, NiUtall. Glabrous evergreen suffruticose or shrubby 

 plants. Leaves alternate, narrow, entire. Heads solitary on scapiform 

 peduncles, or at the ends of the branches. Involucre hemispherical; 

 bracts in two or three series, membranaceous, scarious-margined, closely 

 appressed. Flowers yellow ; rays few ; disk-corollas dilated above, 

 deeply 5-toothed. Style-appendages filiform, flattened, puberulent : 

 achenes oblong, somewhat compressed, densely villous ;v pappus very 

 slender, permanently white. 



