386 C O M P O S I T iE. 



2. C. liiNiFOLiA. Erigeron linifoUus, Willd. Sp. iii. 1955 (1803). Not 

 as tall as the last, seldom 2 ft. high, more strict and less paniculate, in 

 the early state of flowering scarcely more than racemose: herbage some- 

 what cauescently hirsute and also scabrous with a minute appressed 

 pubescence: lowest and linear-spatulate leaves incisely toothed, the 

 narrowly linear upper ones entire: involucre }^ in. high, broadly ovoid, 

 cinereous-pubescent: rays very small: pappus slightly accrescent, firm 

 and reddish or brownish. — Established on sandy banks of the Sacra- 

 mento River opposite Sacramento, where it was collected by the author 

 in 1895. Native of tropical America. July— Sept. 



3. C. Coulteri. Conyza Coulteri, Gray, Proc. Am. Acad. vii. 355 

 (1868). Erigeron discoidem, Kell. Proc. Calif. Acad. v. 55 (1872). Size of 

 the last, the heads quite as large, but closely pauicled as in n. 1; herbage 

 viscidly pubescent, and also with some longer and hirsute hairs: leaves 

 .spatulate-oblong and oblanceolate, from coarsely toothed to laciniate- 

 pinnatifid: involucre rather softly hirsute: corollas white, none ligulate, 

 the female ones consisting of a short truncate tube, and these extremely 

 numerous, only a few of the central ones of the head bisexual: pappus 

 very fine and white, somewhat accrescent. - Not infrequent in the inte- 

 rior of the State, yet nowhere common, and probably not native. Aug., 

 Sept. 



29. ERKwEROK, Lhimeus, in part. Genus of perennials and bi- 

 ennials, very diverse in habit, the more typical species readily distin- 

 guished from Aster by long narrow subequal involucral bracts, and 

 excessively numerous almost filiform ray-flowers. Other groups quite 

 like Aster in these particulars; others wholly destitute of rays; but all 

 differing from the genuine Asters in a far more simple inflorescence, a 

 coarser and more scanty pubescence, more scanty i^appus, and especially 

 liy short and rounded or blunt style-tips. 



i^ Perennials irilh radical leaves largest, tlie cauline diminished apioards; 

 heads solitary or few; pappus simple. 



-i— Heads sahraceinose; rays very many, short, filiform, suberect. — Genus 

 Trimorpha, Cass. 



1. E. racemosus, Nutt. Trans. Am. Phil. Soc. vii. 312 (1810): E. 

 arineriafolius, Gray, not of Turcz. Stems commonly several from the 

 root, slender, erect, 1 ft. high more or less, glabrous or with a few bristly 

 hairs ; the oblanceolate and linear leaves hirsute-ciliate below the 

 middle, all entire: heads simply racemose, or somewhat corymbose- 

 ]»anicled; involucre 3—4 Hues high, broad-campanulate or subhemi- 

 spberical; filiform rays purplish; pappus somewhat accrescent, dull-white 



