Eriyeron. COMrOSIT^.. 331 



leaves somewhat succulent, glabrate with age, 1 to 4 inches long, all broad and 

 obtuse, obovate or spatulate-oblong, entire ; the lowest and radical ones narrowed 

 below into a margined petiole, and rarely with a few tectli : involucre villous and 

 somewhat viscid : rays not very narrow, violet. — Axler Ca/i/oniiats, Less. Stetiadis 

 glauca, Necs. Woodvillea calendidacea, DC. Erifjeron maritimum, and i)rol)ably 

 E. hispidum, Nutt. 1. c. 



Sea-shore, from Monterey to Oregon ; flowering at almost all seasons. Head 2 inches in diam- 

 eter, including the rays, the namo inappropriate, as the herbage is seldom at all glaucous. 



17. E. Philadelphlcum, liinn. I'tiboscent or rather hirsute : Htenis erect from 

 a perhai)s biennial root, 1 to 3 foot high, leafy to the summit, hearing several or 

 numerous corymbose rather small heads : leaves oblong, or the upper oblong-lan- 

 ceolate and partly clasping at base ; the lowest obovate or s[)atulate ; all njore or 

 less irregularly toothed, occasionally nearly entire : involucre minutely appressed- 

 hirsute : rays very narrow and numerous, llcsh-colorcd or reddish-i)urplc : pajipus 

 simple. — E. jmrpnreum,, Ait. 



Moist open grounds, aj)parently not rare through the le!)gth of California and in Oregon ; com- 

 mon in the Atlantic States. Heads less than an nich in "diameter, including the slender rays. 



§ 2. Annuals or sometimes biennials, with small or rather small heads and conspicuous 

 rays: pappxis plainly double; the outer a crown or circle of chaffy squamellte 

 rather than bristles, hardly longer than the breadth of the akene and persistent ; 

 the inner of the ordinary slender bristles, but scanty, and deciduous or cadu- 

 cous. — Phalacroloma, Torr. & Gray. 

 « Branched from the base arid spreading : pappus alike in ray and disk ffowers. 



18. E. divergens, Torr. i^: Gray, lloary-pubesoent, diffuse, a span to a foot or 

 80 high, corymbosely l)ranching ; tlio branches terminated by solitary ])cduncled 

 heads : leaves linear, the lowest spatulato and sometimes sparingly toothed or 

 incised : involucre hirsute (about two lines higli) : rays very numerous and slender, 

 pale purple and white, or sometimes bright blue-purph% 3 lines long : receptacle 

 commonly very convex. — E. Bellidiastrnm, Gray in Hall, Oregon Coll. ; Eaton in 

 Bot. King Exp. 150, not of Nutt. (which has simple very deciduous pappus, broad 

 white top to the akene, very flat receptacle, and is ujiknowu west of the Rocky 

 Mountains). 



• Sierra Valley (Lcnmon, with bright-colored rays) : common in Oi-cgon and Nevada, probably 

 in all adjacent parts of California ; extending to Nebraska and New Mexico. Near Tort Mohave, 

 Dr. Cooper; a form like E. cincrcum, Cray, whicli is apparently a low variety, with less convex 

 receptacle. ' 



* * Stem erect, 2 to ^^ feet high, branching only above : heada numerous, loosely corym- 

 bose, comparatively small : ray-flowers having only the short outer pappus, th^ slender 

 bristles ivanting, and in the diRk-flowers very deciduous : rays white. 



19. E. Strigosum, Muhl. Slender, 2 to 4 feet high, roughisb or somewhat 

 grayish with a very short appressed pubescence : leaves lanceolate, entire, or the lower 

 spatulato and sometimes toothed : lieads loosely corymbed : rays 2 or 3 lines long. 



Plumas Co. (Lcmmon) to Oregon ; a form with coarser and looser hairiiuws than the eastern 

 plant, approaching E. annmcm. 



E. ANNUUM, Pers., differs from this in being larger (3 to 5 feet high), hirsute with spreading 

 hairs, and the ovate or ovate-lanceolate lower leaves coarsely toothed or cut. It is a weed of cul- 

 tivated grounds, originally from the Atlantic States, now dispersed over the northern tennM-rate 

 regions, and probably has reached or will reach California. 



§ 3. Anmials, with very numerous small (not over 2 linrx long) and narrow heads in 

 a panicle : rays inconspicuous or minute (whitish), hardly exceeding the pale 

 xje.llow or whitish disk-flowers : pappus simple. — C/ENOTUS. 



20. E. Canadense, Linn. (Horseweed.) A homely weed, with slender strictly 

 erect st^.ra, from a few inches to 4 or 5 feet high, nearly glabi-ous or sparsely 



