Erigeron. COMPOSITE. 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 teeth : involucre villous and 

 somewhat viscid : rays not very narrow, violet. — Aster CaLifornicus, Less. Steiiactis 

 (/laaca, Nees. WoodviUea calendtdacea, DC Erigeron maritiiiium, and probably 

 E. hispidum, Xutt. 1. c. 



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

 eter, ini'luding the rays, the name inappropriate, as the herbage is seldom at all glaucous. 



1 7. £j. Philadelphicum, Linn. Pubescent or rather hirsute : stems erect from 

 a perhaps biennial root, 1 to 3 feet high, leafy to the summit, bearing several or 

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

 ceolate and partly clasping at base ; the lowest obovate or spatulate ; all more or 

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

 hirsute : rays very narrow and numerous, flesh-colored or reddish-purple : pappus 

 simple. — E. purpureum, Ait. 



Moist open grounds, apparently not rare through the length of California and in Oregon ; com- 

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



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

 rays : pappus plainly doid)le ; the outer a croion or circle of chaffy squamellce 

 rather than h^istles, 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 and spreading : pappxis cdike in ray and disk floiuers. 



18. E. divergens, Torr. & Gray. Hoary-pubescent, difl"use, a span to a foot or 

 so high, c(jrymboseiy branching ; the branches terminated by solitary peduncled 

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

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

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

 commonly very convex. — E. Bellidiastrum, 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 unknown west of the Eocky 

 Mountains). 



Sierra Valley {Lemmon, with bright-colored rays) : common in Oregon and Nevada, probably 

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

 Dr. CooiKT ; a form like E. cinereum, Gray, which is apparently a low variety, with less convex 

 receptacle. 



* * Stem erect, 2 to 5 feet high, branching only above : heads numerous, loosely corym- 

 bose, comparatively smcdl : ray-flowers having only the short outer pappus, the slender 

 bristles wanting, and in the disk-floivers very deciduous : rays white. 



19. E. strigosum, Muhl. Slender, 2 to 4 feet high, roughish or somewhat 

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

 spatulate and sometimes toothed : heads loosely corymbed : rays 2 or 3 lines long. 



Plumas Co. {Lemmon) to Oregon ; a form with coarser and looser hairiness than the eastern 

 plant, approaching E. annuum. 



E. ANNUUM, Pers., differs from this in being larger (3 to 5 feet high), hii-sute 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 temperate 

 regions, and probably has reached or will reach California. 



§ 3. Annuals, with very numerous small {not over 2 lines long) and narrow heads in 

 a panicle : rays inconsjncuous or minute (ivhitish), hardly exceeding the ^ja/e 

 yellow or whitish disk-flowers : pappus simple. — CJiXOTUS. 



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

 erect stem, from a few inches to 4 or 5 feet high, nearly glabrous or spai-sely 



