

Erigeron. COMPOSITE. 331 



leaves somewhat succulent, glabiate 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 randy with a lew teeth : involucre villous and 

 somewhat viscid : rays not very narrow, violet. — Aster California's, Less. Sti-nactis 

 glauca, Xees. WoodvMea calendulacea, DC. Erigeron maritimum, and probably 

 E. hispidum, Xutt. 1. c. 



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

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



1 7. E. 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 double; the outer a crown or circle of chaffy squamellm 

 rather than bristles, hardly longer than the breadth of the akene and persist: nt : 

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

 cous. — Phalacroloma, Torr. & Gray. 

 * Branched from the linse and spreading : pappus alilce in ray and disk flowers. 



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

 so high, eorymbosely 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. Jiellidiastrum, Gray in Hall, Oregon Coll. : Eaton in 

 I! it. King Exp. 150, not of Xutt, (which has simple very deciduous pappus, broad 

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

 Mountains). 



Siena Valley (Zemmon, with bright-colored rays) : common in Oregon and Nevada, probably 

 in all adj u 'Hi p .ii i a .if i alifornia : extending to Nebraska and New Mexico. Near Fori Mohave, 

 Or. < '■■•>/■• r : a form like E. cinercum, Gray, which is apparently a low variety, with less convex 

 reccpl u le. 



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

 bose, comparatic, ly small : ray-flowi rs having only the short outt r pappus, tin si, ndt r 

 bristles wanting, and in tfu disk-flowers 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 j heads loosely corymbed : rays 2 or 3 lines long. 



Plumas I ii. (/.. miiitiii) to Oregon ; a form with coarser and looser hairiness than the eastern 

 plant, approaching /:'. mutinim. 



E. wsri m, 1'ci,., differs from this in being larger i" t" 5 feet high), hirsute with spreading 

 i in I il rate or ovate-lanceolate lower leaves coarsely toothed or cut Ii is a weed of cul- 

 tivated grounds, originally Iron) 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 inconspicuous or minutt {whitish), hardly , //,, pale 



y, How or whitish disk-flowi rs .■ pappus simple. - - Genotus. 



20. E. Canadense, Linn. (Hobseweed.) k homeh. weed, with slender strictlj 

 erect stem, from a few inches to I or •"> feet high, nearly glabrous or sparse!] 





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