Erigeron. COMPOSITE. 329 



+- -t- -t- Leaves entire and narrow,' numerous all along the branching flowering stems: 

 akenes in all '2-nerved or only some of the outermost 3-nerved. 



-n- Leaves all filiform, canescent. 



9. E. filifolium, Nutt. Hoary with minute appressecl pubescence ; stems a 

 span to a foot or more high from a somewhat woody decumbent base or branching 

 rootstock, slender, usually corymbosely branching : leaves very narrowly linear (an 

 inch or two long, a line or much less in width), and becoming filiform, the upper- 

 most reduced to minute subulate bracts : involucre canescent and somewhat hirsute, 

 2 or 3 lines high, the outer scales shorter : rays 50 to 80, white or pink (3 or 

 4 lines long) : akenes sparsely and minutely hairy, becoming glabrous : pappus 

 almost simple, the short outer bristles indistinct. Diplopappus filifolius, Hook. 

 Chrysopsis canescens, DC. 



Plumas Co. (Lcmmon) ; near Carson City (Anderson), thence northward, rather common in 

 the interior districts to Oregon and Idaho. 



*-+ -n- Leaves flat, from narrowly linear to lanceolate. 



= Pappus simple or the outer of fine and short bristles : heads (except in the last) 

 corymbose at the summit of the very leafy stem : rays in a single series. 



10. E. Breweri, Gray. Somewhat hoary with fine and short scabrous-hirsute 

 pubescence : stems ascending or erect from a slender creeping rootstock, a span to a 

 foot high, slender, leafy to the summit, bearing solitary or few corymbose heads : 

 leaves short (half an inch to aji inch long), linear-spatulate or narrowly oblance- 

 olate : involucre glabrous (2 or 3 lines high) ; its scales glabrous, unequal, the outer 

 successively shorter : rays only about 15 (remarkably few for an Erigeron), violet, 

 narrow : pappus nearly simple, the outer set of bristles if present very short and 

 inconspicuous. Proc. Am. Acad. vi. 541. 



Woods of the Sierra Nevada, Mariposa Co., at 4,000 to 6,000 feet, Brewer, Torrey, Gray. 

 Above Carson City, Nevada, Anderson. This might as well be ranked as an Aster, of the 

 Orthomeris section, except for the style-appendages and an obvious relationship to some of 

 the following species. 



11. E. corymbosum, Nutt. Scabrous-hirsute and somewhat hoary with short 

 spreading pubescence : stems clustered, erect, a span to a foot or more high, corym- 

 bose at the summit, bearing several pedunculate heads : leaves linear or linear- 

 lanceolate, acute, tapering to the base, about 2 inches long: involucre canescently 

 hirsute (2 or 3 lines high), formed of nearly equal scales : rays 30 or 40, violet or 

 purple, slender : the short bristles of the outer pappus rather manifest. Torr. & 

 Gray, Fl. ii. 178. 



Eastern slope of Providence Mountains, Dr. Cooper. Incomplete specimens, perhaps not of 

 this species, which belongs much further north, in the interior of Oregon, &c., but may be 

 expected along the northeastern borders of the State. The hoary pubescence principally, and 

 probably insufficiently, distinguishes this from E. decumbens, Nutt., of Oregon, which, in turn, 

 nearly approaches the next. 



12. E. foliosum, Xutt. Sparsely and minutely scabrous-hirsute, or nearly gla- 

 brous : stems erect from a creeping rootstock, one or two feet high, corymbosely 

 branched above, bearing several short-peduncled heads : leaves numerous to the 

 summit, either broadly or narrowly linear, obtuse' (from an inch to at most 2 inches 

 long, and from 2 lines to half a line wide), the lowest sometimes spatulate : invo- 

 lucre varying from minutely hirsute to glabrous (3 lines high), the narrow scales 

 unequal : rays 30 or 40, narrow, purple-blue or white (sometimes none) : short 

 bristles of the outer pappus present, but inconspicuous. Nutt. in Trans. Am. Phil. 

 Soc. n. ser. vii. 309, & PI. Gamb. 177. E. Dourjlasii, Torr. & Gray, Fl. ii. 177. 

 Diplopappus (?) occidentalis, Hook. & Arn. A broader-leaved form with conspicu- 

 ous, purple rays is the type of this polymorphous species. The extreme forms to be 

 noted as varieties are 



