178 COMPOSITiE. Erigeron. 



and acute, not very numerous, but somewhat in 3 series, rather unequal ; 

 the inner whitish, with a brownish mid-nerve, nearly glabrous. Inner 

 pappus of few (15-20) bristles ; the exterior fewer and very small. 



32. E. decumhens (Nutt.) : scabrous-pubescent; stems slender, decumbent 

 or ascending, glabrous at the base, leafy, numerous from the same root, 

 somewhat branched or corymbose at the summit; the branches bearing single 

 heads ; leaves linear, entire, acute ; the lower somewhat lanceolate, tapering 

 into a petiole ; rays (white, Nutt.) more than twice the length of the linear 

 hairy and rather loose scales of the involucre ; exterior pappus minute. — 

 Nutt..' in trans. Amcr. phil. soc. {n. s;r.) l.j). 309. 



Rocky Mountains towards the Oregon, Nuttall ! Wahlamet, Douglas ! — 

 Stems more slender than in E. corymbosum, 10-15 inches long; the whole 

 plant scabrous-pubescent, not hoary, leafy nearly to the summit. Leaves 

 2-3 inches long, often less than 2 lines wide ; the lower attenuated into 

 slender petioles. Heads as large as a Daisy, on slender peduncles. Scales 

 of the involucre narrow, acute, nearly in a single series. Rays 40-50, in a 

 single series. 



33. E. corymhosum (Nutt.) : canescently pubescent throughout ; stems 

 numerous from the same root, erect, bearing few (3-5) corNmibose heads at 

 the summit ; leaves lanceolate-linear, entire, acute, sessile ; the radical lan- 

 ceolate or slightly spatulate, tapering into a petiole ; rays (blue) about twice 

 the length of the lanceolate canescent appressed scales of the involucre ; 

 achenia minutely hairy ; exterior pappus sqnamellate-setaceous, very dis- 

 tinct. — Nutt. ! in trans. Amcr. pliil. soc. {n. ser.) 7. ^?. 308. 



Rocky Mountains, in about lat. 42°, towards Oregon, Nuttall ! — Plant 

 6-8 inches high, rather stout, hoary with a close and short ])ubescence. 

 Leaves rather rigid, strongly 1-nerved, 1-3 inches long, about 2 lines wide. 

 Heads middle-sized, on naked peduncles. Scales of the involucre in about 

 2 nearly equal series, appressed, hirsute-canescent. Rays 30 or more, in a 

 single series. Pappus somewhat brownish ; the exterior rather copious, 

 shorter than the 2-3-nerved compressed achenia. — Habit of Chrysopsis, and 

 with a similar exterior pappus. 



34. E. ochroleucum (Nutt.) : somewhat cfespitose, low; stems numerous 

 from a thickened caudex, simple, slender, naked above, pubescent with ap- 

 pressed hairs ; bearing soUtary or rarely 3-5 heads; radical leaves crowded, 

 very narrowly linear, tapering into a petiole ; the cauline few or scattered, 

 sessile ; rays (ochroleucous, Nxdt.) scarcely twice the length of the pubes- 

 cent-tomentose linear-lanceolate scales of the involucre ; achenia somewhat 

 pubescent ; exterior pappus squamellate-subulate, very distinct. — Nutt. ! in 

 trans. Amer. phil. soc. {n. ser.) 7. p. 309. Diplopappus linearis, Hook. Ji. 

 Bor.-Am. 2. p. 21. (ex descr.) Chrysopsis hirtella, DC. prodr. b. p>- 327 .'' 



Plains of the Oregon, Nuttall! On dry rocks and sandy grounds near 

 • Priest's Rapid,' and on Lewis River. Douglas ! Aug. — Stems 3-5 inches 

 high, often simple and scape-like, leafless above and bearing a single head ; 

 frequently more leafy and bearing 3 or 4 heads on naked peduncles. Leaves 

 clustered at the base, slender, 2-3 inches long, rather rigid, slightly dilated 

 upwards or near the apex, or somewhat spatu late-linear, half a line to scarce- 

 ly a line in width, resembling an Armeria, nearly glabrous when old, at first 

 clothed with slender appressed hairs: cauline leaves nearly similar, but 

 sessile, often almost filiform. Heads as large as in E. alpinum. Scales of 

 the involucre nearly equal and somewhat in a double series. Rays 60 or 

 more, in a single series. Inner pappus of few bristles. — This is without 

 much doubt the Diplopappus linearis of Hooker, and the Chrysopsis hirtella 

 of De CandoUe (described from imperfect specimens) : having yellowish- 

 white rays (according to Nuttall,) it certainly closely approaches Chrysopsis. 

 The style, receptacle &c. agree with Erigeron. 



