Erigeron. • COMPOSITE. 173 



brought from California or Oregon by Mr. Menzies; whose dried specimens, 

 we may remark, ahnost entirely agree with the cultivated E. glaucum. 



20. E. 7nacranthum {Null.): nearly glabrous; stem leafy to the summit; 

 leaves glabrous, with hispidly ciliale margins, obtuse, mucronulate ; the 

 upper oblong-ovate or elliptical, partly clasping ; the lowermost oblong-spa- 

 tulate, tapering into a petiole ; heads few (3-5) on simple naked peduncles ; 

 rays numerous, twice the length of the glabrous and slightly glandular invo- 

 lucre ; achenia slightly hairy, 2-nerved. — Nutt.! in trans. Amer. phil. soc. 

 (n. ser.) 7. p. 310. 



/?. leaves very acute; heads larger. — E. grandiflorum, Nutt..' in jour. 

 acad. Philad. 7. p. 31, not'of Hook. 



Sources of the Missouri, and plains of the Platte, near the Rocky Moun- 

 tains, Mr. Wyethl Nuttall! Aug. — Leaves thickish, reticulated; the upper 

 about an inch long and half an inch wide. Heads smaller than in E. spe- 

 ciosum ; the rays blue, fewer in number. Involucre glabrous to the naked 

 eye, minutely glandular under a lens. — The variety with acute leaves ap- 

 proaches E. speciosum, from which, indeed, i» appears to be distinguished 

 chiefly by its glabrous involucre. 



21. E. speciosum (DC.) : stem glabrous below, much branched and 

 sparsely hispid above, leafy to the summit; leaves lanceolate, mostly acute 

 or acuminate, entire, hispidly ciliate, closely sessile or somewhat clasping ; 

 the radical ones spatulate and tapering into a petiole ; heads corymbose, ter- 

 minating the leafy branchlets ; rays very numerous (about 120), nearly 

 thrice the length of the very narrow hispid setigerous-mucronate scales of 

 the involucre; achenia minutely hairy, 2-4-nerved. — DC! prodr. b. p. 284, 

 ^7. {mant.) p. 274. Stenactis speciosa, Lindl. ! bot. reg. t. 1577; HooTc. 

 hot. mag. t. 3607. 



/3. stem often simple, bearing few heads ; leaves narrowly lanceolate, 

 cuspidate-acuminate. — E. speciosum, Nutt.! in trans. Amer. pJiil. soc. I. c, 

 chiefly. E. glabellum y. mucronulatum, Hook. ! Jl. Bor.-Am. 2. pi- 19- 



California and Oregon, Douglas ! /3. Plains of the Oregon, common, 

 Dr.Scouler! Douglas! Nuttall! — Stem tall and stout, furrowed. Leaves 

 often nearly glabrous, except the margins, 2-4 inches long. Heads (includ- 

 ing the showy violet-purple ray) nearly 2 inches in diameter. Scales of the 

 involucre attenuate, hispid with spreading whitish hairs. Achenia 2-3- 

 (soraetimes 4-) nerved. Pappus with short setsB intermixed at the base, 

 forming an indistinct exterior series. 



22. E. glabellum (Nutt.) : stem simple, or sparingly branched and some- 

 what naked above, pubescent or nearly hispid towards the summit ; leaves 

 mostly glabrous, with cihate and scabrous margins, entire; the upper cauline 

 (small) lanceolate or oblong-lanceolate, acute or mucronate-acuminate, 

 closely sessile or partly clasping ; the lower and radical ones spatulate, with 

 a long tapering base or margined petiole ; heads 3-7, corymbose ; the pe- 

 duncles naked, thickened at the summit; rays very numerous (more than 

 100), twice the length of the narrowly linear acute canescently hispid scales 

 of the involucre ; achenia sparsely hispid, nearly glabrous wlien mature, 

 2-3-nerved. — Nutt! gen. 2. p. 147, Sf- in jour. acad. Philad. 7 . p. Ii7 ; 

 Richards, appx. Frankl. journ. ed. 2. p. 30 ; Hook. ! bot. mag. t. 2923, Sf 

 jl. Bor.-Am. 2. p. 19 ; DC. ! I. c. (Varies, 1. with the radical leaves lan- 

 ceolate, sometimes toothed ; the cauline linear ; head often solitary : 2. stem 

 stout ; leaves larger ; heads larger, 7-10, in a simple or slightly compound 

 corymb.) 



/3. asperum : stem and leaves rough with a strigose-hirsute pubescence 

 (rays nearly white ?). — E. asperum, Nutt.! gen. 2. p. 147 ; DC. prodr. 5- 

 p. 286. (E. i)ulchpllus, a. Hook. Jl. Bor.-Am. 2. p. 19 (excl. syn.), fide herb. 

 Greene, ^-herb. Torr.) 



