170 COMPOSITiE. Erigeron. 



Franklin on the Mackenzie River, Richardson ! Drummond ! Rocky Moun- 

 tains in about lat. 42^, Nuttall ! — Plant from 4-6 inches to 2 feet high. — Our 

 specimens from the north of Europe very well accord with the American 

 plant. 



13. E. nivale (Nutt.): stems somewhat cfespitose and hairy at the base, 

 mostly bearing single heads ; radical leaves spatulate ; the cauline lanceo- 

 late, acuminate, somewhat clasping ; involucre and the summit of the stem 

 glandularly pubescent; the scales linear and acuminate (not hirsute) ; pappus 

 longer than the linear elongated somewhat pubescent achenium. Nutt. in 

 trans. Amer. jMl. soc. {n. ser.) l.ii. 311. 



Central chain of the Rocky Mountains, lat. 42°, towards the sources of the 

 Colorado of the West ; near the limits of perpetual snow, Nuttall. — "Allied 

 to A. alpinus, but with subamplexicaul leaves, widest at the base. Pappus 

 longer than the involucre. Rays? A few filiform pistillate florets outside 

 the discal ones. Achenium long and linear, compressed, slightly silk}^." 

 Nutt. — We have not examined this species, which is founded, we believe, on 

 a single specimen. We see not how it is to be clearly distinguished from 

 some states of Hooker's E. alpinum, in which the upper cauline leaves are 

 often broadest at the base. 



• * ♦ Stem leafy at ike base, elongated and scape-like above, bearing a single head : 

 pistillate Jioirers all ligulate. 



14. E. scaposum (DC.) : stem decumbent and leafy at the base, naked 

 and much elongated above, pubescent ; leaves hirsute with appressed hairs, 

 lanceolate-oblong or spatulate, coarsely toothed ; the radical ones crowded, 

 somewhat petioled ; tliose of the sterile branches or lower part of the flower- 

 ing stems lanceolate, partly clasping ; rays very numerous, about twice the 

 length of the canescently hirsute involucre ; achenia hirsute. — DC. prodr. 5. 



p. 287 ; Benth. ! pi. Hartw. p. 17. Aster rivularis, Less, in Linncea, 5. 

 p. 142. 



Rio Brazos, Texas, Drummond! Also Texas, Mr. Callana ! — Scape or 

 naked summit of the stem 4-7 inches long. Rays apparently white. — The 

 Texan plant accords with that of Hartvveg from the north of Mexico ; and 

 also with a specimen from Jalapa, received from Prof. Schlechtendal, under 

 the name of Aster rivularis, Less. 



* * ♦ * Stem leaf y : heads mostly corymbose or panided : pistillate Jlowcrs all ligulate. 



15. E. Bellidiastrum (Nutt.) : annual ; stem leafy throughout, somewhat 

 corymbosely branched, hirsute-pubescent ; leaves entire, oblong-linear or 

 linear-spatulate, obtuse, tapering to the base, the lower petioled ; heads soli- 

 tary terminating the branches, pedunculate; rays (pale red) nearly twice the 

 length of the involucre, scarcely in a double series; achenia minutely pubes- 

 cent. — Nutt. ! in trans. Amer. phil. soc. {n. ser.) 7. p. 307. 



Borders of the Platte, within the Rocky Mountains, Nuttall! — Stem about 

 a foot high. Leaves more or less pubescent, 1-2 inches long, 2-4 lines wide, 

 tapering into a slender narrowed base, or the lowermost with attenuate pe- 

 tioles, thickish, more or less pubescent. Heads few, small. Scales of the 

 involucre somewhat strigose-canescent. Pappus simple, of 15-20 very slen- 

 der deciduous bristles, rather shorter than the corolla. 



16. E. bellidifolium (Muhl.) : stoloniferous at the base, hirsute, especially 

 when young, with soft spreading hairs ; radical leaves obovate or broadly 

 spatulate, somewhat serrate or entire ; the cauline (often few and distant) oblong 

 or lanceolate-oblong, partly clasping, mostly entire ; heads few (1-5, rarely 

 7-9) and large, corymbose; the lateral pedicels elongated ; rays (about 50) 

 rather broadly linear, scarcely in a double series, twice the length of the in- 

 volucre, light bluish-purple ; achenia glabrous. — Muhl.! in Willd. spec. 3. 



