CATALOGUE. 149 



Townsendia steigosa, Nutt. — Valley of the Upper Arkansas, Colo- 

 rado (517, 853). 



Townsendia scapigeka, D. C. Eaton (Vol. V of Fortieth Parallel Sur- 

 vey, p; 145, pi. xvii, figs. 1-7). — Nevada. 



Astee tanacetifolius, H. B. K. (Machcer anther a tanacetifolia, Nees.)— 

 Biennial, erect, 6'-2° high, usually much branched, pubescent or viscid, 

 or sometimes nearly glabrous ; leaves once to three times pinnatifid, the 

 divisions bristle-tipped ; involucre hemispherical, 3-8" in diameter ; scales 

 imbricated in several series, lanceolate or linear, always acute, and some- 

 times with very long, tapering, herbaceous tips ; rays about 25, violet, 

 twice as long as the disk-flowers ; achenia with two strong marginal ribs, 

 and several on either face, very villous ; mature pappus reddish. — Colorado 

 (854, 491, 505, 19). Also from Arizona and New Mexico. 



Aster canescens, Pursh. (Machcercmthera canescens, Gray ; also Eaton 

 in Bot. King.) — Very variable, and obtained by the Expedition from Colo- 

 rado, Arizona, New Mexico, Nevada, and Utah. 



Aster Coloradoensis, Grray. (Proc. Amer. Acad, xi, 76.)— 420 and 455 

 of the Colorado collection, in which it was distributed as Machcercmthera 

 canescens. Stems 2-4' high, several from the same root, each terminated by 

 a single head, tomentose or canescent ; leaves coriaceous, the lowest spatu- 

 late, the upper lanceolate or linear, all sharply serrate, having the teeth 

 bristle-pointed ; involucre hemispherical, the acute herbaceous-tipped scales 

 narrowly lanceolate, canescent, and in 2-3 series ; rays 35-40, large, 

 bright purple ; achenia ribbed, turbinate, and densely canescent or villose ; 

 pappus rusty-colored. 



Prof. T. C. Porter raises the question as to whether this may not be 

 Dieteria pulverulenta, Nutt. I have not access to authentic specimens of 

 this ; but there certainly are many strong resemblances from the descrip- 

 tion in Flora of North America by Torrey and Gray. See vol. 2, p. 101. 

 Unlike the others of the same section, this (Aster Coloradoensis) is perennial. — 

 Plate VII, B. Natural size. 9. Ray-flower. 10. Ray-flower style and 

 stigma. 11. Disk-flower. 12. Disk-flower style and stigma. 13. Ache- 

 nium and pappus of disk-flower. About 10 diameters. 



