﻿COMPOSITE. 



190. LYGODESMIA. Don, in Edinb. phil. jour. 6. p. 305 (excl. spec.) ; 

 HooTc.fl. Bor-Am. \.p. 295; DC. 

 Lygodesmia & Erythremia, Nutt. 

 Heads 5-10-flowered. Involucre elongated cylindrical, of 5-8 linear scales 

 in a single series, and calyculate with a few very short imbricated bracteolate 

 scales. Receptacle scrobiculate. Branches of the style much exserted. 

 Achenia linear, elongated, somewhat cylindrical, striate, smooth, not contracted 



bristles,^in many^Lries, raLr^rsistent.— Perennial glabrous and ^some^ 

 what glaucous rigid branching herbs (natives of sterile plains chiefly beyond 



Heads solitary terminating the stem or branches, erect- Flowers reddish- 

 purple or rose-color. 



This genus differs from Prenanthes and Nabalus rather in its striking habit than 



§ 1. Heads b-fiowered: pappus soft: stems very much branched, no^ spines- 



Cen<.— EULTGODESMIA. 



1. L. juncea{Donl I.e.): stems very much branched, striate; lower 

 linear-sublanceolate, rigid ; the upper subulate.— flbo^. .' Jl. Bor.-Am. 1. 

 p. 295, t. 103 ; DC. prodr. 7. p. 198. Prenanthes juncea, Pursh ! jl. 2. 

 p. 498 ; Nutt. ! gen. 2. p. 123. 



Plains of the Missouri and Platte to the Rocky Mountains, LevAs? Nut- 

 tall! Dr. James! Lieut. Fremont ! and of the Saskatchawan, Drummond! 

 May-June.— About a foot high. Lower leaves 1-2 inches long. Flowers 



Hoo^ker.''''pappus°extr^^^ IhyoTsIender 



2. L. spinosa (Nutt.) : stem and bi 

 scales' of the"" rather short cylindracec 



^ Plains of the Rocky Mountains towards California, Nuttall .'—A span to^a 



producing remarkably large tufts of brownLh*^^^atte? down." Nutt- 

 Flowers rose-red. Pappus less copious and more rigid than in the preceding, 

 by no means barbellate, as described by Nuttall, but appearing very sUgbtly 

 acabrous under a good lens. Mature achenia not seenf 



