﻿COMPOSITE. 



Grassy plains of the Plai 



)ecies is distinguished by its mostly naked and slightly' pubescent scape, 



s only to be distinguished by t 



dichotomous, with minute bracts at the divisions; scales o 

 volucre about 12, linear; the calvculate scales minute; ac 

 angled, smooth, slightly attenuated towards the apex, as lon| 

 — Crepidium glaucum, Nutt. ! in trans. Amer. phil. soc. I. c 



di^ion -Crepidium f^TlScens'NutfT ^''^ ^ 



Plains of the Upper Piatte,' Nuttaiu ' Lieut. Fremont 

 Scapes about a foot high. Heads much smaller than in C. 

 30-flowered. Le. ' ■ ' 



turaceous pubescence; cauline leaves few, sessile, pinnately parted, with the 

 hn ear or lanceolate lobe^ often soniewhat toothed; the radical lanceokte, 



intermixed; the calyculate scales few and very^shorf; achenia fusiform, not 

 angled or striate, as long as the pappus.— JV««. in jour. acad. Philad. 7. 

 p. 29. Psilochcena occidentalis, Nutt. ! in trans. Amer. phil. soc. I. c 



On the Oregon, near the Rocky Mountains, Mr. Wyeth ! Plains of the 

 Platte, Nuttall !—A span high. Heads as large as in C. runcinata, about 

 20-flowered. Achenia probably all fertile, tapering to the apex, not rostrate. 

 Pappus grayish-white. 



§ 2. Involucre few-flowered, cylindrical ; the exterior calyculate scales very 

 short and oppressed : receptacle naked: achenia slender, 5-10-striate.— 

 Phscasium, Cass., Reichenb. (Crepis § Leptotheca, Nutt.) 



petioled leaves; achenia linear, narrowed at the apex, scarcely rostrate.-- 

 Richards J appx. Frankly journ. ed. 2. p. 92 ; Hook. ! appx. Parrjfs 2nd 



Sibi?.2. p!i 



2 Sj-3. Prenanthes pygmaea, Ledeh. in 7nem. acacl. 

 St. Petersh. 5. p. 553. P. polymorpha, Ledeb. ! ft. Alt. 4. p. 144. {a. Sf^.) 

 Barkh^mmnaua, DC' prodr. 7. p. 1.56. ^ 



Mountains! (Also in Arctic Siberia !)— Scapes and leaves an inch or two in 

 height ; the lamina of the inner leaves often oblong-Unear. Corolla yellow, 

 turning purplish in drying. Achenia all uniform, or the central perhaps a 

 little longer than the marginal, 10-striate, a little constricted at the apex, and 

 then dilated mto a disk that bears the pappus : certainlv none of them ros- 



