302 COMPOSITE CHRYSOTHAMNUS. 



olate to linear, all but the innermost with conspicuous and spreading 

 mostly elongated-subulate foliaceous tips: rays 2-7, 3 or 4 lines long: disk- 

 flowers 10-16. Achenes soft-pubescent. In the mountains of eastern 

 Oregon and Washington to California. 



10 CHRYSOTHAMNUS Nutt. Trans Am ' hil. viii, 323. 



Perennial herbs or suffiuticose plants with linear or oblong 

 sessile alternate leaves and rather small corymbose heads of 

 yellow flowers. Heads 5-flowered, rarely 6- or 7 -flowered in- 

 volucre campanulate > its bracts imbricated mostly concave or 

 carinate, dry and chartaceous, destitute of green tips. Recep- 

 tacle flat, alveolate-toothed, the teeth fleshy or somewhat lacer- 

 ate. Co'oll-s narrow. S'yle branches with exs^'t d f-ubulite 

 or setaceous-filiform appendages. Achenes slender somewhat 

 compressed, silky villous. Pappus simple, of copious 

 capillary bristles. 



C. pumilus Nutt Trans. Phil. Soc. vii, 323. Bigelovia Douglaxii var 

 purnila <*ry. Branches erect, numerous, 6-10 inches high, glabrous, 

 very leafy: leaves g,n inch long or more, glabrous slightly glutinous, nar- 

 rowly linear, very acute, 3-nerved, often involute or occasionally some- 

 what twisted : involucre 2-3 lines high the bracts not very distinctly 4- 

 ranked, the outer short, ovate-lanceolate, the inner oblong-linear, not 

 acute, faintlv carinate Hrv plains eastern Washington to Montana and 

 Utah. 



C. puberulus Greene Eryth iii, 93. Bigelovia Don flasii , ••ar vubevnla 

 (-■rag. Puberulent to almost hispidulous throughout: branches numer- 

 ous, 0-10 inches high, very leafy : leaves narrowly linear very acute 10-15 

 lines long, 3-nerved : involucre 2-:> lines high, the br cts 4-ranked, the 

 outer ovate-lanceolate, the inner oblong-linear On desert plains, Idaho 

 to Utah and Nevada. 



C. viscidiiiorus Nutt. 1. c 324, Bigelovia Dotiglasi> <Jray >-hrub 2-0 

 feet high, fastigiately branched : leav s 2 inches long, nar ovvly linear, 

 very acute, rather firm, 3 nerved, their margins more or less distinctly 

 serrulate scabrous : heads numerous, in an ample fastigiate terminal cor- 

 ymb, 3-4 lines high : bracts of the involucre'linear-oblong, abruptly acute, 

 2-4 in each vertical rank. Plains of the l olumbia. 



C. speciosus Nutt. 1. c. Bigelovia. graveolens Gray in part. Shrub 

 2-4 feet high with rather slender stems terminated by an ample rather 

 open cymous corymb of yellow flowers,: leaves very narrowly linear and 

 branches of the inflorescence minutely white-tomentose : bracts of the in- 

 volucre firm acutish, not ciliate. tomentose on the back, at least near the 

 tip, in 3-4 vertical ranks: tube of the corolla slender, almost glabrous, 

 the limb rather deeply 5-lobed. Dry plains Washington to California 

 and Idaho. 



var albicaulis Nutt. I.e. Stems and branches densely lanate- 

 tomentose : tu e of the corolla clothed with long villous or somewhat 

 arachnoid hairs. Idaho. 



C. nanus Jplopappas nanus Eaton. A low branching heath-like 

 shrub 3-8 inches high, glabrous and somewhat glutinous : leaves crowded, 

 3-6 lines long, linear-spatulate. rigid channelled, acute and with minute 

 leaves fascicled in" their axils: heads small, cor mbed; involucre turbinate, 

 of numerous lanceolate carinate chartaceous bracts with searious margins, 

 very acute the outer ones small and passing into the leaves : rays 4-6, disk- 



