326 



COM POSIT AE. 



[Vol. III. 



Chondrophora nudata virgata (Nutt. ) BriUon, Mem. Torr. Club, 5: 317. 1894. 

 Chrysocoma inrgala Nutt. Geii. 2: 137. 1818. 

 liigelovia niidala var. virgata T. & G. Fl. N. A. 2; 232. 1S41. 

 Chondrophora virgata Greene, Erj'f'ea, 3: 91 ■ 1895. 



Lower leaves linear, shorter, or the basal ones linearspatulate. Perhaps specifically distinct. 

 With the type, southward, not certainly known from within our territory. 



16. CHRYSOTHAMNUS Nutt. Trans. Am. Phil. Soc. 629. 7: 323. 1840. 



Low shrubs, with equably leafy branches, hard wood, linear leaves, and discoid heads 

 of yellow perfect flowers. Heads narrow, 5-7-flowered. Involucre oblong to narrowly 

 canipanulate, its bracts more or less keeled, thin, or papery, imbricated in several series, 

 often so as to form 5 vertical rows. Corolla 5-toothed. Anthers obtuse at the base. Style- 

 branches exserted, their appendages subulate to filiform. Achenes narrow, mostly pubes- 

 cent. Pappus of copious capillary roughened bristles. [Greek, golden-bush.] 



About 25 species, natives of western North America. 

 Heads about 6" higth; involucral bracts obtuse or mucronulate. i. C. nauseosa. 



Heads 7"-io" high; involucral bracts .subulate-tipped. 2. C. Ho-uardi. 



I. Chrysothamnus nauseosus 



(Pursh) Britton. Fetid Rayless 

 Golden-rod. (Fig. 3662.) 



C. nauseosa Pursh, Fl. .-^m. Sept. 517. 1S14. 

 C. grai'eolens Nutt. Gen. 2: 136. 1818. 

 Bigeloz'ia grai'eolens A. Gray, Proc. \va. 



Acad. 8: 644. 1873. 

 Chondrophora nauseosa Britton, Mem. Torr. 



Club, 5:317. 1894. 



Densely white-tomentose, at least when 



young, much branched, very leafy, i°-6° 



high, odorous. Leaves linear, or slightly 



spatulate, i'-2' long, i"-2" wide; heads 



5"-S" high, very numerous and crowded 



in terminal compound corymbose cymes, 



ra3S none; involucre narrowly campanu- 



late, acute at the base, its bracts oblong 



or linear-oblong, acutish, puberulent, 



imbricated in about 4 series; achenes 



linear; pappus-bristles soft, copious. 



In sterile, especially alkaline soil. North- 

 west Territory to western Nebraska (') and 

 New Mexico, west to British Columbia and 

 southern California. Aug. -Oct. 



2. Chrysothamnus Howardi 

 (Parry) Greene. Howard'.s Ray- 

 less Golden-rod. (Fig. 3663.) 



Linosyris Ho-uardi Parry; A. Gray, Proc. 



Am. Acad. 6; 541. 1865. 

 Bigelovia Hoivardi A. Gray, Proc. Am. Acad. 



8: 641. 1S73. 

 Chrysothamnus Hoiuardi Greene, Erythea, 



3: 113- 1895. 



Similar to the preceding species, densely 

 white-tomentose when young, glabrous or 

 nearly so when old, tufted, much branch- 

 ed, 6'-io' high. Leaves narrowly linear, 

 entire, i'-2' long, about i" wide; heads 

 l"-\o" long, narrow, 5-flowered, more or 

 less glomerate, usually surpassed by the 

 upper leaves; rays none; involucre slightly 

 pubescent, or glabrous, its bracts lanceo- 

 late, thin, acuminate or subulate-tipped; 

 achenes nearly linear, pubescent. 



In dry soil, western Nebraska, Colorado 

 and Utah to New Mexico. July-Sept. 



