326 



COMPOSITAE. 



[Vol. III. 



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

 Chrysocoma virgata Nutt. Gen. 2: 137. 1818. 

 Bigelovia nudata var. virgata T. & G. Fl. N. A. 2: 232. 1841. 

 Chondrophora virgata Greene, Erythea, 3: 91. 1895. 



Lower leaves linear, shorter, or the basal ones linear-spatulate. Perhaps specificalty 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 flow T ers. Heads narrow, 5-7-fiowered. Involucre oblong to narrowly 

 campanulate, 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" high; involucral bracts obtuse or mucronulate. 1. C. nauseosa. 



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



i. Chrysothamnus nauseosus 



(Pursh) Britton. Fetid Rayless 



Golden-rod. (Fig. 3662.) 



C. nauseosa Pursh, Fl. Am. Sept.517. 1S14. 

 C. graveole?is Nutt. Gen. 2: 136. 1818. 

 Bigelovia graveolens A. Gray, Proc. Am. 



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, x'-i' long, i // -2 // wide; heads 

 5 // -8 // high, very numerous and crowded 

 in terminal compound corymbose cymes, 

 rays 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 Hozcardi Parry; A. Gray, Proc. 

 Am. Acad. 6: 541. 1865. 



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



8: 641. 1873. 

 Chrysothamnus Hozvardi 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 x" wide; heads 

 7 // -io // 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. 



