376 COMPOSITAE. Vor. III. 
16. CHRYSOTHAMNUS Nutt. Trans. Am. Phil. Soc. (II) 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 
campanulate, its bracts more or less keeled, thin, or papery, impricated 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 pubescent. 
Pappus of copious capillary roughened bristles. [Greek, golden-bush.] : 
About 30 species, natives of western North America. Type species: Chrysothamnus pumilus Nutt. 
Heads about 6” high; involucral bracts obtuse or mucronulate. 1. C. graveolens. 
Heads 7-10” high; involucral bracts subulate-tipped. 2. C. Howardi. 
1. Chrysothamnus gravéolens( Nutt.) 
Greene. Fetid Rayless Golden- 
rod. Fig. 4204. 
Chrysocoma graveolens Nutt. Gen. 2: 136. 
1818, 
Bigelovia graveolens A. Gray, Proc. Am. Acad. 
8: 644. 1873. 
Chrysothamnus graveolens Greene, Erythea 3: 
108. 1895. 
Wai 
AN 
Sparingly tomentose above, or glabrate, 
much branched, very leafy, 1°-43° high, 
odorous. Leaves linear, 1-3’ long, 1-2” 
wide; heads 5-6” high, very numerous and 
crowded in terminal compound corymbose 
cymes; rays none; involucre narrowly cam- 
panulate, acute at the base, its bracts oblong 
or linear-oblong, acute or acutish, imbri- 
cated in about 4 series; achenes linear; 
pappus-bristles soft, copious. 
In sterile, especially alkaline soil, Montana 
to western Nebraska, Utah and New Mexico. 
Included in our first edition in the C. nauseosa 
(Pursh) Britton, a densely tomentose far 
western species. Rabbit-brush. Aug.—Oct. 
2. Chrysothamnus Hoéwardi (Parry) 
Greene. Howard’s Rayless Golden- 
rod. Fig. 4205. 
Linosyris Howardi Parry; A. Gray, Proc. Am. 
Acad. 6¢ sat. 4865, 
Bigelovia Howardi A. Gray, Proc. Am. Acad. 8: 
641. 1873. 
Chrysothamnus Howardi Greene, Erythea 3: 113. 
1895. 
Similar to the preceding species, white- 
tomentose when young, glabrous or nearly so 
' when old, tufted, much branched, 6’-10’ high. 
Leaves narrowly linear, entire, 1’-2’ long, 
about 1” wide; heads 7-10” long, narrow, 
5-flowered, more or less glomerate, usually 
surpassed by the upper leaves; rays none; 
involucre slightly arachnoid-pubescent, its 
bracts lanceolate, thin, acuminate or subulate- 
tipped; achenes nearly linear, pubescent. 
In dry soil, western Nebraska to Wyoming, 
Colorado, Utah and New Mexico. July-Sept. 
