C. NAUSEOSUS. 215 



Junction, August 27, 1896, Greene (Herb. Greene, type of C.falcatus Greene, minor var- 

 iation 33) ; vicinity of Farmington, New Mexico, Slandley 6884 (US) ; Adamana, Arizona, 

 Hall 11164 (UC); Green River, Utah, Jones 516 (UC); Sierra La Sal, Utah, Purpus 7071 

 (UC); mesa west of Pocatello, Idaho, Eggleston 9936 (US). 



\2k. Chrysothamnus nauseosus pinifolius (Greene). — Shrub of medium size (6 to 

 15 dm. high), taller than broad, with erect branches; twigs slender, erect, leafy, striate, 

 green with a closely packed tomentum (rarely white and non-striate) ; herbage with a 

 disagreeable odor; leaves linear-filiform, 3.5 to 6 cm. long, 1 mm. or less wide, 1-nerved, 

 green to grayish puberulent, often densely tomentulose beneath; inflorescence a thyrsoid 

 panicle of rounded or pyramidal outline, varying to short-oblong; involucre 6 to 8 or 

 rarely 9 mm. long; bracts acute, keeled, in vertical rows, glabrous; corolla 6.5 to 9 mm. 

 long; tube puberulent or glabrous; lobes 0.5 to 1 mm. long; style-appendage longer than 

 stigmatic part; achenes densely pubescent. (C pinifolius Greene, Pittonia 5:60, 1902.) 

 Alkaline plains and plateaus, Colorado, New Mexico (and Utah?). Type locality, 

 Gunnison, Colorado. Collections: Type collection, September 1, 1896, Greene (Herb. 

 Greene) ; Alamosa, San Luis Valley, Colorado, Hall 10784a (UC) ; lola, region of the Gun- 

 nison watershed. Baker 668 (Gr, NY, US) ; Doyles, west central Colorado, Baker 629 (Gr, 

 NY, UC, US, twigs green in one specimen, white in another) ; above Datil, New Mexico, 

 Wooton 2494 (DS, Gr, NY, UC); White Mountains, Lincoln County, New Mexico, 

 W colon 379 (Gr, Greene, UC, US, t3rpe collection of C. confinis, minor variation 30). 



12/. Chrysothamnus nauseosus consimilis (Greene). — Shrub commonly 6 to 15 dm. 

 high, taller than broad, with erect branches; twigs erect, very leafy, striate, green, with a 

 closely packed tomentum; herbage with a strong disagreeable odor; leaves nearly filiform, 

 2.5 to 5 mm. long, less than 1 mm. wide, 1-nerved, somewhat resinous and canescently 

 tomentulose to nearly glabrous; inflorescence an elongated pyramidal or cylindric thyrsus; 

 involucre 7 to 8 mm. high; bracts acute, keeled, in fairly distinct vertical rows, glabrous; 

 corolla 7 to 8.5 mm. long; tube glabrous or only puberulent; lobes linear, 1 to 2 mm. long, 

 spreading in age; style-appendages longer than the stigmatic part; achenes densely 

 pubescent. (C. consimilis Greene, Pittonia 5:60, 1902.) Alkaline valleys and plains, 

 western Wyoming and Colorado to New Mexico, northern Arizona, Nevada, northeast- 

 ern California (and one collection from San Diego County), eastern Oregon, and Idaho. 

 Type locality, Deeth, Elko County, Nevada. Collections: Evanston, Wyoming, Nelson 

 4105 (Gr, NY, R, UC, US, type collection of C. oreophilus Nelson, minor variation 61); 

 Marysvale, Utah, Jones 5966 (UC, US) ; Tooele Valley, Utah, Jones 502 (UC) ; eastern 

 base San Francisco Mountains, Arizona, Hall 11180 (UC); type, August 7, 1895, Greene 

 (Herb. Greene); Goldfield, Nevada, Hall 10808 (UC); Fallon, Nevada, Heller 10679 

 (DS, Gr, NY, UC, US); California: Tantillas Mountains, San Diego County, 1875, 

 Palmer (Gr); Bridgeport, Mono County, Hall 10866 (UC); Shasta Valley, Heller 12978 

 (DS, SF, UC); near Alturas, Modoc County, 1894, Austin (Herb. Greene, type of C. 

 angustus, minor variation 21); Lake County, Oregon, Leiberg 769 (UC); Boise, Idaho, 

 Clark 317 (Gr, NY, UC, US, type collection of C. oreophilus artus Nelson, minor 

 variation 62). 



12m. Chrysothamnus nauseosus viridulus (Hall). — Shrub 5 to 20 or even 30 dm. 

 high, robust, taller than broad, with ascending branches; twigs erect, leafy, rather stout, 

 striate, densely covered with pannose yellowish-green smooth tomentum; herbage mal- 

 odorus; leaves (at first erect or ascending, later inclined to droop) narrowly linear, acute, 

 3 to 5 cm. long, about 1 mm. wide, 1-nerved, channeled above, green but tomentulose on 

 both sides; inflorescence a pyramidal to nearly globose thyrse; involucre 6.5 to 8.5 mm. 

 high; bracts acute except the obtuse inner ones, keeled, in 5 vertical ranks, glabrous but 

 viscid with a resinous exudation; corolla 7 to 9.5 mm. long; tube glabrous or sparsely 



