212 ' GENUS CHRYSOTHAMNUS. 



(C. spedosus Nuttall, Trans. Am. Phil. Soc. II, 7:323, 1840.) Sandy and clayey slopes 

 and benches, where only moderately alkaline, Montana, Wyoming, and western Colorado 

 to Utah, eastern California, Washington, and Idaho. Type locality, in the Rocky 

 Mountain plains, near Lewis River. Collections: Type collection, Nuttall (Gr, Phila); 

 Fremont County, Wyoming, Goodding 521 (NY, UC) ; Woods Landing, Wyoming, Nelson 

 3477 (R, type of C. pulcherrimus Nelson, minor variation 68); North Elk Canon, Rio 

 Blanco County, Colorado, September 3, 1902, Sturgis (Gr, leaves 3 mm. wide, tomentum 

 dense and stopping abruptly with the outer involucral bracts exactly as in the type); 

 North Park, Colorado, Osterhout 2266 (NY) ; near Hebron, Colorado, Shear l^SJ^l (NY) ; 

 Parleys Canon near Salt Lake City, Utah, Jones 511 (UC); Ogden, Utah, September 28, 

 1917, Stilwell (UC); Fall Creek, Ormsby County, Nevada, Baker I4S6 (Gr, UC, SF, 

 minor variation 58); Mono Pass, California, Bolander 6145 (Gr, NY, US, same vari- 

 ation); Leevining Canon, Mono County, California, Hall 10852 (UC, same variation); 

 near Yreka, Siskiyou County, California, Butler 1824 (UC); Crater Lake, Oregon, 

 2,750 m. altitude, Heller 12945 (DS, SF, UC); near Echo, eastern Oregon, Leiberg 906 

 (DS, Gr, UC, tall, erect form with strongly pubescent involucres, minor variation 57); 

 Cow Creek, mouth of Doe Creek, Douglas County, Oregon, Ward 43 (NY, typical). 



12d. Chrysothamnus nauseosus latisqtjameus (Gray). — Shrub tall (perhaps 

 rounded at top) ; twigs erect or ascending, leafy to the summit, the striae obscured by a 

 white rather loose tomentum; herbage probably mildly fragrant; leaves 2 to 5 cm. long, 

 less than 1 mm. wide ; inflorescence a loosely branched rounded compound cyme; involucre 

 about 8 mm. high (7 to 9 mm.) ; bracts very obtuse (at least the inner ones), carinate, in 5 

 distinct vertical rows, outermost ones tomentulose, inner ones usually glabrous; corolla 

 about 8 to 9 mm. long ; tube short-pubescent or glabrous ; lobes ovate or short-lanceolate, 0.5 

 to 1 mm. long, erect; style-appendage longer than the stigmatic portion; achenes densely 

 pubescent. (Bigelovia graveolens var. latisquamea Gray, Proc. Am. Acad. 8:645, 1873.) 

 New Mexico, Arizona, and Sonora. Type locality. New Mexico. Collections : Type col- 

 lections, October 2, 1853 or 1854, Bigelow, and on the Mimbres, 1853, Henry (Gr); San 

 Lorenzo, Grant County, New Mexico, Metcalfe 1462 (DS, Gr, NY, US); Burro Moun- 

 tains, New Mexico, Rushy 202 (US); Santa Rita Mountains, Arizona, November, 1891, 

 Brandegee (UC, type collection of C. spedosus arizonicus Greene, minor variation 73); 

 Billings, Arizona, Jones 4511 (NY, US); Santa Cruz, Sonora, Mearns 2624 (US). 



12e. Chrysothamnus nauseosus albicaulis (Nuttall). — Shrub 5 to 10 dm. high, of 

 rounded outline; twigs erect, leafy to the top, not evidently striate, white with a per- 

 manent and dense tomentum; herbage not fragrant; leaves narrowly linear, 2.5 to 4 cm. 

 long, 0.5 to 1.5 mm. wide or up to 3 mm. wide in occasional forms, 1-nerved, permanently 

 and floccosely white-tomentose; inflorescence a rather loose round-topped cyme; invol- 

 ucre 7 to 9 mm. high; bracts mostly acute, plainly keeled, in 5 distinct vertical ranks, 

 white-woolly but not ciliate; corolla 8 to 10 mm. long; tube usually arachnoid with 

 long weak hairs; lobes lanceolate, 1.5 to 2 mm. long; style-appendage longer than the 

 stigmatic part; achenes densely pubescent. (C. spedosus I3. albicaulis Nuttall, Proc. 

 Am. Phil. Soc. II, 7:324, 1840.) Upland slopes and benches, most plentiful in the basin 

 of the Columbia River, extending into British Columbia, Montana, and Utah, also south- 

 ward in a wide-leaved form to middle Nevada and middle eastern California; occurs 

 mostly as scattered plants on areas where subspecies spedosus is more abundant. Type 

 locality, not specifically given, but probably in the valley of the Snake River, for the 

 habitat of C. spedosus is given by Nuttall as "in the Rocky Mountain plains, near 

 Lewis' River," and albicaulis is then described as a form of this, with no other locality 

 mentioned. Collections: Wawawai, Washington, Piper 1571 (Mo. Bot. Gard.); Prosser, 

 Yakima Region, Washington, Cotton 897 (Gr) ; near forks of Cottonwood Canon, eastern 



