216 GENUS CHRYSOTHAMNUS. 



puberulent; lobes 1.7 to 2.5 mm. long, recurving in age; style-appendage longer than 

 the stigmatic part; achenes densely sericeous. (C nauseosus var. viridulus Hall, Univ. 

 Calif. Publ. Bot. 7:177, 1919.) Alkaline flats of west central Nevada and in eastern 

 California, from Mono County south to the desert side of the San Antonio Mountains. 

 Type locality, Benton, Mono County, California, on sandy alkaline flats with DistichKs, 

 at 1,720 m. altitude. Collections: Lida, Esmeralda County, Nevada, Hall 1081 i 

 (UC); California: north side Mono Lake, Hall 10846 (UC); type collection, November 3, 

 1917, Hall 10642 (UC) ; Antelope Valley, Hall 10580 and 10582 (UC, minor variation 59); 

 San Antonio Mountains, Johnston 1706 (UC) ; east of Bear Valley, San Bernardino Moun- 

 tains, August 20, 1907, Bailey (UC); and a large series mostly from Owens Valley, in 

 Univ. Calif. Herb. 



12n. Chrysothamnus nauseosus ceruminosus (Durand and Hilgard). — Shrub 5 

 to 12 dm. high, rounded, fastigiately branched; twigs erect, short-leafy, striate, yellowish- 

 green with a smooth compact tomentum; herbage scarcely odorous; leaves linear-filiform, 

 1 to 3 cm. long, less than 1 mm. wide, 1-nerved, tomentulose; inflorescence compactly 

 cymose, rounded, 2 to 3 cm. across; involucre 7 to 8 mm. high; bracts abruptly narrowed 

 to a filiform recurved mucro about 1 mm. long, keeled, somewhat ranked, glabrous and 

 glutinous; corolla about 6.5 mm. long; tube puberulent; lobes 1.5 to 2.0 mm. long; 

 style-appendages longer than the stigmatic part ; achenes densely pubescent. {Linosyris 

 ceruminosa Durand and Hilgard, Jour. Acad. Nat. Sci. Phila. II, 3:40, 1855; also Pacif. 

 R. R. Rep. 3:9, plate 6, 1857.) Mojave Desert, California, and mountains to the west. 

 Type locality, Tejon Pass, California. Collections: Type collection, September, 1853, 

 Heermann (Or, US); Hesperia, California, October, 1917, Spencer (UC). 



12o. Chrysothamnus nauseosus mohavensis (Greene). — Shrub of medium or large 

 size, usually 8 to 16 dm. high and with elongated straight stems; twigs erect or ascending, 

 often but not always nearly leafless and rushlike, striate, white or greenish-yellow ; leaves 

 filiform, very acute, 2 to 3 cm. long, 1-nerved, nearly glabrous; inflorescence a rounded 

 or somewhat elongated thyrse; involucre narrow, 9 to 10.5 mm. long; bracts obtuse to 

 acute, sharply keeled, in very distinct vertical ranks, glabrous; corolla 8 to 10 mm. long; 

 tube puberulent; lobes 1.5 to 2.5 mm. long, spreading; style-appendage longer than 

 the stigmatic part; achenes densely pubescent. (Bigelovia mohavensis Greene in Gray, 

 Syn. Fl. P:138, 1884.) In well-drained, scarcely alkaline soil, western part of the 

 Mojave Desert, north in the inner Coast Ranges to Mount Hamilton, all in California. 

 Type locality, Mojave Desert, California. Collections: Mojave Desert, July, 1884, 

 Brandegee (UC); Oak Creek, south of Mojave, Hall 10570 (UC, flowering twigs leafless 

 for 6 to 7.5 dm.); near Fort Tejon, 1,550 m. altitude, Rothrock 271 (Gr); Mojave Desert, 

 October 19, 1882, Pringle (Gr, US); Alamo Mountain, Ventura County, Baldwin 102 

 (UC); Rock Creek, desert slopes of San Gabriel Mountains, Abrams and McGregor 625 

 (DS); Priest Valley to Coalinga, San Benito County, Abrams 7685 (DS); Mount Hamil- 

 ton, Hall 9894 (UC). 



12p. Chrysothamnus nauseosus junceus (Greene). — Shrub of unknown size, strict, 

 fastigiately much branched; twigs slender, rush-like, mostly leafless, not striate, yellow- 

 ish-green with a smooth compact tomentum; leaves linear-filiform; inflorescence fastigi- 

 ate-cymose; involucre about 10 mm. high; bracts acute, 5 in each of the distinct vertical 

 rows, glabrous; corolla about 9 mm. long; tube pubescent but not arachnoid; lobes about 

 1.5 mm. long, externally beset with long delicate hairs; style-appendage longer than the 

 stigmatic part; achenes densely pubescent. {Bigelovia juncea Greene, Bot. Gaz. 6:184, 

 1881.) Known only from Arizona. Type locality, calcareous bluffs of the Gila River in 

 eastern Arizona, very near the New Mexican boundary. Collections: Type collections, 

 September 5, 1880, Greene (Gr, Jones, hairs on corolla-lobes wanting or deciduous in 



