356 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Sivisia section Gcraea Gray, PI. Fendl. So (1849). 



EnccUa section Gcraea Benth. & Hook. fil. Gen. PI. ii . o7S (1873). 



* Heads radiate; involucral scales linear, densely ciliate; lower leaves nar- 

 rowed to a petiolar base. 



1 . G. CAXESCENS ToiT. & Grjiv. Erect annual, 1-6 dm. high, simple 

 or branched from the base, hirsute with white hairs intermixed with 

 stalked glands; leaves lance-oblong, ovate, or obovate, narrowed to a 

 margined base, 1-7 cm. long, 0.3-0.4 cm. wide, acute, 3-nerved, bluntly 

 or acutely toothed mostly above the middle, those of inflorescence 

 bracteiform, all alternate or rarely one or two pairs of opposite ones 

 at base of stem; heads few, somewhat panicled, terminating branchlets 

 or long-peduncled from the upper axils, 5 cm. in diameter when well 

 developed; involucre 8-12 mm. high, 2-3-rowed; the scales subeciual 

 or the outer a little shorter, linear-lanceolate, glandular on the back, 

 3-nerved inside, densely ciliate except at tip w^ith long white hairs; 

 rays 10-14, golden yellow, cimeate, subentire or tridentate, 11-21 mm. 

 long, 6-11 mm. wide, the tube hairy; disk-corollas 6 mm. long, with 

 short glandular-hairy tube and cylindric-funnelform throat; pales 

 9_mm. long, fimbriate-margined, glandular-hairy toward the narrowed 

 apex; achenes narrowly cuneate, 6-7 mm. long, silky- villous, with 

 flattened denticulate awns half their length, the body black, the narrow 

 white margin continuous with the awns and the thick entire yellowish 

 crown. 



Gcraea cancscens Torr. & Gray, 1. c. (1847). 



Simsia (Gcraea) cancscens Gray, PI. Fendl. 1. c. (1849). 



EnccUa crioccphala Gray, Proc. Am. Acad. viii. 657 (1873). 



Specimens examined: Utah: southeastern part, 1870, Palmer (X); 

 Nevada: El Dorado Canon, Lincoln Co., Jan.-Apr. 1895, Lyra Mills 

 12 (N); valley of the Virgin River, 6 May 1891, V. Bailey (Death 

 Valley Exp. no. 1911 : N) ; California: Furnace Creek Canon, Funeral 

 Mts., alt. 100 m., Feb. 1891, Coville & Fvnsion 361 (N); 8 miles N. 

 of Salton Sea, Apr. 1910, Mrs. C. H. Everhart 2 (F); Palm Springs, 

 alt. 150 m., 19 Apr. 1907, S. B. Parish 6079 (F); The Needles, 3 May 

 1884, Jones 3783 (FN); Agua Caliente, Mar. 1881 and Apr. 1882, 

 Parish Bros. 228 (FN); Agua Caliente, W. G. Wright (G); Colorado 

 Desert, Apr. 1889, Orcvit (N) ; same locality, Wright (FN) ; loose soil, 

 near Calexico, 28 Mar. 1903, Abrams 3153 {G); in sandhills, Jan., Ft. 

 Yuma, Schott (G); diluvial banks of the Colorado near Ft. Yuma, 

 Schott (F); Colorado River, Neivberry (G); interior of California, 

 Fremont 393 of 1844, Coulter 304 (cotypes in Gray Herbarium); 



