BLAKE. — ENCELIA AND RELATED GENERA. 353 



Aillous except for a submarginal naked border, narrowly white-mar- 

 gined, awnless or with two stout subulate teeth or slender upwardly 

 pubescent awns ^-i their length, connected by a fimbriate crown of 

 nearly fused squamellae. 



Encelia (Geraea) nudicauUs Gray, Proc. Am. Acad. viii. 656 (1873); 

 Jones, Proc. Calif. Acad. ser. 2. v. 701 (1895). 



HclianthcUa nudicauUs Gray, Proc. Am. Acad. xix. 9 (1883); 



Enccliopsis nudicauUs A. Nels. 1. c. (1909). 



EnceJiopsis tuta A. Nels. 1. c. (1909). 



Specimens examined : Idaho : rather rare, dry rocky bluffs, Salmon 

 River near Bay Horse, 5 Aug. 1895, Henderson 3653 (N) ; dr}'- sage 

 brush hills, above Salmon River, 6 Aug. 1895, Henderson 3653 (N); 

 Nevada: Candelaria, Esmeralda Co., 1881, Shockiey (G); Hawthorne, 

 Lepantha Mine, alt. 1677 m., 25 May 1897, Jones (N); compact clay 

 slopes, alt. 305 m., Las Vegas, 29 iVpril 1905, Jones 11857 (hb. Jones); 

 limestone clays. Las Vegas, 4 May 1905, Goodding 2271 (G, type 

 collection of E. tuta); clay. Horse Spring, alt. 915 m., 17 April 1894, 

 Jones 5069k (hb. Jones); Utah: St. Thomas or St. George, Capt. 

 F. M. Bishop (holotype in Gray Herb.) ; gravel at foot of precipitous 

 slopes in very poor clay soil, Marysvale, alt. 1830 m., 4 June 1894, 

 Jones 5376 (hb. Jones); Ferguson Spring, alt. 1920 m., 14 June 1900, 

 Jones 6403 (hb. Jones) ; halfway station W. of Wa Wa, alt. 2135 m., 

 15 May 1906, Jones 11856 (hb. Jones). — Inhabits rocky or hard clay 

 knolls where the soil is very compact (Jones, in litt.). 



I am unable to separate satisfactorily E. tuta from the older E. 

 nudicauUs. The type of the latter has medium-sized orbicular leaves, 

 connected by the Shockiey and Jones plants with the small subacute 

 ones of E. tuta, while the Henderson plants, largest- and broadest- 

 leaved of all, bear some smaller leaves identical in shape and tip with 

 those of E. tuta, indicating that the latter represents only a starved 

 phase of E. nudicauUs. The achenes appear to be rather variable in 

 pubescence when j'oung, and at maturity are strongly bidentate or 

 with two awns of varying length, the longest that I have seen being 

 about i the length of the mature fruit, although when young they are 

 often longer relative to the ovary. The squamellae, fairly distinct when 

 young, become fused into a barely fimbriate crown on the ripe fruit. 



■*•- -t— Heads larger, rays 2-4. | cm. long; pubescence silvery- velutinous; leaves 



rhombic-ovate, acute. 

 ++ Achenes puberulent or glabrate; rays 3.5-4.2 cm. long, 6-12 mm. wide. 



3. E. GRANDiFLORA (Joucs) A. Nels. "Stems very thick and 

 tufted, branched and very short, woody, densely covered with very 



