BLAKE.— EXCELIA AXD RELATED GENERA. 375 



THOiDES HBK. The ra^,'-flowers are described as neutral by Brande- 

 gee, but in the specimens of the type collection examined are styliferous 

 but undoubtedly sterile. 



Encelia nivca Benth. Bot. ^'oy. Sulph. 27 (1844) has been variously 

 identified, but from the opposite leaves and the thickened achenes 

 cannot have been an Encelia, and was probably a Viguiera. 



Encelia ohlonga Rob. & Fern. Proc. Am. Acad. xxx. 118 (1894), from 

 Durango and Chihuahua, is a synon^-m of Ilelianthella Pringlei Gray, 

 Proc. Am. Acad. xxi. 389 (1886). The species, an alternate-leaved 

 frutescent plant with large heads solitar^y and long-peduncled at tips 

 of stems, and involucre of ovate-based long-attenuate somewhat 

 foliaceous bracts much exceeding the slightly resinous disk, is some- 

 what anomalous in appearance, but seems best referred to Floiirensia 

 as F. Pringlei (Gra^O Blake, n. comb. The achenes are oblong, 

 11 mm. long, much thickened, striate, densely pubescent, and tend 

 at maturity to lose the 2 awns which compose the pappus. 



Encelia pilosa Greenm. 1. c. xxxix. Ill (1903) is a synonym of 



SlMSL\ LAGASCAEFORMIS DC. 



Encelia jdeistocephala J. D. Sni. Bot. Gaz. xiii. 189 (1888) = Ver- 

 BESiNA PLEISTOCEPHALA (J. D. Sm.) Rob. Proc. Am. Acad, xliii. 41 

 (1907). 



Encelia jjoli/cephala Hemsl. 1. c. 184 (1881) is a synonym of Simsia 

 POLYCEPHALA Benth. 



Encelia Pringlei Fern. Proc. Am. Acad. xxxv. 573 (1900), from 

 Hidalgo, has the pappus and achene of Viguiera and should be referred 

 to that genus as Viguiera trachyphylla Blake, n. nom. (not V. 

 Pringlei Rob. & Greenm. Proc. Am. Acad. xxix. 387 (1894). 



Encelia purpurea Rose, Contr. U. S. Nat. Herb. i. 336 (1895) = 

 Simsia lagascaeformis DC. 



Encelia resinosa Brandeg. Zoe v. 240 (1906), from Hidalgo, an 

 alternate-leaved resinous shrub with a few racemose axillary large 

 heads, seems best referred to Flourensia as F. resinosa (Brandeg.) 

 Blake, n. comb. The young achene is flattish, scantily haired on the 

 sides and thickly at the apex, with two long awns disposed to be 

 trifid from near the base. 



Encelia rhombifolia Rob. & Greenm. Am. Journ. Sci. ser. 3. 1. 155 

 (1895), from Oaxaca = Viguiera rhombifolia (Rob. & Greenm.) 

 Blake, n. comb. Pappus of two awns with intermediate short squamel- 

 lae; achene thickened and pubescent. 



Encelia sanguinea Hemsl. 1. c. 185 (1881) = Simsia sanguinea Gray. 



Encelia sericea Hemsl. 1. c. 185 (1881) is a Simsia. 



Encelia Sodiroi Hieron. Bot. Jahrb. xxix. 43 (1900) is a Simsia. 



