686 CONTEIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



20. Aster wootonii Greene, Leaflets 1: 146. 1905. 



Aster hesperius wootonii Greene, Bull. Torrey Club 25: 119. 1898. 



Type locality: Eagle Creek, White Mountains, New Mexico. Type collected by 

 Wooton (no. 329). 



Range: Mountains of New Mexico and Arizona. 



New Mexico: Tunitcha Mountains; Farmington; Dulce; Santa Fe; Pecos; Catskill; 

 Taos; Ensenada; Chama; Grand Canyon of the Gila; Kingston; White Mountains. 

 Wet ground, especially along streams, in the Transition Zone. 



21. Aster hesperius A. Gray, Syn. Fl. l^: 192. 1884. 



Type locality: "Damp soil and along streams, S. Colorado and New Mexico to 

 Arizona and S. California." 



Range: Colorado and western Texas to southern California. 



New Mexico: Albuquerque; Mesilla Valley; Round Mountain. Wet ground, in 

 the Lower and Upper Sonoran zones. 



36. BUCEPHALUS Nutt. 



Glabrous, usually glaucous, perennial herbs with alternate sessile entire leaves and 

 numerous showy heads in terminal corymbs; bracts broad, imbricated, the outer 

 successively shorter, ciliate, dry and chartaceous, with prominent midribs, usually 

 purplish; rays purple or blue; achenes strigose. 



key to the species. 



Inner bracts acute; leaves not narrowed at the base 1. E. glaucus. 



All bracts obtuse or short-mucronate; leaves conspicuously narrowed 



at the base 2. E. formosus. 



1. Bucephalus glaucus Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 299. 1841. 

 Aster glaucus Torr. & Gray, Fl. N. Amer. 2: 159. 1842. 



Type locality: "Towards the sources of the Platte and in the Rocky Mountains." 

 Range: Wyoming to Utah and northern New Mexico. 



New Mexico: Dulce {Standley 8224). Open slopes in the mountains, in the Transi- 

 tion Zone. 



2. Bucephalus formosus Greene, Pittonia 4: 156. 1900. 



Aster glaucus formosus A. Nels. in Coulter, New Man. Rocky Mount. 513. 1909. 

 Type locality: Mountains near Pagosa Peak, southern Colorado. 

 Range: Mountains of southern Colorado and northern New Mexico. 

 New ]\Iexico: Chama {Standley 6832). Transition Zone. 



37. HERIIICKIA Woot. & Standi. 



Perennial herb with alternate thick rigid toothed sessile leaves; heads solitary at 

 the ends of the slender leafy branches; rays purple; disk flowers yellow, drying pur- 

 plish; bracts of the involucre in several series, about equal, conspicuously keeled, 

 with green foliaceous tips and spinescent points, the outer bracts foliaceous and 

 changing gradually into the proper leaves; achenes compressed, striate, glabrous; 

 pappus simple, of numerous stout, simple, nearly equal, strongly barbellate bristles. 



1. Herrickia horrida Woot. & Standi. Contr. U. S. Nat. Herb. 16: 186. 1913. 

 Type locality: Baldy, New Mexico. Type collected by Wooton, August 14, 1910. 

 Range: Mountains of northern New Mexico, probably in adjacent Colorado. 

 New Mexico: Baldy; Raton; Spring Canyon. 



38. LBUCOSYRIS Greene. Spiny aster. 



Nearly leafless perennial, often woody at the base, with slender striate green 

 branches; cauline leaves small, fugacious, with stout spines in or above the axils; 

 involucre hemispheric, small, of thin lanceolate bracts imbricated in about 3 series; 

 rays white; achenes glabrous. 



