266 PROCEEDINGS OF THE AMERICAN ACADEMY 



76. E. BREVICAULE, Nutt. More lax and slender, glabrous or 

 glabrate above the white-tomentose base : leaves linear to narrowly 

 oblanceolate, 1 to 3 inches long, attenuate to a very short petiole, 

 often revolute, sometimes glabrate above: involucres 1| lines long, 

 nearly glabrous : flowers yellow, a line long. — Idaho and Wyoming 

 to New Mexico. 



77. E. LONCHOPHYLLUM, Torr. & Gray. Described as taller than 

 the last (a foot high or more), with a loose panicle-like cyme ; leaves 

 lanceolate to broadly linear, 3 inches long and attenuate into a petiole 

 an inch long or more : flowers white, few in the involucres. — New 

 Mexico, only by Dr. Newberry. 



1-t- •»-+ ++ Annuals : leaves mostly rosulate at the base, a whorl rarely subtend- 

 ing the umbel : peduncle short. 



78. E. TRUNCATUM, Torr. & Gray. Slender, a foot high or less, 

 floccose-woolly throughout : leaves oblanceolate, an inch long : umbel 

 leafly-bracted, of 4 to 6 elongated once or twice divided rays : involu- 

 cres tomentose, oblong-turbinate, 2 lines long : flowers rose-colored, a 

 line long. — Near Mount Diablo, California ; W. H. Brewer. 



79. E. MoHAVENSE. Very slender, glabrous except at the base: 

 leaves round or ovate, tomentose, small : umbel naked, of 3 or more 

 repeatedly divided rays : involucres glabrous, broadly turbinate, a line 

 long : flowers yellow, very small (scarcely a half line long), abruptly 

 narrowed at base. — Mohave Valley ; Dr. Edward Palmer, 1876. 



80. E. Lemmoni. Rather stout, a span high, more or less hirsute 

 with very short spreading hairs, not at all tomentose : leaves orbicu- 

 lar-reniform, 6 to 9 lines broad, on slender petioles : peduncle fistulous 

 or inflated, bearing a naked 3-rayed narrow umbel, twice or thrice 

 divided: involucres glandular-pubescent, rather broadly turbinate, 1^ 

 lines long : flowers pale rose-color, half a line long, with narrow sejmls. 

 — On sand hills near Reno, Nevada; J. G. Lemmon, 1876. A very 

 peculiar species. 



-1- -4- -I- ^- Involucres sessile and solitary (often secund) along the ascending and 

 usually long-virgate branches of the open naked dichotomous panicle : lowest 

 bracts rarely foliaceous : flowers glabrous (except in n. 89). — (§ Vikgata, 

 Benth., Torr. & Gray, excl. sp.) 



++ White-tomentose perennials, leafy below : panicle sparingly branched, usu- 

 ally virgate : involucres tomentose, the teeth not margined: flowers white 

 or rose-colored. 



81. E. Wrightii, Torr. Much branched and usually very leafy 

 at base, rather slender : leaves oblong- to linear-oblanceoiate, acute, an 

 inch long or less : bracts all small, triangular : involucres and flowers 



