CATALOGUE. 229 



subsessile, white-tomentose beneath ; cyme dichotomous, leafy ; involucres 

 in the forks or sessile on the branches, niany-flowered, loosely silky-villous 

 externally ; segments obovate or spatulate ; perigonia somewhat petal-like, 

 white or whitish, the 3 interior segments often becoming longer. — Upper 

 Arkansas River, Colorado, 1873, Wolf (25); Camp Bowie, Arizona, August, 

 1874, Rothrock (473). 



Eeiogonum flavum, Nutt.— Perennial, canescent with a silky-woolly 

 or hoary pubescence ; stems- scapiform, 3 to 6 inches high, from a thick, 

 many -parted caudex ; leaves spatulate or oblong-spatulate, becoming more 

 or less glabrate above, radical ones crowded on the caudex, those of the 

 involucre about equalling the 2 to 8 rays and of the same number ; peri- 

 gonia golden-yellow, 3 lines long, silky-villous on the outside, funnel-form 

 at base, somewhat produced into a stipe ; ovary hirsute at the apex.— South 

 Park, Colorado, 1873, Wolf (26). — Var. elatius, Watson, Twin Lakes, 

 Colorado, August, 1873, Wolf (28); Arizona, 1873, Loew (153 a). 



Eeiogonum c^espitosum, Nutt. (Watson, Bot. King, p. 298). — Utah, 

 and Halleck Station, Nevada, 1871, 1872, Watson's Report. 



Eriogonum stellatum, Benth. (JB. polyantlium, Benth. ; Watson, I. c. 

 p. 478).— Utah, 1871, 1872, Watson's Report. 



Eeiogonum heeacleoides, Nutt. (Watson, I. c. p. 299). — Utah, 1871, 

 1872, Watson's Report. 



Eeiogonum umbellatum, Torr. (Watson, I. c. p. 300). — Utah and Ne- 

 vada, 1871, 1872, Watson's Report; South Park, Colorado, 1873, Wolf (24). 



Eeiogonum ovalipolium, Nutt. (Watson, I. c. p. 301). — Northern Ne- 

 vada, 1871, 1872, Watson's Report. 



Eeiogonum pauciflobum, Pursh. — Low, caespitose ; branches of the 

 caudex very short and crowded ; leaves linear or subspatulate, revolute- 

 margined, attenuated into a petiole, at length nearly smooth ; scape 4 to 6 

 inches high, bearing a single head ; involucres 5 to 10, turbinate-campanu- 

 late, 5-toothed ; calyx white, glabrous, lobes oval ; filaments pubescent 

 below. — Torr. & Gray, Rev. Eriog. Proc. Am. Acad. 8, p. 166. — Sulphur 

 Springs, South Park, Colorado, August, 1873, Rothrock (27). 



Eeiogonum elatum, Dougl. (Watson, I. c. p. 302). — Nevada, 1871, 

 1872, Watson's Report (260). 



