MR. GEYER’S ROCKY MOUNTAIN PLANTS. 297 
growing, and.his assertion that it blooms “after sunset" is 
derived from Pursh, who also never met with it in a living 
State, and whose conduct in regard to it is justly exposed 
by Mr. Nuttall, Z. c. Mr. Nuttall expressly says that the 
flowers expand towards sunset, and that they are “ yel- 
lowish-white :” Mr. Geyer indeed observes “ that they open 
during sunny hours, and are of a lurid golden yellow." 
These are the only discrepancies, if such they can be called ; 
and I think there cannot be a doubt that B. levicaulis 
must merge into B. ornata. 
2. B. nuda, Nutt.—Ph. Am. 1. p- 328, and 2. p. 274. Ment- 
zelia nuda, Torr. et Gr. Am. 1. p. 534. 
Has. Sterile, sunny and stony declivities of the high pius 
of the Upper Platte, near Fort Laramie. Corolla strami- 
neous. July. (n. 265.) 
3. B. pumila, Nutt.—Torr. et Gr. Am. 1. p. 535. 
Has. On decomposed bituminous slate rocks and calcareous 
clay-slates of the Upper Series of the chalk formation ; 
growing with Stanleya viridiflora. Corolla bright yellow. — 
July, August. (n. 95.).—A very distinct species, with, how- ee 
duel much the habit of the Chilian B. albescens, GE i — 
à ac à. p. 927. - : 
* B. albicaulis, Hook. Bor. Am. 1. p. 222. 
esis, Dougl-— Torr, e et Gr. Am. p. 5 
al i » Nutt." mst. 
B. Precipices of the high ec ae k 
the “Upper Colorado, rare. Flowers. bib yellow. (n 
