MR. GEYER'S ROCKY MOUNTAIN PLANTS. 213 
Has. 9, Stony plains, on the north and south Forks of the 
Platte. Corolla always white. Geyer. n. 166.—I do not 
see how this can be distinguished from P. cespitosa. It 
has much smaller leaves, and shorter petioles. P. argo- 
phylla, on the other hand, judging by original specimens 
from Mr. Nuttall, has broader leaflets than P. cespitosa, 
and is I fear a mere variety. 
2. P. sericea, Nutt.—Torr. et Gr. Am. 1. p. 343. 
Has. Calcareous cliffs and rocky ridges, Upper Platte River, 
eme with * Evolvulus argenteus. Corolla reddish. June. 
n. 161.) 
3. P. longifolia, Nutt.—Torr. et Gr. Am. 1. p. 346.—Pso- 
ralea longifolia-, Ph. DC. Orobus longif. Nutt. Gen. Am. 
2.p.95. O.? longifol. DC. Torr. in Ann. Lyc. N. York, 2. 
p. 180. 
Has. Rare. On drift-sand of the plains of Upper Platte, 
growing in groups and binding the sand-hills with its 
long filiform roots. Corolla lurid. Legume much inflated, 
| whitish-green, dotted with pale purple. (n. 22). A most 
curious and beautiful species : found also by Mr. Gordon, 
(in the Lower Platte Sweet Water River) who observes 
that the large pods are spotted like a bird's egg. mr us 
4 P. annua (Gey. mst.); annua simplex erecta v. ramosa — 
prostrata canescenti-hirsuta, ramis flexuosis, foliis. inn E 
i linearibus obtusis; teacinis ai n E 
"feris folio: brevioribus fructiferis sublo longioribus, floribus —— 
. Parvis ochroleucis, calycibus sericeis corolle dimidiam  . 
 Squantibus, leguminibus ovatis membranaceis inflatis —— 
re (& unc, longis) sursum curvatis acuminatis. € 
sat On firm clayey banks, among “ Artemisia cand" im - 
: the drift-sand plains of the Upper Platte River. -Grows 
ah i flowers yellowish-white. June. (n. 1.)—: 
Annual species, apparently very distinct, esp i ly by. 
(contr) small size of its inflated membranac 
" Was gathered by Mr. Gonlonóu the. Ji lat 
RD, but the station is not 
