MR. GEYER'S ROCKY MOUNTAIN PLANTS. 217 
Root creeping, very long and tenacious. Racemes of 
flowers always central and sessile. Flowers white. July 
(n. 258.) | 
RosAcEez, Juss. 
1. Prunus Americana, Marsh.— "Torr. et Gr. Am. 1. p. 407. 
P. nigra, Ait.—Ph.—Bot. Mag. t. 1117. Cerasus nigra, 
Hook. Fl. Bor. Am. 1. p. 167. 
Ha». Fertile sheltered valleys, under Pines: only seen in 
the Cœur d'Aleine country. Without flowers or fruit. 
April. (n. 496.) 
l. Cerasus mollis, Dougl.—Hook. Fl. Bor. Am. 3 1. p. 169. 
Torr. et Gr. Am. 1. p. 410. 
Has. Slopes of the fertile grassy mountains in the Giur 
d'Aleine country, between Upper Spokan and Peu d'Oreilles 
Rivers. Small tree, scarcely 10 feet high. April. (n. 288.) 
L. Spiræa opulifolia, L.—Hook. Fl. Bor: Am. 1. p. 47 i, 
Torr. et Gr. Am. 1. p. 413. 
Has, Rocky shady places, valley of Kooskooskee River. 
Eight feet high ; with arcuate branches. June. (n. 558) ——— 
?. S. betulefolia, Pall. Fl. Ross. t. 16. Hook. Fl. Bor. Am. — 
l.p.172.—S.chammdrifolia, PÀ. — — — de. 
Han, Stony alpine declivities, Sorka M'oubtsins ^ +7. 2 
| ‘never more than 2-3} feet high. June. (n. 657 3 
3. S. ariæfolia, Sm. in Rees, Cyel.—Li indi 
_ Hook. Fl. Bor. Am.1.p.178. EP 
Tits -— slopes of the mountains, rego 
| Nutt.—8. discolor, Ph. (jide Torr: et Gr)— 
ET ariæfolia, B. discolor, Torr. et Gr. Am. 1. 1 416. 
