250 MR. GEYER’S ROCKY MOUNTAIN PLANTS. 
of the central ridge A. tridentata prevails, cana having 
disappeared about the sources of the Columbia.—A shrub, 
1-12 feet in height, with stems 5-6 inches in diameter. 
Sept. (n. 654.) 
4. À. pedatifida, Nutt.—Torr. et Gr. Am. 2. p. 419. 
Has. On the highest rocky table-lands, near the sources of 
Missouri River, covering small tracts. Flowers bright 
orange. June. (n. 14.) —Mr. Gordon finds the same species 
in the Upper Platte. 
5. A. Ludoviciana, Nutt.—Torr. et Gr. Am. 2. p. 420. —A. 
Purshiana, $. Bess. in Hook. Fl. Bor. Am. 1. p. 322. 
Han. Thickets in sunny, sandy or sterile places ; common over 
the whole territories of Missouri, Dacotah and Oregon; from 
St. Louis to the sources of the Mississipi and across to the 
Upper Columbia. Collected at Flathead River (Upper 
Clarke's). Sept. (n. 177.) 
6. À. vulgaris, L.—Hook. Fl. Bor. Am. 2. p. 421. Torr. et | 
- Gr. Am. 2. p. 421. 
Has. This is sent separately from, but bears the same 
number as the preceding, A. Ludoviciana, indicating as 
it is from the same locality. 
7. À. biennis, Willd.—Hook. Fl. Bor. Am. 1. p. 325. Torr i 
et Gr. Am. 2. p. 423. l 
Has. Saline loamy exsiccated places i in the defiles of the 
calcareous hills of Black’s Fork of Upper. Colorado. Aug. 
{n 103.) 
3 À. . 
frigida, -Willd.— Hook. Fl. Do he. 1. P 321. T 
Am. 2. p. 424. ——— Seog 
AB. H stony and table-lands, from the Upper T 
e Lac Anthony's Falls) to Flathead River, moal. with 3 
.. lardiapi la. Sept. (n. 112) — i 
= 1. Gnaphalium pp Tres Hooke.. m. Bor. Am 
*h P 328. Torr. x 
