568 
of the east and west forks of Big Goose Creek and on the high divide 
between these streams and Shell Creek. The topography of the region 
is shown in the Dayton Sheet of the Geographical Survey, published 
in 1895, 
The collection is composed of only 90 species, represented by 96 num- 
bers. The date of the collection is from July 15 to 24, 1893, inclusive. 
Mr. Tweedy has carefully given the approximate altitudes of the spe- 
cies, which have been appended in the catalogue. . 
During 1893 I collected quite extensively in northwestern Wyoming, 
especially in the Yellowstone Park and the timber-land reserve to the 
east. The flora of the Big Horn Mountains is very similar to that of 
the Yellowstone National Park. Nearly one-fourth of the species enu- 
merated below were observed by me. The similarity of the floras of 
the two regions is confirmed by Mr. Tweedy, who says, “The flora of 
this region does not differ materially from that of the adjacent main 
Rocky Mountain range to the west in Wyoming and northwest in Mon- 
tana.” Mr. Tweedy states also that the altitude of the timber line 
varies from 9,500 to 10,000 feet. 
A large part of the collection consists of alpine plants. The follow- 
ing comprises those species found at an altitude of 9,000 to 11,300 feet: 
Anemone narcissiflora. Mertensia alpina, 
Artemisia scopulorum. Myosotis sylvatica alpestris, 
Calandrinia grayi. Omphalodes howardi. 
Carex atrata. Orthocarpus pilosus. 
Carex capitata. Pedicularis parryi. 
Carex nova. Primula parryi. 
Carex scirpoidea. Ptilepida grandiflora. 
Dryas octopetala. Ranunculus eschscholtzii. 
Erigeron lanatus. Salix chlorophylla. 
Geum rossii. Salix glauca villosa. 
Kalmia glauca microphylla. Silene acaulis. 
The Carices have been named by L. H. Bailey; the willows by the 
late M.S. Bebb, who has described the single new variety contained in 
the collection, 
CATALOGUE OF SPECIES. 
Clematis alpina occidentalis (Hornem.) Gray in Newton & Jenney, Geol. Surv. 
Black Hills, 531 (1880); Atragene occidentalis Hornem. Hort. Hafn. 520 (1813). 
Rocky woods, altitude 2,460 meters (8,000 feet), July 21 (No. 78), 
Thalictrum fendleri Engelm. Mem. Amer. Acad. n. ser. iv, 5 (1849), 
Altitude 2,150 meters (7,000 feet), July 15 (No. 15). 
Anemone narcissiflora I.. Sp. Pl. i, 542 (1753), 
Common; altitude 2,825 to 3,390 meters (9,500 to 11,000 feet), July 20 (No. 51). 
Pulsatilla hirsutissima (Pursh) Britton, Ann. N. Y. Acad. vi, 217 (1891); Clematis 
hirsutissima Pursh, F]. ii, 385 (1814); Anemone patens nuttalliana Gray, Man. ed. 5, 36 
(1867); Pulsatilla nuttalliana Spreng. Syst. ii, 663 (1825), 
Altitude 2,460 meters (8,000 feet), July 20 (No. 52), 
Trollius laxus Salish. Trans. Linn. Soc. viii, 803 (1807). 
Bogs and cold woods, altitude 2,160 meters (8,000 feet), July 21 (No. 85), 
