186 
BOTANY. 
outer scales very obtuse, the innermost narrower and ratlier acute. — Arctic 
America, and from Newfoundland and Labrador to California ; mountainous 
parts of Europe and Northern Asia. In Nevada and Utah, from the Haval- 
lah Mountains to the Uintas; 6,000-10,000 feet elevation. (651;) and Var. 
ROSEA, (652.) 
Antennaria dimorpha, T. & Gr. Dwarf, csespitose ; stems ^-2' high 
from a somewhat woody entangled caudex ; leaves 2—12" long, silvery- 
tomentose ; the radical spatulate, their bases inclosing large ovoid-fusiform 
white-woolly leaf-buds; stem-leaves linear, the uppermost exceeding the 
solitary top-shaped heads ; sterile heads with ovate-lanceolate scarious brown- 
ish involucral scales, the outer ones shorter and woolly at the base, pappus 
strongly barbellate toward the ends ; fertile heads larger, the inner involu- 
cral scales lanceolate-acuminate, equaling the very slender and nearly 
smooth seta3 of the pappus. — Two forms occur : — 
Var. NuTTALLii. Stems 4-G" high ; leaves proportionately small ; fer- 
tile heads 3-4" long ; styles slightly exserted. (653.) 
Var. MACROCEPHALA. Stems 8-15" high ; leaves often 1' long, very 
silky, and the pod-like buds very large ; fertile heads 7—9" long ; styles 
sometimes exserted, but often only half as long as the corolla. (654.) 
Both forms occur on the foot-hills from the Sierras to the AVahsatch, at 
4,500-6,000 feet elevation ; May, June. The smaller form was collected 
near Virginia City by Bloomer, and in the Black Hills of the Platte by 
Nuttall. 
Arnica longiifolia. Many-stemmed from a scaly caudex, minutely 
scabrous-pubcrulent ; leaves in 5-6 pairs, elongated, lanceolate, acuminate, 
denticulate, the upper pairs sessile and slightly connate-amplexicaul, the 
lower with sheathing connate petioles ; heads 1-8, commonly 5, not 
large ; involucral scales lanceolate, acute ; achenia minutely glandular, but 
not hispid. — Stems 14-24' high; leaves 5-6' long, 7-10" broad, the very 
lowest reduced to ocreate scales. In dense clumps among rocks, Clover 
i\[()uiilains, Nevada, and in the Uintas above Bear Eiver Canon; 10,000 feet 
altitude; August, September. (655.) 
Arnica ANGusTiFOLiA, Vahl. Hirsute or hairy; leaves lanceolate, 3-5- 
ribbed, entire or remotely denticulate, radical ones and the lowest pair taper- 
ing into short petioles ; cauline in 1-3 pairs, sessile ; heads 1-3 ; involucre 
villous-hirsute, [woolly, T. 4 G.il achenia hirsute. — Arctic America and 
