SUNFLOWER FAMILY 421 
and from the Oregon Coast Ranges south of Clatsop County. Type locality: ‘“‘Alpine rivulets of the Rocky 
Mountains Teaser, ”* June—Sept. 
5. Arnica diversifélia Greene. Lawless Arnica. Fig. 5723. 
Arnica latifolia var. viscidula A. Gray, Syn. Fl. N. Amer. 1°: 381. 1884. 
Arnica diversifolia Greene, Pittonia 4: 171. 
Perennial from freely rooting rhizomes; stems solitary on in loose tufts, 1.5-4 dm. tall, 
disaular -onberulent to subglabrous. Cauline leaves mostly 3-4 pairs, sessile or at least ong lower 
generally shortly Ne cing ie ovate or lies to elliptic or ila t: lat irregularly toothed, the 
i commo e largest, wit s cm. long an se developed, 
Nappa basal leaves seh produced ; be ads generally graeereg narrow w, more or less turbi- 
the disk-flowers much fewer than in characteristic 4. mollis ; involucre 10-14 ai high, its 
bracts wien “A acuminate, shortly stipitate-glandular inroughont-4 sometimes sparsely long- 
pest oo rays commonly about 8 or about 13, 1.5-2 cm. long; athe stramineous to tawny, 
um 
i jen at moderate to high elevations in the mountains, Canadian and Hudso onian Zones; Alaska to 
Mon tans “Utah, and the northern meres Nevada in California; not common, type locality. Eagle Creek (Wal- 
lowa] Nisan tains, Cream . July—Sep 
venient nam a complex series of ga hybrids and hybrid progeny, 
invobeing ai vei or a. pst Ho on ‘the one chan d, and A. cor Anabey lia or A. latifolia on the other. The 
pollen is irregular and often very scanty, and apomixis has been report 
5721. Arnica amplexicaulis 
5722. Arnica mollis 
