551 



i OMI'USI 1AI-. 



Vol. III. 



3. Arnica mollis Hook. 1 lair)- Arnica. 

 Fig. 4601. 



Arnica mollis Hook. FI. Hor. Am. 1:33'- 1833- 



\ illous-pubescent ; stem simple, or little 

 branched, I-2$ high, bearing 1-6 heads at 

 the summit. Leaves oblong or oblong-lanceo- 

 late, dentate or entire, acute or obtuse, 2-5' 

 long, 3"-9" wide, the lower and basal ones 

 narrowed into petioles, the upper sessile, and 

 usually somewhat connate by a broad or nar- 

 row ed base, those of the stem 3-5 pairs, usu- 

 ally with some alternate small ones on the 

 branches; heads l'-2' broad; bracts of the in- 

 volucre acute; rays 10-15, 3-toothed; achenes 

 hirsute-pubescent; pappus yellow-brown, plu- 

 mose. 



Mountains of northern New York, New Hamp- 

 shire and Maine to New Brunswick, west to Lake 

 Superior, British Columbia and California, south 

 in the Rocky Mountains to Utah and Colorado. 

 Included, in our first edition, in the northwestern 

 A. Chamissonis Less. June-Aug. 



4. Arnica chionopappa Fernald. White-plumed 

 Arnica. Fig. 4602. 



Arnica chionopappa Fernald, Rhodora 7 : 148. 1905. 



Stem 15' high or less, villous to the base. Leaves thin in 

 texture, the lower and basal ones ovate to lanceolate, acute, 

 narrowed at the base, sharply dentate with few teeth, peti- 

 oled, 2i'-4F long, the upper few pairs narrowly lanceolate, 

 entire, sessile; heads solitary or few, about i broad; invo- 

 lucre villous, 4"-S" high, its bracts linear-lanceolate, acumi- 

 nate ; rays 10-15; pappus bright white, barbellate. 



On wet cliffs, Quebec and New Brunswick. June-July. 



Arnica gaspensis Fernald. from ledges in Gaspe County, Que- 

 bec, has creamy-white pappus, the involucre and peduncles 

 glandular-pubescent. 



5. Arnica alpina ( L. ) Olin & Laden. 



Mountain Tobacco. Arctic Leopard's- 



bane. Arctic Arnica. Fig. 4603. 



Arnica montana var. alpina L. Sp. PI. 884. 1753. 

 Arnica alpina Olin & Laden, Diss. 11. 1799- 

 A. angustifolia Vahl, Fl. Dan. pi. 15-4- 1814. 

 A. plantaginea Pursh, Fl. Am. Sept. 527. 1814. 

 A. Sornborgeri Fernald, Rhodora 7 : 147. 1905. 



Stem slender, 6'-is' high, villous or pubes- 

 cent, and glandular or glabrous below ; stem 

 simple, usually bearing but a single head, but 

 sometimes with 1-3 additional ones from the 

 axils of the upper leaves. Leaves lanceolate, 

 linear-oblong, or the lowest spatulate, thickish, 

 entire or denticulate, 3-nerved, the basal ones 

 petioled, those of the stem 1-4 pairs, sessile 

 or short-petioled, scarcely connate, the upper 

 pair usually much smaller than the lower ones; 

 heads about 2' broad; rays 10^15, 3-toothed; 

 achenes hirsute; pappus brownish. 



Labrador to Greenland and the Arctic Sea, 

 Also in northern Europe. Races differ in pubes- 

 cence. Rocky Mountain plants formerly referred 

 to this species appear to be distinct. May-Sept. 



