COMPOSITAE. 385 



Arnica gracilis Rydb. Herbage minutely atomiferous glandular; stems 

 slender, 15-30 cm. high; basal leaves ovate, dentate, 3-ribbed, slender-petioled; 

 cauline leaves in 2 pairs, similar, the upper sessile; heads 1-3; ray-corollas 

 bright yellow, 15 mm. long; akenes minutely glandular. 



Olympic Mountains, Lamb, Piper. 



Arnica latifolia Bong. Glabrous or nearly so; stems erect, 30-60 cm. high, 

 from slender rootstocks; leaves all opposite, the lower petioled, cordate or 

 subcordate, coarsely dentate; cauline leaves 2 or 3 pairs, oval to ovate, sessile 

 by a broad base; heads long-ped uncled; involucre campanulate, sparsely 

 pilose to nearly glabrous; tegules about 13, oblong-obovate, acuminate, 1 cm. 

 long; ray-flowers dark yellow, 1.5-2 cm. long; akenes glabrous. 



Common along alpine streams. 



Arnica betonicaefolia Greene. Nearly glabrous; stems slender, 6-15 cm. 

 high; leaves oval to oval-lanceolate, obtuse, crenate-dentate, 2-3 cm. long, the 

 basal ones petioled, the 2-3 pairs of cauline sessile; heads 1-3, long-peduncled; 

 involucre 10 mm. high, turbinate; tegules pubescent, acute; ray-flowers 

 1-1.5 cm. long; akenes sparsely hairy at top; pappus white. 



In alpine meadows at about 2000 m. altitude. The type specimens are 

 from Mount Steele in the Olympic Mountains. 



Arnica eradiata (Gray) Heller. (^4. parryi Gray.) Hirsutely pubescent, 

 glandular toward the top; stems mostly simple, 30-50 cm. high; leaves oval to 

 ovate-oblong, denticulate, the basal ones petioled; cauline 1-3 pairs; heads 

 rayless, solitary or often 3-5; involucre 10—12 mm. high; tegules hirsute and 

 glandular; akenes glabrous or sparsely hirsute. 



In alpine meadows at about 2000 m. altitude. 



Arnica fulgens Pursh. Erect, 30-60 cm. high, the crown thickened and 

 rusty-woolly, sometimes with creeping rootstocks; whole plant viscid-pubes- 

 cent; basal leaves spatulate-lanceolate, 3-nerved, entire or nearly so, obtuse, 

 5-12 cm. long; cauline 2 or 3 pairs, sessile, the upper sometimes very small; 

 heads 1-3, long-peduncled; involucres 10-12 mm. high, densely glandular- 

 pubescent; ray-flowers yellow, 12-16 mm. long; tubes of disk-corollas hairy; 

 akenes pubescent. 



A species of the interior, rare in our limits; Goat Mountains, Allen. The 

 subterranean characters may vary according to soil; the form without root- 

 stocks has been named as a species, A. pedunculate. Rydb. 



Arnica aurantiaca G reene - Tufted, 5-20 cm. high; stems erect, bearing 

 1-3 heads; cauline leaves 2 or 3 pairs, entire, the lowest oblong, obtuse, the 

 upper oblong-lanceolate, acute, glabrous except the margins; peduncle sparsely 

 glandular and pubescent; involucre turbinate-campanulate; tegules about 10, 

 lanceolate, woolly at base, thinly ciliate; ray-flowers orange-yellow; akenes 

 silky; pappus white. 



Goat Mountains, Allen. 



Arnica amplexicaulis Nutt. Nearly glabrous and somewhat gummy; 

 stems 30-60 cm. high, tufted; leaves ovate, acute, saliently dentate, glabrous 

 and gummy above, 4-7 cm. long; basal ones petioled; cauline 4-7 pairs, half- 

 clasping at base; heads mostly 3 or 5; ray-flowers 1-1.5 cm. long; akenes hairy. 



Along streams, especially in the mountains at low altitudes. First col- 

 lected at ^"illamette Falls, Oregon, by Nuttall. 



Arnica macounii Greene. Sparsely pubescent; stems tufted, 30-50 cm. 

 high; leaves lanceolate or oblong-lanceolate, acute, serrate-dentate, 5-10 cm. 

 long, the basal ones petioled, the 4-7 cauline pairs sessile; heads cymose, usually 

 5-7, on small stems 1-3; involucre campanulate; tegules hispidulous, not 

 glandular; akenes hispid and glandular; pappus fuscous. 

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