ARNICA COMPOSITAE 373 



tubular : achenes pubescent. Wooded hills in the CoaSt ranges, Washing- 

 ton to California. 



A. spathulata Greene Pitt, iii, 103. "A foot high or more, stoutish, 

 somewhat viscidly hirsute and tomentulose, very leafy below and flofif- 

 erous from about midway of the stem: lowest leaves 3 to 5 inches long, 

 broadly lanceolate-spatulate, doubly toothed, the two or more pairs of 

 lower cauline more narrowly spatulate but dilated just above the inser- 

 tion : peduncles 6 to 10, the lowest with a pair of ovate-acuminate sessile 

 bracts in the middle: heads campanulate, % inch high; involucre densely 

 woolly-hirsute and viscidulous ; fays none ; disk-corollas orchroleucous, 

 the tube hirsute, the teeth with a tuft of pilose hairs at tip : achenes 

 glabrous, minutely resinous-dotted; pappus white, barbellulate-scabrous. 

 Oregon. " 



** ** Rays conspicuous and elongated, rarely wanting: cauline 



leaves all opposite, in 1-3 pairs, broad and usually membranaceous, 



dentate or denticulate. 



A. cordifolia Hook. Fl. i, 331. Pubescent or the stems hirsute and 

 the peduncles villous: stems 1-2 feet high, or in alpine forms 4-8 inches 

 high : lower cauline and radical leiaves long-petioled, deeply cordate, or 

 sometimes ovate ; tipper cauline small, sessile : heads few, in smaller 

 plants solitary : involucre 8 lines high, pubescent or villous : rays usually 

 an inch long: achenes more or less hirsute. Woods and high mountains, 

 Brit. Columbia to California and the Rocky Mountains. 



Var. eradiata Gray Syn. Fl. i, pt. 2, 381. Heads smaller, without 

 rays : leaves oblong-ovate, at most subcordate. Eastern Oregon to Mont. 



A. latifolia Bong. Veg. Sitch. 147. Glabrous or minutely pubescent: 

 stems rather slender, 6-18 inches high : radical leaves cordate or. subcor- 

 date and petioled, cauline 2-3 pairs equal ovate, or oval, usually sharply 

 dentate, closely sessile by a broad base, or lowest with contracted base: 

 heads one to several, on slender peduncles in the axils of the upper leaves ; 

 bracts of the involucre oblanceolate with a broad base and long acumi- 

 nate apex ; achenes usually glabrate or glabrous. In mountainous districts 

 Alaska to Oregon and the Rocky Mountains of Colorado. 



A. cernua Howell. Glabrous or minutely pubescent; stems slender, 

 usually solitary, 4-12 inches high, bearing a single head on a curved pe- 

 duncle : leaves all more or less petioled, entire or coarsely dentate, ovate 

 and subcordate, or the upper lanceolgite with a broad cuneate base, usu- 

 ally not more than 15 lines long: involucre 8-10 lines long, of lanceolate 

 but not acuminate bracts : achenes short-pubescent. On the serpentine 

 formation of the Coast range, near Waldo, Oregon. 



* * No cordate leaves : radical leaves petioled tapering or some- 

 times abrupt at base: root-stock usually creeping and slender. 

 ■*" Leafy to the top : cauline leaves very seldom less than 4 pairs 



and the upper not conspicuously diminished : heads several or few, 



in small plants solitary. 



A. amplexicaulis Nutt. Trans. Am. Phil. Soc. vii, 480. Glabrous or 

 sometimes pubescent: 1-2 feet high: many-stemmed fiom matted root 

 stocks, rather stout, leaves from ovate to lanceolate-oblong, acute or acu- 

 minate, all the cauline sessile by half-clasping base, saliently and very 

 acutely dentate ; achenes hirsute-pubescent. Along small streams and on 

 waterfalls, never where it becomes dry. Oregon to Brit. Columbia. 



A. Chamissonis Less, in Linn. vi. 238. Few-stemmed fiom short 

 running rootstocks ; from tomentulose or villous pubescent to nearly glab- 

 rous, 1-2 feet high, rather slender : leaves oblong or oblong-lanceolate, 

 denticulate or dentate, lowest tapering into a marginal petiole, upper broad 

 at base and somewhat claspijig: achenes hirsiite-pubescent. In the high 



