a ae 
a ae =— a * 
a 
ARNIOA COMPOSIT4& 373 
A. spathulata Greene Pitt. iii. 103. ‘A foot high or more, stoutish, 
somewhat viscidly birsute and tomentulose, very leafy below and florif- 
erous from about midway of the stem: lowest leaves 3 to 5 inches long, 
broadly Janceolate-spatulate, doubly toothed, the two or more pairs of 
lower cauline more ean Ad 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, 34 inch high; involucre densely 
woolly-hirsute and viscidulous; rays none; disk-corollas orchroleucous, 
the tube hirsute, the teeth with a tuft of pilose hairs at tip: achenes 
labrous, minutely resinous-dotted ; pappus white, barbellulate-scabrous. 
regon.’ 
++ ++ 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, 531. 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 leaves long-petioled, deeply cordate, or 
sometimes onlv ovate; upper 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 accumi- 
nate apex; achenes usually glabrate or glabrous. In mountainous districts 
Alaska to Oregon-and the Rocky Mountains of Colorado 
A. cernuua Howell Glabrous or minutely pubescent; ttems 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 lanceolate 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 from 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 ttreams and on 
waterfalls never where it becomes dry. Oregon to Brit. Columbia. 
A. Chamissonis Less. in Linn. vi, 238. Few-stemmed from _— 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 clasping: achenes hirsute-pubescent. In the high 
mountains, Alaska to California, Utah, Colorado, Lake Stiperior and 
Washington. 
