COMPOSITAE (COMPOSITE family) 573 



tapering upward, pilberulent. [A. parvifoUa Greene, PI. Bafei". 3:''28°. 1901; 

 A. coloradensis Rydb. 1. c. 32: 131 (?).]-^-|-In the mc>uiita;iliS of our range. 



6. 'Arnica subplumosa Greene, Pitt, 3: 104. 1896. Stems erect, 4-8 dm. 

 high,' the internoded long, of twi 10-15 cm., ■exceeding the leaves Or rarely- 

 shorter; pubescence of two kinds, a' short, dense, glandular puberiilence and 

 some scattering white crisped hairs: leaves 3-5 pairs, denticulate; "the toWest 

 obiong-oblanceolate,' Q^IO cm. long, on slender petioles often' as long; the 

 upper pairs sessile' by a'tjroad' base, ovate to Oblong, 3-lp''cln.' long: heads 

 1-3, mostly 'siiigle and Iblig-peduncled, large; disk '15-20 liim. high, 20-30 

 mm. birba,d; rkys 10-15, 20-30 m.th. long^ 6^8 mm. bi'ba.d; inVoIucral bracts 

 14-20^ lanceolate, acute, Shorter than the di^k: achenes striate, hearly hnear, 

 obscurely short-hispid, about 'S mm. long, eqjialing the Sordid, subplumose 

 pSpiJiis.' A. chamissonis, largely, as to our range.' ''(A. chamissonis longino- 

 ddsaA. I^els^B'ot. Gaz._30: 199. 1900; A. i-iTOJam Greene, 1. q. 4: 163. 1900.) 

 ^Boggy stream banks in the mountains of GUI' range and northwestward. 



6a. Armcn subplumosa sylvatica (Greene), A. NelS. Smaller throughout, 

 clamniy' ^^andular-pubescent, the ihternodes fehorter than the leaves. (A. 

 sylvatica Greene, PI. Baker. 3: 27. '1901.) — Wet places' in 'piiiie' and spruce 



woods. ■! ■■■ 'I'iC ' .■ •, ■■ ■' •:r.l 



66. Arnica subplumosa ^acillenta (Greehp) A. Nfel'sJ As tall as the species 

 but less stout, thinner leaved, and less glandiilar, thfepappils scarcely less 

 plumose. (A. macillehtct Gre6ri6, Pitt. 4: 161. l'900.)-^tream banks at 

 lower station's. • '' ' / 



7. Arnica mollis Hook;'l. C. BoftTy villous, ptiberulent, or nearly glabrbiis, 

 2-4 dm. high: lower leaves broadly ovate or oblahceolsite, obtuse, m,ostlJr 

 5-nerved, abruptly tapering into a short, niargined petiole, morei or lesS delfi- 

 tate: heads rather' larger; the involucral bracts broadly oblOn^'or nari-ower, 

 acute or obtuse, somewhat villotis:'ray'^' light yellow: achenes li'ghtly pubes- 

 cent or glabrate. 4,. fihamisspnis in part, but mostly A. latifolia as tO oiir 

 range. {A. latifolia Gray, Hot. Cal. 1: 415. 1885; A. to'meniiilosa''Rydb. i. c. 

 28: 20. 1901.)— Northern Wyoming and Mo^taia'to the Pacific States. '' 



8. Arnica rhizomata A." Nels. 1. ci.31:'409., June,' 1901. Conspicuou'sly 

 rl^izomatous, the cireeping rootstOcks 'sheathing-bracteate 'aV the nodes, giv- 

 ing rise at iritervals to the erect leafy stems and a few fleshy roots; pubescence 

 whitish, soft, almost arachnoid, minutely ^i'anular-glutihous underneath the 

 pubescence on the'inflofescenc^; sttos ^-5 dm. high: teaveS 5-7 pairs) rather 

 uniformly distributed, oblong-lanceblate, obtuse to acute; the' lowest pair 

 with short scarious-margiried petioles, early deciduOus; the next 1 or 2 

 pairs ,6't9 cm. lopg, about 2 cm. broad, on short, 'margined petioles which 

 dilate ai base to form the sjiort sheaths; the upper pairs' sessile, shorter: heads 



i3-5, 10-i'2,mm.'high, or 'sometimes more numerous aiid then smaller; pedun- 

 ' cles mostly short, erect, the lateral Often exceeding the tyriiiinal'j'iiivolucre 

 campanulate, the bracts itiuch shorter than the disk, narrowly 'Oblong, 'pb- 

 tusi^h: corolla lon^-piibesceht bn'the tube, sprhetimesi few' straggling hairs 

 On the lobes: achenes linear, almbst glabrous: ji^jpus fulvous or dirty-white. 

 [A. lariuldsa Greene, PI. Baker. 3': 261' Nov., 190f.]-^In the mountains of our 

 range. ', '' ' ' , '■■■■''''"■''■.'■.' 



9. "Ariiica fbliosa Nutt.* Trans'. Am. Phil. S6c. 7: 407. 1841. Stents frorn 

 slender 'horizontal 'rootstocks, 'slender, Jj-4 dm", high, erect, leafy, ihore or 

 less finely gi-anular-glanldular and pubescent: leaves 6-10 pairs, asbe^ding or 

 erect, broadly to nan'owly lanceolate, entire, &ubaciite or obt^Se, smaller 

 upwardj all /but the uppertnoSt much exceeding the short interriodes; petioles 

 slender, dilated at the basfe'and cOimate, tK6 pair .forming a'sheath which iii 

 the lowest leaves is 2-3' 6rti. Ibnfc the' sheath and petioles gradually shorter 

 upward to about the niiddle of tbe stem' where both become wholly absent; 

 heads l-gevera-i; if ip.ore than 3,' mostly spimewhat racemose; terminal head 



* A. exigva A. Nela.Bot. Gaz..30: 202. 1900, may orjmaynot be distinct from ttis.,,lt is 

 dwarf,, branched, and, poly cephalous, and w^th the pul:)escence of A. rhizomata, — ^^Shores of 

 Yellowstone Lake. ' i ■ . , , , , 



