106 Rhodora [May 
horizontali vel oblique adscendente; caule solitario (rarissime 2-3) 
piloso supra sparse villoso-hirsuto 0.8-2.5 dm. alto; foliis rosulatis 
lanceolato-elliptieis 3-10 cm. longis 0.5-2 cm. latis subacuminatis 
basi angustis plus minusve petiolatis supra papillosis vel sparsissime 
villosis glabratisque ci iatis margine calloso-serratis, dentibus 3-7- 
jugis; foliis caulinis 1-2-jugis, inferioribus oblanceolatis vel oblongis 
vel lanceolato-ovatis remote serratis vel integris glabris vel papillosis, 
superioribus valde reductis apice calloso-subulatis; pedunculis 1-3 
nudis vel bracteolatis, bracteolis linearibus apice subulati-filiformibus; 
capitulis 2.5-4 em. diametro; involucro 1-1.5 em. alto basi minute 
piloso supra glabro; bracteis S-10 anguste rhomboideis 2-3 mm. latis 
acuminatis ciliatis dorso glabris, paginis interioribus apice villosis; 
ligulis 9-12 luteis, lamina 1-1.5 em. longa 4-5 mm. lata 7-9-nervata 
apice 3-dentata, dentibus longioribus 0.5-1 mm. longis; corollis disci 
6-7 mm. longis, tubo villoso 2.5-3.5 mm. longo; achaeniis 3-3.5 mm. 
longis glabris vel ad apicem sparse breviterque hirsutis; pappo 6-7 
mm. longo albo, setis barbellulatis.—Matane County, QUEBEC: moist 
rock-walls and shelves of hornblende-schist at head (altitude about 
1070 m.)of Big Chimney, Mt. Mattaouisse, July 8, 1923, M. L. Fernald, 
Ludlow Griscom, K. K. Mackenzie, A. S. Pease & L. B. Smith, no. 
26,082; same station, August 20, 1923, Fernald & Smith, no. 26,085; 
dry schistose crests and talus of Razorback Ridge (altitude 850-1000 
m.), Mt Logan, July 13, 1923, Pease & Smith, no. 26,083; cold chim- 
neys in the schist at about 900-1000 m. altitude, south of Fernald 
Pass, Mt. Mattaouisse, August 20, 1923, Fernald & Smith, no. 26,084 
(TYPE in Gray Herb.). 
Named for Ludlow Griscom, professional — keen 
amateur botanist, tireless explorer and choice companion, who first 
discovered the plant which subsequently proved to be somewhat 
generally distributed on the cold walls of Mts. Mattaouisse and 
Logan. 
Arnica Griscomi belongs to the group of species nearly related to 
A. alpina. From all of them it is distinguished by its achenes being 
glabrous at base or often nearly throughout; A. alpina, A. plantaginea, 
A. chionopappa, A. gaspensis and A. arnoglossa Greere, the five 
species to which it is most nearly related, having the achenes densely 
hirsute with omparatively long trichomes. In A. alpina, further- 
more, the entire basal leaves are very narrow, and the involucre is 
densely lanate at base and it has more numerous and narrower bracts. 
A. chionopappa has the more numerous linear- or lance-attenuate 
bracts villous throughout, the ligules more numerous, the villous 
portion of the disk-corolla longer, and the achenes longer; A. planta- 
ginea has the stem glabrous or essentially so at base but distinctly 
glandular above and its leaves are entire; A. gaspensis (which is 
