1918] SCHN EIDER—AMERICAN WILLOWS 135 
rhachi parteque nudo pedunculi pl. m. villosa; mascula vix ad 
I.5:0.7 cm. magna, bracteae et cetera ut in aratoclada, glandula 
dorsalis (an semper ?) nulla; feminea sub anthesi 1-2:0.5-0.7 cm. 
magna, fructifera vix ad 3 cm. longa et 1.2 cm. crassa, bracteae ut 
in masculis; ovaria ovoideo-oblonga, pl. m. sessilia; styli distincti, 
saepe apice breviter bifidi, stigmatibus brevibus oblongisve paullo 
vel ad 2.5plo longiores, glandula ut in varietate precedente; 
fructus ovato-conici, subsessiles, ad 6 mm. longi, laxius quam 
ovaria villoso-tomentosi vel anni praeteriti subglabrescentes. 
Type LocaLiry.—Gaspé Peninsula, serpentine slopes of Mt. Albert. 
RANGE.—As above. 
SPECIMENS EXAMINED,—Canapa: Quebec, Gaspé Peninsula, Mt. Albert, 
serpentine slopes, July 23, 1906, M. L. Fernald and J. F. Collins (no. 500, f., 
fr., type; G.); exposed serpentine barrens, alt. tooo m., August 9, 1905, 
Collins and Fernald (no. 61, m., f.; G., N., O.); sheltered money knolls, Au- 
gust 10, 1905, Collins and Fernald (no. 61°, f.; G., N.,O.; a precedente nonnisi 
petiolis vulgo longioribus differe videtur); on wet serpentine slopes, July 23, 
1906, Fernald and Collins (no. 511, fr.; G.; forma gracilis juvenilis, habitu S. 
petrophilae valde similis); north slope of same mountain, on hornblende schist, 
July 26, 1906, Fernald and Collins (no. 504, f. defl.; G.; forma satis vegeta, 
ramulis elongatis, foliis pl. m. plicato-acuminatis). 
At first sight this variety much resembles S. petrophila in its habit, the 
shape of the leaves, and the yellowish color of the young twigs, but the leaves 
are of a deeper green on the upper surface and much paler and glaucescent on 
the lower surface, and do not differ in this respect from any other form of 
S. anglorum. It is, however, much easier to distinguish herbarium specimens 
of both species than to express the differences in exact words. The two species 
meet each other in the Rockies of Alberta and British Columbia, and there 
are also certain forms in northern Montana, and even in Wyoming which at 
present I am at a loss to determine. Some of them may represent hybrids 
between S. petrophila and other species with which I am not yet sufficiently 
acquainted. 
3. S. PETROPHILA Rydbg., in Bull. N.Y. Bot. Gard. 1:268. 1899, 
is the species which seems to be nearest related to S. anglorum. It 
was first described by ANDERSSON (DC., Prodr. 167:287. 1868) as 
S. arctica petraea from specimens collected by E. Bourgeau “in 
summo Rocky Mountains.’”’ I have seen a photograph of the type 
at Kew and a cotype in the Gray herbarium. Both specimens bear 
the label of Patuiser’s Brit. N. Am. Expl. Expedition, with the 
printed indication “(Rocky Mountains” and “coll. E. Bourgeau 
