90 SALICACE.E. Salix. 



as in that species. S. subcordata, Anders., similarly distinguished from S. glance,, differs in its 

 orbicular-oval leaves and large semicordate denticulate stipules. 



17. S. arctica, Pallas. Leaves obovate, oval, or spatulate-lanceolate, entire or 

 obsoletely and remotely serrate, at length smooth, glaucous beneath : aments lateral 

 and somewhat terminal, upon long strict leafy peduncles, erect, rather thick and 

 densely flowered : scales obovate, obtuse, pale or dark colored, pilose : capsule conic 

 from an ovate base : style medium sized, becoming brown : stigmas divaricately 

 parted. Anders, in DC. Prodr. xvi 2 . 286; Watson, Bot. King Exp. 326. 



Var. petraea, Anders. 1. c. A dwarf creeping shrub, Avith suberect branches leafy 

 at the top, only 2 to 4 inches high, though often covering considerable surface : 

 leaves lanceolate, tapering somewhat equally to the base and apex (an inch long by 

 3 to 6 lines wide), entire, green on both sides, slightly paler and prominently nerved 

 beneath : aments terminal, erect, at length thick and densely flowered, an inch or two 

 long : scales thin, brownish, sparsely pilose : capsules ovate-conical, 2 or 3 lines long, 

 silky, subsessile, the nectary rather exceeding the base of the capsule : style very 

 much elongated, slender : stigmas bifid, divaricate. 



In various forms from Greenland and Labrador to Alaska. The variety pctrcca in the Sierra 

 Nevada at 9,000 to 11,000 feet altitude (Anderson, Brewer, Bolandcr, Lemmon), and also on alpine 

 summits of the Rocky Mountains from Colorado, where it is frequently collected, northward to 

 British America (Bourgeau, Lyall); an alpine form of the species, and the only one known to 

 occur within the boundaries of the United States. 



18. S. Monica, Bebb. A small alpine shrub, profusely branched, procumbent 

 but not creeping ; branches smooth : leaves oblanceolate or oblong, ^ to 1 inch long, 

 3 or 4 lines wide, acute at both ends, or the lower obtuse, entire or obscurely ser- 

 rate, glabrous, bright green and with regularly radiating parallel impressed nerves 

 above, paler but not glaucous beneath ; stipules none : aments lateral, diminutive, 

 roundish, densely flowered, sessile or on very short but distinct peduncles, with two 

 oblong leaf-like bracts at base ; scales in the fertile ament roundish-ovate, rather ob- 

 tuse, dark colored and slightly villous, in the staminate ament Ungulate, much nar- 

 rower, longer, paler, very acute and nearly smooth : filaments long ; anthers after 

 flowering brownish : capsules minute, a line long, ovate-conical, silky-tomentose, 

 sessile : styles medium sized, not produced ; stigmas mostly entire, spreading. 



Mono Pass summit ; June, Bolandcr. A clear species of the Myrlosalix section ; differing 

 widely from S. tcnera, Anders, (from the Cascade Mountains, 7,000 feet altitude, Lyall), with which 

 alone it can be compared, that having gracefully slender aments terminating lateral branches, 

 lingulate leaves, and the relative form of the scales of the male and female aments singularly re- 

 versed, as it were, from what they appear in S. Monica. 



4. Stamen solitary. Aments thick, densely villous, appearing in the axils of the 

 ri(j id persistent leaves. {A purely arbitrary and provisional arrangement.) 



19. S. Coulteri, Anders. Recent branches very stout, furrowed, and densely gray- 

 ish-tomentose : leaves crowded, thick and becoming rigid, oblong, about two inches 

 long by an inch wide, acute at each end, dull green and glabrate above except the 

 whitish impressed midrib and nerves, beneath very densely clothed with a soft per- 

 sistent white tomentum, the margin revolute and entire ; petioles short and stout, 

 dilated below and embracing the large roundish obtuse silky buds ; stipules varying 

 from reniform to lanceolate with an oblique point : staminate aments sessile [always 1 ?], 

 cylindrical, erect, densely flowered ; scales spatulate, pale, densely villous with very 

 long silky hairs, which conceal the filament of the single stamen found under each 

 scale. 



Known only from staminate aments collected by Coulter, but locality uncertain, and by Bolander 

 near San Francisco ("a single tree, 15 feet high ; common in Mann County"). In one specimen 

 the aments (about an inch long) appeal' in the axils of the persistent leaves. The dense wool- 

 liness of the under surface of the leaves is dull white rather than silky, at length apparently fer- 

 ruginous, disappearing only from the prominent midrib. 



