Bailey 6c Bailey: Woody Plants of National Parks 51 



high with stems clustered at base; branchlets yellowish; leaves narrowly egg- 

 shaped to narrowly lance-shaped, I1/2 to 31/2 inches long, thinnish, yellow- 

 green above, whitish below, the margins finely toothed or not toothed; catkins 

 scarcely stalked, leafy-bracted at base, appearing with the leaves; scales brown- 

 ish, thinly hairy; stamens 2, the filaments distinct, not hairy; capsules smooth, 

 on short stalks % to 2 mm. long, the style less than 1/2 mm- long- Syns. 

 S. Watsoni Rydb., vS". cordata Muhl. var. lutea (Nutt.) Bebb). 

 Occurrence. — ROCKY mountain, bryce canyon, zion. 



33. Greensides Willov/ {Salix moncchroma Ball). — Much-branched 

 shrub or tree sometimes 20 feet high; branchlets reddish or olive, smooth and 

 shiny; leaves dark green, reverse-egg-shaped to broadly lance-shaped, rounded 

 or heart-shaped at base, about 3 inches long, thinnish, the margins finely 

 toothed; catkins leafy-bracted at base, appearing with the leaves; scales brown- 

 ish, silky-hairy; stamens 2, the filaments smooth, joined at base; capsules 

 smooth, on stalks about 3 to 4 mm. long, the styles less than 1 mm. long. 

 This species furnishes excellent browse for animals. (Syn. S. pyrifolia of 

 Coulter & Nelson, Man. Rocky Mtn. Bot., not Anderss.) 



Occurrence. — GLACIER. YELLOWSTONE: Stevenson's Island in Yellowstone Lake. 



34. Balsam Willow (Salix pyrifolia Anderss.). — Much-branched shrub 

 or sometimes a small tree with shiny reddish or olive twigs; leaves short-oval 

 to oblong-Iance-shaped, rounded or heart-shaped at base, thinnish, dark green 

 above, paler or whitish below, slightly glandular-toothed; catkins leafy-bracted 

 at base, appearing with the leaves; fruiting catkins very lax; scales persistent, 

 rather light, colored at the tips; stamens 2, the filaments smooth, distinct; 

 capsules smooth, distinctly pedicelled, the style short. (Syn. S. balsamifera 

 Barr.) . 



Occurrence. — ISLE ROYALE, common: Mott Island; Scoville Point; Raspberry Island. 



35. Silky-back Willow (Salix vestita Pursh). — Low shrub with as- 

 cending stems 1/2 to 4 feet high; leaves 1 to 2 inches long, broadly elliptic to 

 roundish, thickish, dark green and strongly veined above, densely covered 

 below with long white hairs, the margins not toothed; catkins appearing after 

 the leaves, on leafy stalks; stamens 2, the filaments distinct, hairy below; cap- 

 sules hairy, the style none. 



Occurrence. — glacier, common, 5,500 to 6,500 feet; Hanging Gardens below Logan 

 Pass; switchbacks below Swiftcurrent Pass; upper trail to Grinnell Glacier; Brown 

 Pass; switchbacks above Stoney Indian Lake; Hidden Canyon on side of Bear Hal 

 Mountain; Gunsight Pass. 



35a. (Var. erecta Anders.). — Similar to the species but the plants more 

 erect; leaves narrower, more pointed; plants often forming large dense patches. 

 (Syn. S. Fernaldi Blankinsh.) 



Occurrence. — glacier: Skyline trail to Granite Park, about 6,500 feet. 



36. ScoULER Willow (Salix Scoulenana Barr.). — Many-stemmed shrub 

 or small tree, 3 to 15 feet high, commonly occurring on dry open slopes in 



