50 American Midland Naturalist Monograph No. 4 



28. Arroyo Willow (Salix lasiolepis Benth.). — Shrub or small tree 

 6 to 30 feet high with many stems from the base, commonly found along 

 rocky streams; leaves narrowly reverse-egg-shaped to reverse-Iance-shaped or 

 rarely almost linear, 2 to 5 inches long, 1/2 to 1 inch wide, dark green and 

 smooth above, whitish and often hairy below, the margins not toothed or 

 scarcely so; catkins naked at base, appearing before the leaves, 1 to 2% inches 

 long in fruit; scales brown, densely long-hairy; stamens 2, the filaments joined 

 at base, not hairy; capsules smooth or very thinly hairy, borne on short 

 stalks, the styles 1/2 to 1 mm. long. 



Occurrence. — yosemite. kings canyon: switchbacks on Bubbs Creek trail. 

 SEQUOIA: Hospital Rock. 



29. Farr Willow (Salix Farrae Ball) . — Small shrub about 1 to 2 feet 

 high; branchlets red or reddish-yellow, shiny; leaves elliptic to broadly lance- 

 shaped, % to 2 inches long, whitish below, not toothed or scarcely "So; catkins 

 appearing with the leaves, borne on short leafy stalks; scales brownish at tips, 

 hairy on inside; stamens 2; capsules smooth, borne on stalks 1 to 1^/2 num. 

 long, the style short, i^ mm. or less. 



Occurrence. — GLACIER, frequent en east side in bogs or wet places, 5,500 to 6,500 

 feet: Gunsighl Pass trail above Gunsight Lake; side of Bear Hat Mountain above Hid- 

 den Creek. YELLOWSTONE. 



30. Mackenzie Willow (Salix Mackenziana Barr.). — Shrub or small 

 tree 6 to 12 feet high; branchlets dark brown or yellowish, shiny; leaves lance- 

 shaped to oblong-lance-shaped, finely glandular-toothed, 2 to 4 inches long; 

 dark green above, whitish below; catkins appearing with the leaves, borne on 

 short leafy stalks; scales dark, hairy; stamens 2, the filaments distinct, not 

 hairy; capsules smooth, on stalks 2i/2 to 4 mm. long, the styles short, about 

 i/^ mm. long. (Syn. Salix cordata Muhl. var. Mack^nziana Hook.). 



Occurrence. — MOUNT RAINIER, not common. YOSEMITE, 4,000 to 6,000 feet: Yo- 

 semite Valley; Illilouette Canyon; Little Yosemite. SEQUOIA: head of Tocopah Can- 

 yon. GLACIER, rare: Belton. YELLOWSTONE: Mount Evarts; Gardiner; Mammoth; 

 vicinity of Rustic Falls; near Fountain Geyser. 



3L FiRMLEAF Willow, False Myrtle Willow (Salix pseudocordata 

 (Anderss.) Rybd.). — Low shrub often foimd growing in dense thickets in 

 wet meadows or bogs; leaves lance-shaped, smooth, thick and firm, the margin 

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

 brownish; stamens 2, the filaments distinct, smooth; capsules smooth, on stalks 

 1 to 1^2 n^iTi- lor^gj the styles ^2 to % mm. long. (Syn, Salix psendomyr- 

 sinites Anderss., in part.) 



Occurrence. — crater lake: near west boundary of park; Boundary Spring; Sand 

 Creek. LASSEN: Summit Lake, 6,950 feet. KINGS CANYON: Harrison Pass trail. 

 SEQUOIA: south end of Crescent Meadow; between Little Five Lakes and Kaweah Gap. 

 GLACIER: Blackfeet Highway near Two-Medicine Ridge. YELLOWSTONE: Tower Falls; 

 Swan Lake; Cooke City road. ROCKY MOUNTAIN: Bear Lake; Grand Lake. BRYCE 



CANYON. 



32. Yellow Willow (Salix lutea Nutt.). — Erect shrub 6 to 12 feet 



