WILLOW FAMILY 



501 



2, filaments glabrous, free ; the pistillate 2-4 cm. long, slender, lax at base ; capsules lanceolate, 



sessile, gray-tomentose, 4-6 mm. long; styles 1-1.5 mm. and stigmas 0.5 mm. long; scales 



broadly oblanceolate to obovate, often somewhat erose, brown to blackish, long-pilose within, 



thinly so without. 



Alpine summits, 8,000 to 14,000 feet, Boreal Zones; Selkirk Mountains, British Columbia, and Rocky 

 Mountains of Alberta, south in the liocky and Wasatch systems, to northern New Mexico and Utah. 

 Rare in northeastern Oregon. Type locality: "in summits Rocky Mountains," probably Alberta. 



Salix petrophila caespitosa (Kennedy) Schneider, Bot. Gaz. 66: 136. 191cS. (Sali.v caespitosa Kennedy, 

 Muhlenb. 7: 135. pi. 9, 1912.) Leaves acute at both ends, or apex subacuminate, more or less densely pilose- 

 tomentose above, glabrate beneath, scales narrower. 



Alpine summits, 9,000-11,000 feet, Sierra Nevada Mountains, Sierra to Fresno Counties, California, and 

 adjacent Washoe County, Nevada. Type locality: "Mount Rose, Washoe County, Nevada." 



30. Salix monica Bebb. 

 Mono Willow. Fig. 1219. 



Salix monica Bebb, Willows Calif, (repr. S. Wats. Bot. 

 Calif. 2: 90.) 1879. 



Sali.v chlorophytla of various western authors, for the 

 most part; not Anderss. 1867. 



Sali.v planifolia monica (Bebb) Schneider, Jour. Arnold 

 Arb. 1: 78. 1919. 



Twigs glabrous, bright chestnut to deep 

 rich brown ; leaves broadly elliptic-ovate or 

 obovate, 2-3.5 cm. long, 0.8-2 cm. wide, obtu:ie 

 at both ends or acutish at the base and ab- 

 ruptly acute at the apex, entire or nearly so ; 

 buds large, chestnut or darker ; aments ap- 

 pearing with the leaves, 1-3 cm. long, 1-1.3 

 cm. wide, sessile ; scales ovate, acute, clothed 

 on both sides with long yellowish-white hairs ; 

 capsules ovate-conic, 4-6 mm. long; styles 1- 

 1.5 mm. long, somewhat pubescent at the base; 

 stigmas thick, mostly entire, 0.3-0.7 mm. long; 

 stamens 2, filaments free. 



Apparently differs from 5. planifolia Pursh in smaller leaves; sessile, denser, smaller aments; and 

 shorter styles and_ stigmas. Until the identity of 5. chlorophylla Anderss. is settled I prefer to retain 

 Bebb's name. 



Alpine situations, 8,000-13,000 feet. Boreal Zones; central Sierra Nevada, western Montana to northern 

 New Mexico, in the Rocky and Wasatch systems. Type locality: "Mono Pass Summit," Mono County, 

 California. 



31. Salix pennata Ball. Feather-vein Willow. Fig. 1220. 



Sali.v pennata Ball, Bot. Gaz. 60: 45. /. 1. 1915. 



Low shrub with dark, divaricate, stoutish, 

 glabrous branchlets and large chestnut-color- 

 ed buds ; leaves obovate or elliptic-obovate, 

 3-6 cm. long, 1.5-3.5 cm. wide (4x2, 5x2.5), 

 acute, narrowed at base, entire, very dark 

 green above, glaucous beneath, the raised 

 midrib and parallel primary veins conspicu- 

 ous beneath, glabrous ; aments sessile, stout, 

 pistillate 2.5-7 cm. long ; capsules subsessile, 

 6-8 mm. long, densely silvery pubescent ; 

 style about 1.4 mm. long; stigmas 0.5 mm. 

 long; scales obovate, acute, black, densely 

 pilose ; stamens 2 ; filaments glabrous, free. 



At 4,000 to 6,000 feet on slopes of the high peaks 

 of the central Cascade Mountains, Mount Hood, 

 Mount Adams, Mount Rainier, Boreal Zones. Type 

 locality: "Mount Paddo [Adams]," Pierce County, 

 Washington. 



