68 WILLOW FAMILY 



The meadows of Yosemite and other low valleys are bor- 

 dered by thickets of the Arroyo Willow, which forms rounded 

 clumps 10 to 20 ft. high. It is sometimes called White 

 Willow. 



7. S. cordata var. mackenziana Hook. Leaves narrowly 

 oblong, rounded to a broad base, slenderly acute, glabrous, 

 pale beneath, 1 to 3 or 4 in. long, Y* to 1^2 in. wide; stipules 

 conspicuous and rounded or early deciduous. Catkins 1 to 

 1^4 m - l° n g> tne leaves of the peduncles falling early. Style 

 long, with short bifid stigmas. Capsules glabrous, slender- 

 pediceled. — A rare shrub, found near Sentinel Hotel in the 

 Yosemite and at Johnson Lake. 



8. S. macrocarpa var. argentea Bebb. Silver Willow. 

 Leaves lanceolate, entire, acute at both ends, appressed-silky 

 beneath, becoming green above, 1 to \y 2 in. long, f£ i n - o r 

 less wide; stipules none. Catkins 24 in. or less long. Style 

 very short. Capsules densely short-pubescent. 



The smooth, silvery-pubescent foliage and short, thick 

 catkins best mark this beautiful willow (see also S. sitchensis). 

 It is a slender, white-twigged shrub, 6 to 18 ft. high, and 

 grows only in the higher valleys, as along the Lyell Fork of 

 the Tuolumne, and Walker Lake, Mono Co. 



9. S. glauca var. villosa Anders. Leaves lanceolate to 

 oblanceolate, acute, narrowed at base, entire, 1 to 3 in. long, 

 J4 to Yz in. wide, soft-pubescent when young; stipules lance- 

 olate or none. Catkins on short leafy peduncles, the pistil- 

 late 1 to 3 in. long, their scales brownish and hairy. Stigmas 

 either entire or lobed. 



This shrub (2 to 12 ft. high) forms thickets along the 

 shores of lakes and on moist banks. It is the most common 

 willow of upper altitudes, ranging from 7000 ft. to timber- 

 line. 



10. S. californica Bebb. Doubtfully distinct from no. 9, 

 differing chiefly in its very finely toothed leaves. It grows 

 at Snow Flat and probably elsewhere in the range of S. glauca 

 villosa. 



S. lemmonii Bebb, is a doubtful species close to S. glauca 

 and reported from our higher mountains. It is described as 

 a tall, slender shrub with nearly glabrous leaves, the scales 

 of the catkins pitch-black. 



11. S. arctica var. petraea Anders. Alpine Willow. Leaves 

 lanceolate, tapering to each end, entire, about 1 in. long, Ya to 

 y 2 in. wide, glabrous. Catkins erect, 1 or 2 in. long. Capsules 

 silky. 



