WILLOW FAMILY. 



137 



4. S. fluviatilis Nutt. var. argyrophylla (Sarg.). Sand-hak 

 Willow. Shrub, 4 to 8 ft. high; leaves linear, acute or acuminate, 

 2 to 3 in. long and 1 to 2 lines wide, sessile or nearly so, lustrous- 

 silky when young, more or less glabrate in age, entire or obscurely 

 denticulate; stipules early deciduous; aments (catkins) linear, borne 

 on lateral leafy branchlets of the season, often clustered; bracts 

 yellowish, villous, deciduous; capsule shortly pediceled, usually 

 tomentose; stigma large, sessile. — (S. longifolia Muhl. of Bot. Cal.) 



Very common in beds of arroyos and rivers, forming dense clumps 

 on sand and gravel bars. Lower Sacramento; Alameda Co., etc. 



5. S. sessilifolia Nutt. Very similar to the last; leaves narrowly 

 lanceolate, green on both surfaces, pubescent or more or less glabrous; 

 stipules acute; bracts oblanceolate, villous; capsules mostly tapering 

 to a beak,- sessile or nearly so, densely pilose when young; style short 

 but distinct; stigmas deeply bifid with linear lobes. 



Very common along rivers and in stream beds, in the Coast Ranges 

 and Sacramento Valley. 



6. S. lasiolepis Benth. Arroyo Willow. Shrub or tree, 10 to 

 18 ft. high; mature leaves oblong or slightly broadest above the 

 middle, obscurely serrulate, dull green above, gray pubescent beneath, 

 £ to £ in. broad, 2 to 3 in. long on petioles 2 to 5 lines long; aments 

 appearing before the leaves, densely silky tomentose in the bud, 

 suberect; staminate aments £ to 1£ in. long, stamens 2; pistillate 

 aments 1 in. long or less, in fruit 2 in. long or somewhat more. 



Coast Ranges and Lower Sierras: the most common willow, filling 

 river and creek beds and following drv gulches to their sources in the 

 hills. Feb. 



7. S. Nuttallii Sarg. var. brachystachys Sarg. Tree 25 ft. high 

 with a trunk f to 1£ ft. in diameter or a shrub only 4 {o 8 ft. high; 

 the branchlets commonly with very dark bark; leaves broadly obovate 

 or oblong-obovate, 1 to 1£ in. long; staminate aments \ to 1£ in. long, 

 its bracts obovate, rounded, black or black-tipped, hairy-pubescent, 

 those of the female flower similar; stamens 2, long exserted; pistillate 

 aments oblong, \ to £ in. long or in fruit H in. long; ovary short- 

 silky; stigmas divided into linear lobes, seeming as if 4; capsule less 

 silky than the ovary. — (S. flavescens Nutt.) 



Coast Ranges near the coast, on mountain sides. Flowering in 

 winter. In the Oakland Hills it grows in clumps about springs or in 

 moist hollows on north slopes, and is very straggling and ancient 

 looking. The author is indebted to Mr. Harry A. Dutton of Stanford 

 University for a note on its occurrence as a tree in the Santa Cruz 

 Mountains. 



8. S. Sitchensis Sanson. Velvet Willow. Arborescent or 

 shrubby, 15 to 25 ft. high; leaves oblong-ovate to oblanceolate, acute 

 or rounded at apex, cuneate at base, densely tomentose and lustrous- 

 silky beneath, dark-green and almost glabrous above, 2 to 4 in. long, 

 sometimes, especially toward the south, very thick and leathery; 

 staminate aments slender, white or silky with very long hairs which 



