WILLOW FAMILY 341 



entire, % to 1% inches broad; catkins on short leafy peduncles. San Fran- 

 cisco, where first collected by Bigelow, and elsewhere in the Bay region. 



Refs. SALIX LASIOLEPIS Bentham, PI. Hartw. p. 335 (1857), type loc. Salinas and Carmel 

 rivers, Hartweg ; Jepson, Fl. W. Mid. Cal. p. 137 (1901). Var. BIGELOVII Bebb in Bot. Cal. 

 vol. 2, p. 86 (1880); S. ~bigelovii Torrey, Pae. K ; Kep. vol. 4, p. 139 (1857). S. franciscana 

 Seeman, Bull. Torr. Bot. Club, vol. 30, p. 634 "(1903), the type from "Cliff House, San 

 Francisco." S. bakeri Seeman, 1. c. p. 635, type from "foothills near Stanford University." 



7. S. cordata Muhl. var. mackenziana Hook. MACKENZIE WILLOW. Shrub; 

 leaves oblong-lanceolate, narrowed to the subcordate or truncate base and 

 tapering into the pointed apex, entire or serrulate, glabrous, light green above, 

 often glaucous beneath, 1 to 2 l / 2 (or 4) inches long, !/o to % (or l 1 /^) inches 

 broad; petioles 1 to 3 lines long; stipules orbicular, early deciduous or none; 

 catkins subsessile or shortly peduncled. especially the pistillate, sparingly 

 leafy-bracted, dense, 1 to 1% inches long, 3 to 4 lines thick; scales narrow, 

 dark or black, the lower part villous with long white hairs ; stamens 2, filaments 

 glabrous, elongated, free or more or less united; style long, stigmas short, 

 bifid; fruiting catkins 1 to 1% inches long; ovary and capsule glabrous; 

 pedicel 1 line long. 



High mountains: Sierra Nevada (Mariposa and Calaveras cos.); Lake Co. 

 (ace. Bebb) and far northward. Apparently rare in California. Our form 

 has shorter and less leafy peduncles than the type of the Eocky Mts. 



Var. watsoni Bebb. Branches smooth, polished, yellow; leaves dark green, 

 smaller, oblong, short-acuminate, serrulate or subentire, 1 to 3 inches long; 

 stipules small or none; catkins 1 inch long, crowded. High montane, 6,000 

 to 9,000 feet ; San Jacinto Mt., northern Sierra Nevada and eastward to Utah. 



Eefs. SALIX CORDATA Muhlenberg in Ges. Naturf. Fr. Neue Schr, vol. 4, p. 236 (1803), 

 Var. MACKENZIANA Hooker, Fl. Bor. Am., vol. 2, p. 149 (1853). Var. WATSONII Bebb in Bot. 

 Cal. vol. 2, p. 86 (1880); Jones, Willow Fam. Great Plateau, p. 13 (1908). 



8. S. flavescens Nutt. NUTTALL WILLOW. Shrub 2 to 15 feet high or a 

 small tree 25 feet high; branchlets with whitish or very dark bark; leaves 

 broadly obovate or oblong-obovate, entire, rounded at apex or shortly acute, 

 1 to iy 2 (or 4) inches long, y 2 to l 1 /^ inches broad, yellow-green and lustrous 

 above, yellow-veined, glabrate or densely short-silky beneath; petioles 4 lines 

 long; catkins appearing before the leaves, oblong or elliptic, % to 1 inch long, 

 5 to 7 lines thick, sessile; scales obovate, rounded at apex, black or black- 

 tipped, covered with white hairs; stamens 2, conspicuously long-exserted, fila- 

 ments glabrous; ovary white-silky; style none, stigmas broadly linear, some- 

 times notched at apex ; capsule less silky than the ovary. 



Sierra Nevada, 4,000 to 10,000 feet, and seaward Coast Ranges, southward 

 to the San Bernardino Mts., northward to the Siskiyous (W.L.J. no. 2947), 

 and far north to British Columbia and throughout the Rocky Mts. in the 

 United States. Highly variable in both Coast Ranges and Sierra Nevada. 

 The form found at Monterey (S. brachystachys Benth.) is matched by a like 

 form in the Sierra Nevada. Type loc. Rocky Mts. lat. 39, Thos. Nuttall 

 (Wyeth Exped.). 



Kefs. SALIX FLAVESCENS Nuttall, Sylva, vol. 1, p. 65 (1842), not of Host; Bebb in Bot. 

 Cal. vol. 2, p. 86 (1880), in part. S. nuttallii Sargent, Gard. & For. vol. 8, p. 463 (1895). 

 Var. brachystachys Sargent, Silva N. Am. vol. 9, p. 142 (1896) ; Jepson, Fl. W. Mid. Cal. 

 p. 137 (1901). 



9. S. macrocarpa Nutt. var. argentea Bebb. SILVER WILLOW. Slender 

 shrub 6 to 16 feet high with numerous stems from the base and very slender 



