Salicaceae 119 
cel |—2 mm. long; style about 0.5 mm. long; stigma short, notched or bifid. W.C. E. 
(S. fendleriana; S. lasiandra lyallii; S. lasiandra caudata. ) 
S. lasiandra, Benth. (Gland Willow) 
Subgenus LONGIFOLIAE—Shrubs or trees: stems gray to light brown; twigs 
slender, brown to reddish, often shining. Leaves linear to linear-lanceolate or narrowly 
elliptical, remotely denticulate or entire; petiole very short or none: stipules present or 
none. Aments terminating lateral leafy branches, the staminate often and the pistillate 
occasionally in 2’s or 3’s; scales light-yellow, deciduous. Stamens 2; filaments hairy 
below. Capsule glabrous to thinly villous, 4—7 mm. long; style none; stigma short 
(ours), bifid. 
A. Leaves linear or linear-lanceolate; blade widest below the middle, entire or remotely 
denticulate; pistillate aments 10—-20 mm. wide. 
B. Leaves canescent or silky at least beneath; pedicel of capsule 0—0.7 mm. long. 
C. Stigma short and thick; stipules none; twigs glabrous. 
D. Capsule glabrous; leaves canescent on both surfaces or silky-tomentose be- 
neath, rarely on both sides on very vigorous shoots. W. E. 
S. exigua Nutt. 
DD. Capsule pubescent; leaves appressed-silky on both sides. E. 
S. argophylla Nutt. (Spotted Willow) 
CC. Stigma long and slender; stipules present, acute, deciduous; twigs hoary- 
pubescent. W. S. sessilifolia Nutt. (Silver-leaf Willow) 
BB. Leaves glabrous on both sides; pedicel of capsule 0.51.5 mm. long. E. CS: 
fluviatilis tenerrima; S. longifolia tenerrima.) 
S. fluviatilis Nutt. (Sand-bar Willow) 
AA. Leaves elliptical to oblanceolate; blade widest at or above the middle, rather 
closely denticulate; pistillate aments 7—-8 mm. wide. W. E. 
S. melanopsis Nutt. (Dusky Willow) 
Subgenus CORDATAE—Shrubs, 2—5 m. high; stems densely caespitose; twigs 
brown to yellow, mostly slender, shining. Leaves linear-lanceolate to ovate or broadly 
oblanceolate, rounded to long-acuminate; stipules glabrous or hairy beneath; buds and 
slender petioles yellowish. Aments appearing before or with the leaves, rather slender, 
subsssile or on short bracted peduncles; scales tawny to fuscous. Capsule glabrous, pedi- 
celed; style present. 
A. Leaves glaucous, or at least distinctly pale beneath. 
B. Most of the leaf-blades widest below the middle. W.E. (S. cordata angus- 
tata; S. cordata watsonti; S. lutea.) 
S. cordata Muhl. (Heart Willow) 
BB. Most of the leaf-blades widest above the middle. 
C. Bracts below the ament oblanceolate; scales long-hairy, obtuse or rounded. 
W. E. S. piperi Bebb 
CC. Bracts below the ament lanceolate; scales glabrous, acute. E. (5 cordata 
mackenziana. ) S. mackenziana Barr. 
AA. Leaves deep-green on both sides, never pale beneath. : 
D. Leaves elliptic-oblong to oblong; ament-peduncles 1—2 mm. long; stipules 
ovate to lanceolate. E. §. pseudomyrsinites Anders. 
DD. Leaves ovate to obovate; ament-peduncles 2.5—-4 mm. long; stipules lunate 
to broadly ovate. E. S. pyrifolia Anders. (Pear Willow) 

