1921] BALL—WILLOWS 433 
Low shrub, 1-3 m. high; bark gray; branchlets slender, mostly 
elongated and virgate, sometimes shorter and divaricate, yellowish or 
bright chestnut to brown, glabrous, shining, full of leaf scars; buds 
slender, 4-7 mm. long, acute, chestnut to dark brown, glabrous, 
inconspicuous: leaves stipulate, petiolate; stipules narrowly ovate 
to lunate, crenate-serrulate to denticulate, color and texture as in 
blades; petioles slender, 4-8 or 10 mm. long, or to 15 mm. long 
on sprout leaves, yellowish to dark brown, glabrous or puberulent; 
blades elliptic-oblanceolate to obovate-oval or ovate, acute to 
short-acuminate, or distal ones acuminate, 4-8 cm. long, 1. 5-4 cm. 
wide, common sizes being 4 by 2, 5 by 2.5, 6 by 2.5-3.3, 7 by 2.5~ 
3-5, 8 by 3, rounded to truncate or slightly cordate at base, glandu- 
lar crenate-serrulate, those on luxuriant sterile branchlets and 
sprouts much larger, 8 by 4 or 10 by 3.5 cm., all thin, translucent, 
deep rich green on both sides, primary and secondary veins slender 
and somewhat raised on both surfaces, glabrous, at first thinly 
pilose-pubescent: aments slender, lax, appearing with the leaves, 
on short leafy peduncles; pistillate peduncle 5-8 or sometimes 
13mm. long, pubescent, bearing 2-4 small leaves 1-3 cm. long; 
staminate aments nearly sessile; pistillate ament 2.5—-6 cm. long, 
I.5~2 cm. wide, lax; capsule lanceolate or rostrate from a sub- 
ovoid base, 5-7 mm. long, glabrous; pedicel slender, 2-4 mm. 
long; style o.4-0.6 mm. long, stigmas short, stout, mostly notched; 
scales elliptical-oblong or oblanceolate, light brown, drying black, 
acute or obtusish, thinly clothed outside and more densely so 
inside with long crinkly hairs; gland 1, linear-clavate, elongated, 
sometimes 1.3mm. long, usually shorter; staminate aments 
sessile, 2.5-6 cm. long (subtended by 2-3 leaves 1-2 cm. long), 
Icm. wide, slender, scales as in pistillate aments; stamens 2, 
filaments glabrous, united for o.5-o.7 of their length. 
S. monochroma ranges from the Yellowstone Park of northwestern Wyoming 
and adjacent Montana to the Willamette Valley of western Oregon and north 
to southern British Columbia and southern Alberta. It is a shrub of stream 
banks in the mountains of this section. Apparently it ranges in altitude from 
about sea level (Portland) to 5000 or 6000 ft. (1500 to 1800 m.) in the moun- 
tains, or occasionally to somewhat higher elevations. The flowers appear 
from about April 15 to May 15, and fruit follows in due season. At the higher 
altitudes the dates are considerably later. The writer was in error in placing 
