1921] BALL—WILLOWS 429 
stamens 2, filaments slender, glabrous, free; scales as in pistillate 
ament. 
S. lutea ligulifolia is a mountain-loving form. It is found in the Rocky 
Mountain system from the Black Hills of South Dakota, and the Laramie 
Hills and Medicine Bow Mountains of southeastern Wyoming, south to 
southern New Mexico and central Arizona. An isolated distribution occurs in 
extreme western Nevada and the adjacent Yosemite Valley of California. 
It appears to be confined to stream banks in mountain canyons at elevations 
from 5000 ft. (1500 m.) to probably gooo ft. (2700 m.), although its upper limits 
are unknown as yet. It flowers from the last week in April until well into 
May, and fruits in due season thereafter. 
It is distinguished from typical S. Jutea by usually dark brown branchlets, 
longer and narrower, straplike, usually dark green leaves, with the margins 
often nearly parallel and usually entire or only shallowly serrulate. The 
capsules also are shorter and on fairly short pedicels. Specimens collected 
when the leaves are just unfolding resemble S. irrorata, but may be distinguished 
by somewhat lighter colored twigs, without the glaucous bloom, and by the 
broader, less oblanceolate leaves and longer pedicels. The following specimens 
are referred here. 
CALIFORNIA.—Yosemite Valley, H. N. Bolander 6331, June’3, 1866 (FBb 
6335, N). 
NeEvapa.— Washoe County, Hunter’s Canyon, vicinity of Reno, 1350- 
1500 m., A. E. Hitchcock 455, July 18, 1913 (N); no locality (probably Washoe 
County) Lieut. Wheeler, 1872 (N, twig densely pubescent); Soda Springs 
Canyon, Mineral (Esmeralda) County, W. H. Shockley 363, May 1886 (FBb). 
Arizona.— Grand Canyon, Indian Gardens, alt. 3800 ft., E. A. Goldman 
2237, August 25, 1913 (N, twig densely pubescent); Navajo County, Black 
Mesa Forest Reserve: Black Canyon, Houck’s Ranch, F. V. Coville 1084, 
June 5, 1900; along creek at Showlow, Coville 1091, June 8, 1900; 2022, July 4, 
1904 (N, both specimens with pubescent-pilose young twigs and broader and 
more serrulate leaves); Apache County, Springerville, alt. 7000 ft., E. A. 
Goldman 2446, June 8, 1915 (N); White Mountain Indian Reservation; 
watershed of White River above Ft. Apache, Coville 1977 (N 500630, type), 
1981, June 30, 1904 (N); White Mountains, south of Thomas Peak, Coville 2014, 
July 2, 1904 (N); along White River near Ft. Apache, Coville 2016 and 2020 
(seasonal twigs pubescent, leaves broader and more serrulate), July 3, 1904 
(N); White Mountains, head of Black River, L. N. Goodding 1212, July 18, 
1912 (N); White Mountain Apache Reservation, Myrile Zuck, June 25, 
1907 (N). 
Utan.— Kane County, Three Lakes, north of Kanab, I. Tidestrom 2417, 
July 9, r909 (B). 
MeExico.—No locality (probably Silver City, Grant County), 
E. L. Greene (FBb 3908, in part); Grant County, Ft. Bayard, Stephen’s 
