VOL. 1v.] Trees of Southern California. 347 
Fls. June. Bear Valley; San Jacinto Mountains; San Antonio 
Mountain. 
Alnus rhombifolia Nutt. Parry, Bull. Cal. Acad. ii, 351. 
4. oblongifolia Torr. Slender tree, 50 feet high, the trunk 2 feet 
in diameter. Fils. January. Abundant along streams from 3000 
feet altitude on the southern slope of the San Bernardino Range 
to the Coast. San Jacinto Mountains; Cuyamaca Mountains. 
Santa Monica, asse. 
Salix nigral. Fort Mojave, the station noted for this willow 
in the Botany of California, is in Arizona, but it may be expected 
on the Californian side of the Colorado. Mr. Bebb informs me 
that there is in his herbarium.a specimen of the subvar. venu/osa 
Anders., a pubescent form of the var. /omgzpes, Anders., collected 
by Dr. J. T. Rothrock at Elizabeth Lake, No. 187, Survey of 
the tooth Meridian. I have been able to find no other evidence 
of the existence of this tree within our limits. 
Salix levigata Bebb. ‘‘ Black Willow.’’ The largest of the 
Southern California willows, 25 feet high, the trunk 18 inches in 
diameter, or infrequently shrubby. Fls. April. By streams or 
in meadows; common from 2000 feet altitude on the southern 
slope of the San Bernardino Range to the Coast, and on Santa 
Catalina Island. 
Salix lasiandra Benth., var. /ancifolia Bebb. Rarely a small 
tree, 20 feet high, the trunk to inches in diameter; usually 
reduced toashrub. Fis. May. Situation and continental range 
of the last species. 
Salix longifolia Muhl. Reduced toa shrub. Sandy banksof 
streams, away from the water. Borders of the Colorado Desert, 
at Agua Caliente (Palm Springs), also at Lytle Creek near San 
Bernardino. This wide-spread species probably has a more 
extended range in this region than here indicated, but material 
and records are wanting for its definition. It is with difficulty 
distinguished from some forms of S. sessz/ifolia Nutt., a very 
‘common and very variable willow of the region. 
Salix flavescens Nutt. Reduced to an arborescent shrub, 
12 feet high. Fils. June. Stream banks in the San Bernardino 
Mountains at from 7000 to 8000 feet altitude. 
