(335) 
3. CLEISTOYUCCA. Josuua Tree. 
I. CLEISTOYUCCA ARBORESCENS (Torr.) Trelease, Rep. Mo. Bot. 
rd. 13: 41. 
Yucca draconis arborescens Torr. Pacif. R. Rep. 4: 147. 1857. 
Yucca brevifolia Engelm. King Exped. 5: 496. 1871. Not 
Schott. 1859. 
Yucca aiboreccent Trelease, Rep. Mo. Bot. Gard. 3: 163. 
1892 
92. 
Type locality: “Sandy and gravelly plains west of the Colorado, 
California.” 
Distribution: Mohave Desert of southern California east and 
north to southern Nevada, northeastern Arizona, and southwestern 
Utah. It forms orchard-like groves between the juniper and Co- 
villea belts. Lower Sonoran. 
Specimens examined: Desert slopes of the Tehachapi Moun- 
tains, near Willow Springs, Abrams &F McGregor 430. 
4. YUCCA. Yucca. 
1. YUCCA MOHAVENSIS Sargent, Gard. & For. 9: 104. 1896. 
Type locality: “Most abundant and grows to its largest size 
on the Mohave Desert.” 
Distribution: Northwestern Arizona and southwestern Nevada 
westward through the Mohave Desert and southward along the 
western border of the Colorado Desert to northern Lower Cali- 
fornia, where it extends westward into the coastal region in the 
vicinity of San Diego. This species is said to have been collected 
by Parry near Monterey, but we strongly suspect that this is an 
error through confusion of labels. Parry’s plants in all probability 
came from San Diego, for so far as we are aware the plant has not 
been found in the coastal region north of this locality. 
Specimens examined: San Dieguito (Bernardo), Abrams 3409; 
San Diego, Jones 3163; San Timotea Canyon, Hall 5751; western 
base of Mount Santa Rosa, Hall 1905. 
SALICACEAE. Witiow Famity. 
Stamens numerous, bracts fimbriate or lacerate. 1. Populus. 
Stamens 1-5; bracts entire or denticulate. 2. Salix. 
