48 BOTANICAL GAZETTE [JULY 
In the lower part of the delta, where the river is affected by the spring 
tides, the cane is partly replaced by a cat-tail “‘tule” (Typha angusti- 
jolia), which not only lines the shores for many miles, but extends 
back somé distance on areas free from trees, forming dense masses 
Fic. 1.—Scene on right bank of Rio Colorado, Baja California, a few meters 
from the margin of the stream, 10k" below Yuma; the conchoidal fractures of the 
clayey mud are 30-35" in depth; Salix and Populus in background; Station 1 of 
hygrometric observations. 
that afford shelter for a number of animals, including a peculiar sub- 
species of a small mountain lion. 
Large areas throughout the delta which were not covered by trees 
bore wild hemp (Cassia?) in great abundance. The slender stems 
reach a height of 3-4™, branch profusely above, and bear numerous 
pods. At the time of our visit, the plants which were annuals were 
