Page:Memoir of a tour to northern Mexico.djvu/104

[ 26 ] A. sanguinea. These, together with a low scrubby oak tree, with small perennial leaves, were the only trees collected about Cosihuiriachi. A species of Juniperus, with red berries, a Thuja, and a small-leaved Cowania(?) all of them in fruit, were also brought from there.

Between Chihuahua and Cosihuiriachi, but especially about the latter place, the porphyritic soil produced a number of Cactaceae, some strange Echinocacti, several Mammillariae, a few Opuntiae, and principally a great variety of Echinocerei. One of the latter is completely covered with stout and long spines; another has short radiating spines, closely adpressed to the plant; a third has short radiating spines, with single, stout black central ones, which project from the plant in all directions; a fourth is distinguished by its longer and curved reddish radiating spines, with a stouter one projecting from their centre. I have all of these in