Page:Tree Crops; A Permanent Agriculture (1929).pdf/110

 their species would grow in our own arid wastes of the Southwest because I found with it identical species of cactus growing in New Mexico and Arizona."

Dr. Tower further writes, "As I recall conditions, the algaroba grows pretty generally in the dry fringe along the western and southern margins of the Pampas.

"To the best of my recollection, the algaroba is common at least as far south as latitude 40°, and at least as far north as latitude 30°.

"The trees are small; as I recall them, few were more than ten or twelve feet high, rather bushy, and pretty well protected with long sharp thorns. In the more northerly sections of its distribution, I think the size of the trees was rather larger than toward the south, where the growth was more in the nature of scrub than of what one commonly thinks of as real trees."