Cacti of Texas and Neighboring States

Cover

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Title Page, Copyright

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Contents

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Acknowledgments

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pp. vi-

Introduction

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pp. vii-viii

This is a field guide. Its purpose is to make possible the identification of the cacti growing in the five states covered. It therefore contains a distillation of the descriptive material from my previous book, Cacti of the Southwest, published by the University of Texas Press in...

What Is a Cactus?

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pp. 1-5

Before going directly into the description of the various cacti we might pause to consider, for those who have not concerned themselves about these things before, how a cactus differs from other plants, what is so special about it, and what are some of the...

Key to the Genera of the Cacti

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pp. 6-8

The keys which are given here and before the discussion of each major genus are based as far as possible on the vegetative characters of adult individuals, but it appears to be impossible to construct workable keys for the cacti based on these alone. It was found...

Genus Echinocereus

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pp. 9-78

The Echinocerei make up one of the largest genera of cacti, both in number of different species and in number of individuals found growing in the area of this study. Many of its members are collected and grown by cactus fanciers all over the world as great favorites...

Genus Wilcoxia

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pp. 79-81

The genus Wilcoxia was erected by Britton and Rose in 1909. Some earlier writers had included its members in Cereus and some in Echinocereus. Since 1909 the species in the genus have been dealt with in various ways. Berger placed them in the genus...

Genus Peniocereus

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pp. 82-84

Before Britton and Rose made this separation, the group had been part of the large genus Cereus. It is very hard to show significant characters to distinguish the genus Peniocereus from several other closely related genera. Perhaps its standing as a separate genus cannot...

Genus Acanthocereus

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pp. 85-87

Here is a small genus of somewhere around a dozen species carved out of the huge old genus Cereus. No one seems to dispute this one. Whether it is so little criticized because it is more of a natural group or because so little is certainly known about it is a question...

Genus Echinocactus

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pp. 88-136

Most of the cacti in the genus Echinocactus live up to the meaning of the name. Some of them present among the strongest, most rigid spines found on any cacti, and most of them are covered with as complete a spine cover as is found anywhere. Their main spines...

Genus Lophophora

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pp. 137-141

We come here to one of several cactus genera which seem to lie between the Echinocacti and the Mammillarias. Although there have been attempts in the past to submerge them in first one and then the other of these larger groups, they seem to defy either...

Genus Ariocarpus

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pp. 142-145

The body of an Ariocarpus consists of one or occasionally a cluster of low, flattened stems from only about 2 inches in diameter and not projecting above the soil level at all in some forms to as much as 10 inches across and 5 inches tall in one form. This stem sits on...

Genus Pediocactus

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pp. 146-151

The genus Pediocactus can be characterized as follows: the stems are either single or branching sparingly; flattened, spherical, or cylindrical; usually very small but in one form up to 6 inches in diameter and height. The surface of the stem is covered with small but...

Genus Epithelantha

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pp. 152-154

The whole stem of this cactus is covered with very many, very tiny tubercles- apparently the smallest tubercles of any U.S. cactus. Hiding these almost entirely from view are very many tiny spines. The growing tip of the stem is in the form of a rather distinct...

Genus Mammillaria

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pp. 155-227

The members of this genus are for the most part comparatively small or sometimes extremely tiny cacti. The plant stems vary in different species from depressed and almost flat to globular or sometimes even columnar in shape and are often referred to as...

Genus Opuntia

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pp. 228-340

Placed last in this account is the large genus Opuntia. Those who deal in matters of primitive versus advanced and theories of development tell us it should really be the first U.S. genus considered. The Opuntias are generally regarded as more primitive than the cacti...

Glossary

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pp. 341-345

Index of Scientific Names

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pp. 347-353

Index of Common Names

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pp. 354-356