Abstract
A taxonomic treatment of three species of Texas desert and desert-margin cacti,Echinocereus enneacanthus Engelm.,E. dubius (Engelm.) Rümpler, andE. stramineus (Engelm.) Rümpler, is presented. Field studies show thatE. enneacanthus is a grassland and desert-margin species rarely found above altitudes of 2000 ft in Texas, whileE. dubius andE. stramineus are desert-margin and desert species not found below 2000 ft. Morphological studies make possible the identification of these species on the basis of the shape, size, and arrangement of the spines. The epidermal characteristics are discussed, and the possibility of the use of the epidermal cell patterns as identifying characters is postulated. The speciesE. enneacanthus is divided into three forms based on spine characters and habitat.
Similar content being viewed by others
Literature Cited
Britton, N., &J. N. Rose. 1919-1923. The Cactaceae. 4 vol., Carnegie Inst. of Washington, Publ. 248. Wash., D. C.
Coulter, J. M. 1896. Preliminary revision of the North American species ofEchinocactus, Cereus, andOpuntia. Contr. U. S. Nat. Herb.3: 390.
Emory, Lt. Col. W. H. 1859. Report of the U. S. & Mex. Bound. Survey. Wash., D. C.
Engelmann, G. 1848. Botanical Appendix to “Memoir of a Tour to Northern Mexico in 1846 and 1847,” by A. Wislizenus, M. D. Printed by order of the U. S. Senate, 30th Congress, first session 1848. Misc. Doc. no. 26, pp. 87–115. Wash., D. C.
—. 1849. Cacteae of Plantae Fendlerianae. Mem. Amer. Acad.4: 49–53.
—. 1856. Synopsis of the Cactaceae of the Territory of the United States and adjacent regions. Proc. Am. Acad. Arts Sci.3: 259–314.
-. 1859. Cactaceae of the Boundary, from the report of the U. S. and Mex. Boundary Survey under the Order of Lt. Col. W. H. Emory, Maj. 1st Cav. and U. S. Commissioner. II. Part I, pp. 1–78, 75 Plates. Wash., D. C.
Ridgway, R. 1912. Color Standards and Color Nomenclatures. Publ. by the author. Wash., D. C.
Rümpler, T. 1886. Revision of Förster’s “Handbuch der Cacteenkunde,” 2nd. ed. Leipzig.
Wislizenus, A. 1848. Memoir of a Tour to Northern Mexico, Connected with Col. Doniphan’s Expedition in 1846 and 1847. Printed by order of U. S. Senate, 30th Congress, 1st session. Misc. Doc. no. 26, 141 pp. Wash., D. C.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Moore, W.O. The Echinocereus enneacanthus-dubius-stramineus complex (Cactaceae). Brittonia 19, 77–94 (1967). https://doi.org/10.2307/2805086
Issue Date:
DOI: https://doi.org/10.2307/2805086