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Chromosome Numbers in Chihuahuan Desert Cactaceae. Trans-Pecos Texas

1978; Wiley; Volume: 65; Issue: 5 Linguagem: Inglês

10.2307/2442586

1537-2197

James F. Weedin, A. Michael Powell,

Archaeology and Natural History

American Journal of BotanyVolume 65, Issue 5 p. 531-537 Article CHROMOSOME NUMBERS IN CHIHUAHUAN DESERT CACTACEAE. TRANS-PECOS TEXAS James F. Weedin, James F. Weedin Chihuahuan Desert Research Institute and Department of Biology, Sul Ross State University, Alpine, Texas, 79830Search for more papers by this authorA. Michael Powell, A. Michael Powell Chihuahuan Desert Research Institute and Department of Biology, Sul Ross State University, Alpine, Texas, 79830Search for more papers by this author James F. Weedin, James F. Weedin Chihuahuan Desert Research Institute and Department of Biology, Sul Ross State University, Alpine, Texas, 79830Search for more papers by this authorA. Michael Powell, A. Michael Powell Chihuahuan Desert Research Institute and Department of Biology, Sul Ross State University, Alpine, Texas, 79830Search for more papers by this author First published: 01 May 1978 https://doi.org/10.1002/j.1537-2197.1978.tb06104.xCitations: 13AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Chromosome numbers are presented for 100 collections of Cactaceae from the Trans-Pecos region of Texas. A total of 65 taxa representing 52 species and 12 genera were counted, including first reports for 45 taxa and new ploidy levels for four taxa. Notable among those listed are counts for Opuntia schottii var. grahamii (n = 11, ca. 22), O. stanlyi (n = 22), O. arenaria (n = 11), O. phaeacantha var. spinosibacca (n = 22), O. lindheimeri var. lindheimeri (n = 11), O. strigil (n = 11), Echinocereus enneacanthus var. cf. dubius (n = ca. 22), E. pectinatus var. neomexicanus (n = 22), and Thelocactus bicolor var. bicolor (n = 22). Endomitosis was found to be present in O. phaeacantha var. spinosibacca, Mammillaria pottsii, and Neolloydia intertexta var. dasyacantha. Meiotic irregularities were noted in some species belonging to the genera Opuntia and Echinocereus. Phytogeographic considerations are inferred from the chromosomal data for O. polyacantha, O. lindheimeri, and O. ficusindica. A base number of x = 11 in Cactaceae is supported. Citing Literature Volume65, Issue5May-June 1978Pages 531-537 RelatedInformation