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DOCUMENTED CHROMOSOME NUMBERS 2005:2. COUNTS FROM WESTERN TEXAS, MOSTLY TRANS-PECOS CACTI

A. Michael Powell and James F. Weedin
SIDA, Contributions to Botany
Vol. 21, No. 3 (5 August 2005), pp. 1665-1668
Stable URL: http://www.jstor.org/stable/41968446
Page Count: 4
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DOCUMENTED CHROMOSOME NUMBERS 2005:2. COUNTS FROM WESTERN TEXAS, MOSTLY TRANS-PECOS CACTI
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Abstract

Sixty-four chromosome counts are reported for 27 taxa, mostly of western Texas, and most of them are opuntioid cacti (51 counts) of the Trans-Pecos region. Meiotic configurations suggest that Jeff Davis and Presidio county populations of O. davisii are triploid. Among the Opuntia reports are 11 diploid and two tetraploid counts attributed to O. macrocentra, and seven counts documenting a tetraploid taxon here referred to O. mackensenii var. minor. Three meiotic and two pollen stainability observations indicate that at least some plants of O. schottii var. schottii are partially or completely sterile. Se publican sesenta y cuatro recuentos cromosomáticos de 27 taxa, la mayoría del Oeste de Texas, y la mayoría de ellos son cactus opuntioides (51 recuentos) de la región de Trans-Pecos. Las configuraciones meioticas sugieren que las poblaciones de los condados de Jeff Davis y Presidio de O. davisii son triploides. Entre los recuentos de Opuntia 11 son diploides y dos tetraploides atribuidos a O. macrocentra, y siete recuentos que documentan un taxon tetraploide los referimos aquí a O. mackensenii var. minor. Tres observaciones meioticas y dos tinciones de polen indican que al menos algunas plantas de O. schottii var. schottii son parcial o completamente estériles.

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