Morphologic, field, and chromosomal studies of Opuntia series Clavatae including the three major taxa, O. schottii, O. grahamii, and a series of populations from Texas originally described as a ...
THE issue of the fourth volume of “The Cactaceæ” brings this sumptuous monograph of the family to a conclusion. Previous volumes have been discussed in NATURE, vol. 107, p. 580, and vol. in, p. 426.
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