Chromosome Numbers in Some Cacti of Western North America. IV.

Abstract
Documented meiotic and meiotic and mitotic chromosome numbers are reported for 51 taxa in 41 spp of 10 genera [Opuntia, Stenoureus, Echinocereus, Ferocactus, Neolloydia, Echinofossulocactus, Pediocactus, Coryphantha, Mammillaria, Echinocactus] of Cactaceae of southwestern United States and northern Mexico. Included are first counts for 21 taxa belonging to 18 spp. plus one interspecific triploid hybrid (Opuntia kleiniae .times. O. leptocaulis); and new counts for 4 previously reported species.

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