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52 Phytologia (Aug 2004) 86(2) SUBFAMILIES OF CACTACEAE JUSS., INCLUDING BLOSSFELDIOIDEAE SUBFAM. NOV. Bonnie S. Crozier Section of Integrative Biology, School of Biological Sciences University of Texas, Austin, Texas 78713, U.S.A. ABSTRACT New data from chloroplast DNA comparisons reveal Blossfeldia Werd. (Cactaceae) as an isolated lineage between a basal grade of subfamilies Opuntioideae-Pereskioideae-Maihuenioideae and a more derived sister pair of clades, making recognition of a new subfamily warranted. Based on parsimony and Bayesian cladistic analyses of chloroplast DNA sequences reported elsewhere, as well as morphological distinctiveness, Blossfeldioideae Crozier subfam. nov. is erected and Rhipsalidoideae Burnett is resurrected. An abbreviated history of suprageneric classification in the family and a key to the six subfamilies of Cactaceae recognized here is provided. KEY WORDS: Blossfeldia, Blossfeldioideae, Maihuenioideae, Opuntioideae, Pereskioideae, Rhipsalidoideae, Cactaceae. As in many other families of flowering plants, there has been little unanimity in the suprageneric classification of the Cactaceae Juss. but slowly the discovery of new taxa, careful morphological observation, and other contributions to phylogenetic knowledge have led to refinements. The Cactaceae (Cacti) of Jussieu ( 1 789) encompassed all the known cacti of the time under the single genus Cactus L., but also included Ribes L. (Grossulariaceae). Apparently aware of studies by de Candolle (1828) and Lindley (1830) that excluded Grossulariaceae from Cactaceae, Eaton (1836) nonetheless chose to divide Jusssieu's Cactaceae into two subfamilies, distinguishing Cactoideae (Cacteae) from Grossularieae. The Grossulariaceae were not included in Burnett's (1835) concept

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Subfamilies of Cactaceae Juss., including Blossfeldioideae subfam. nov

B S Crozier
Phytologia 86: 52-64 (2004)

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