Abstract
Two new species of Colombian mistletoes are described and illustrated that provide transitions between the previously isolated, monotypic genus Ixocactus and the genus Cladocolea. This linkage necessitates a reformulation of generic boundaries. Of the several options, the one that is preferable involves the placement of both new species in the former genus as I. gracilis sp. nov., and I. rhynchophyllus sp. nov., and the transfer of three Cladocolea species to Ixocactus as I. clandestinus comb. nov., I. inconspicuus comb. nov., and I. inornus comb. nov. This redefinition of the genus is based most conspicuously on the absence of inflorescences, unique in small-flowered neotropical Loranthaceae. An amended generic diagnosis and key to the six species are provided
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