Seed morphology in Neobuxbaumia (Cactaceae)
AbstractSeed morphology of nine species of Neobuxbaumia and Carnegiea gigantea was examined by scanning electronic microscopy to distinguish their similarities and differences. Fourteen quantitative and qualitative features were evaluated to identify groups of species using a phenetic analysis. Two groups were recognized based on seed shape and rim position relative to the hilum-micropylar region. Neobuxbaumia species are characterized by the following features: large to extremely large, glossy, smooth seeds, with periphery keeled, border slightly expanded around hilum, hilum-micropylar region oblique, superficial, and hilum-micropyle complex oval. Neobuxbaumia multiareolata has obvious interstices and N. laui possesses convexities with high domes. Carnegiea gigantea differs from Neobuxbaumia species in that its seeds are ovoid, with border highly expanded around hilum, hilum-micropylar region superficial, and hilum-micropyle complex key-shaped. Most seed characters described are shared with member of Pachycereinae, and thus no single seed character can be recognized as a synapomorphy for Neobuxbaumia.
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