Seed morphology in Neobuxbaumia (Cactaceae)

  • Gabriel Arroyo-Cosultchi Programa de Botánica, Colegio de Postgraduados, Montecillo
  • Teresa Terrazas Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México
  • Salvador Arias Jardín Botánico, Instituto de Biología, Universidad Nacional Autónoma de México
  • Lauro López-Mata Programa de Botánica, Colegio de Postgraduados, Montecillo
Keywords: Cactaceae, keel, North America, Pachycereinae, scanning electronic microscopy, similarity, testa

Abstract

Seed 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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Seed morphology in Neobuxbaumia (Cactaceae)
Published
2007-12-15
How to Cite
Arroyo-Cosultchi, G., Terrazas, T., Arias, S., & López-Mata, L. (2007). Seed morphology in Neobuxbaumia (Cactaceae). Botanical Sciences, (81), 17 - 25. https://doi.org/10.17129/botsci.1762
Section
STRUCTURAL BOTANY / BOTÁNICA ESTRUCTURAL