Encyclopedia

  • Avonia albissima

    Curator reference for Avonia albissima, the widest-ranging of the papery-scaled Avonia, recorded from southern Angola through Namibia and the Richtersveld east to Griqualand West. Taxonomy and the Kew POWO disagreement, habitat, morphology, identification against A. papyracea, SANBI conservation status, and cultivation notes.

  • Avonia mallei

    Curator reference for Avonia mallei, the Northern Cape endemic of pegmatite and quartz hillsides known to science from three herbarium sheets. Taxonomy and the inverted basionym, the POWO disagreement, habitat, SANBI Rare status, CITES, and a winter-rainfall growing calendar derived from habitat rather than copied from the genus.

  • Avonia dinteri

    Curator reference for Avonia dinteri, the silver-scaled caudex plant of the Erongo and Otjozondjupa highlands of north-central Namibia. Taxonomy under two disagreeing authorities, habitat, the summer-rainfall growth calendar that separates it from its Karoo relatives, soil mix, Namibian legal protection and CITES Appendix II status.

  • Old Man Cactus

    Curator reference for the old man cactus, Cephalocereus senilis, the shaggy white-haired columnar cactus of Hidalgo and Veracruz, Mexico. Taxonomy, habitat, morphology, IUCN Endangered status, and how to tell it apart from the Andean look-alikes Espostoa lanata and Oreocereus celsianus.

  • Pseudolithos mccoyi

    La specie più recentemente descritta del genere (2001), Pseudolithos mccoyi cresce su calcare terziario lungo la costa del Dhofar in Oman e nello Yemen meridionale adiacente. Fusti quadrangolari liberamente ramificati formano piccoli gruppi simili a dita, diversi da qualsiasi altro membro del genere. Descritta in Asklepios 82 da Lavranos & Mies.