Accession #: 199700061
Accession Date: 1997-09-18
Common name: Tree Tumbo
Family: Welwitschiaceae
Synonym(s): <i>Welwitschia bainesii</i> (Hook.f.) Carrière
Country of Origin: Namib Desert
Description: A single species of dioecious perennial with short stem and taproot native to S. Angola and SW African deserts, extending into mopane woodland. It is a long-lived plant, deriving moisture from sea-fog dew. Winged seeds germinate in wet years, the cotyledons photosynthesizing for 1.5 years; foliage leaves decussate with respect to cotyledons, of indefinite growth (up to 13.8 cm per year), wearing away at the tips, the apical meristem being lost. Fertile buds are produced on the 'crown' between the leaf bases.
Cone-bearing shoots dichasial, insect pollinated. Females subtended by cone-scales making up a red cone and consisting of a single nucellus enclosed in an integument and another layer derived from two confluent primordia ('perianth') with 2 'bracts'; megaspore mother-cell grows into a prothallus without archegonia. Male microsporangia subtended by cone-scalesmaking up a red cone and consisting of 2 lateral 'bracts' and a 'perianth' formed by the union of 2 bract-like organs, 6 microsporangiophores and a sterile unitegmic ovule; male gametophyte merely a tube-nucleus, an abortive sterile cell and a cell giving rise to 2 sperm nuclei. As pollen tubes penetrate prothallus, prothallial tubes grow up to meet them in the nucellus, fusion of females and males allegedly occurring in the tubes; many zygotes but only one matures and is dispersed with 'perianth' as a wing.
Uses:
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USDA Zone: 9-11
Source: Seed - UC-Davis, Univ of Colo. - Boulder
Provenance:
Restrictions:
Culture:
Difficult to cultivate requiring desert conditons and room to accomodate its long taproot. Propagated by seeds. <p> An excellent article by Anna Senters can be found <A HREF="http://florawww.eeb.uconn.edu/reference/welwitschia_mirabilis01.htm"><b>here</b></A>