Journal Vol 78-4

July - August 2006

 

Contents

  • Succulent and Xeromorphic Bromeliads of Brazil : Part 3: Encholorium maximum, Orthophytum bule-marxii & Dyckia goehringii  PIERRE J BRAUN & EDDIE ESTEVES PEREIRA
  • Home Grown : Cactus tips from a master gardener, part 2ELTON ROBERTS
  • Book Review : Stapeliads of Southern Africa and Madagascar by Peter V Bruyns DYLAN HANNON AND STEVEN HAMMER
  • Echinocereus coccineus variety rosei in Doña Ana County, New Mexico ROOT GORELICK
  • A rare ring form of Herrera's Barrel Cactus, Ferocactus herrerae DAVID YETMAN
  • Rhytidocaulon arachnoideum  A unique new species from the Horn of Africa TOM A MCCOY
  • Coryphantha dasyacantha found in New Mexico and the cacti at Anthony Gap ROOT GORELICK
  • Ice Plants on skis PANAYOTI KELAIDIS
  • Succulents on Stamps : Cereus, Part 2 PEG SPAETE
  • Aloe pronkii a most remarkable dwarf species from the Malagasy highlands JOHN J LAVRANOS, PROFESSOR BAKOLIMALALA RAKOUTH & TOM A MCCKOY

 

On the cover: Rhytidocaulon arachnoideum, newly described in this issue, is unusual in many ways. Members of the genus Rytidocaulon are strange and wonderful mimicry plants easily passed over as dead, so wrinkled and cryptically colored are their succulent stems. Nevertheless, local people often consume them as a fresh, vegetable snack!  Being a member of the milkweed family, pollinators (like tiny flies) are lured into a highly complex and efficient pollination ritual similar to what happens in orchids: an entire packet of pollen, called a pollinium, is surreptitiously latched onto a tiny hair of the pollinator's leg or body and then (hopefully) delivered to the next flower.  Meanwhile the fly has been duped into searching for a pleace to lay its eggs -- and gets nothing for its trouble. The flowers on this species are unique in having a delicate webbing that stretches from one petal (lobe) to the next -- like a spider's web -- lending the species its name.  The function of the webbing is unclear, but once this plant is established in our collections it can be studied, an perhaps its purpos will be revealed.  Photo by Tom McCoy.

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