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Based on extensive field work and investigations into all characters, the genus Glottiphyllum is revised. Sixteen species are recognized, their taxonomy and a cladogram are presented. Two nothogenera are mentioned, ×Gibbaeophyllum Rowley and × Delosphyllum Rowley. The position of the genus in the family is discussed, a possible evolutionary scenario within the genus is developed.
Of the four sections of Erepsia N.E.Br. (Liede, 1989), three have been published invalidly due to failure to indicate a nomenclatural type (Art. 37.1 ICBN 1988). Thus, indication of these types becomes necessary.
Six species of Caralluma have been found to occur in Oman: C. adenensis, C. “arabica”, C. flava, C. hexagona, C. penicillata and C. quadrangula, none being endemic to the country. The name C. aucheriana is considered obscure and its application should be discontinued. The application of the name C. arabica is uncertain. All except C. hexagona are illustrated with line drawings.
The entries on cacti in a publication which appeared only 5 months after the universally accepted starting-point for botanical nomenclature of 1 May 1753 are reproduced. At the XV International Botanical Congress, this work was placed on a list of works to be treated as though published before the starting point of botanical nomenclature, so that the authorship of generic names hitherto attributed to later authors remains unaffected.
Cheiridopsis N.E.Br., a southern African genus in the Aizoaceae Rudolfi, was recently revised by Hartmann and Dehn (1987). A number of lost species have subsequently been rediscovered; several new species, and forms linking some of the accepted species, have also been discovered. These are discussed and illustrated. Two species, C. delphinoides S.A.Hammer and C. velox S.A.Hammer, are newly described. Odontophorus N.E.Br., closely allied to Cheiridopsis, is also briefly examined. A new taxon, O. angustifolius L. Bolus subsp. protoparcoides S.A.Hammer, is described and illustrated.
Asbestos mining activities in the Bewaarkloof area, central-northern Transvaal, southern Africa, resulted in thousands of exposed tailings on slopes with varying gradients. Due to the potential health risk of asbestos fibre pollution, extensive reclamation and revegetation of the tailings were initiated in 1986. An assessment of a selection of apparently suitable plant species revealed that Euphorbia tirucalli L. is best suited as a reclamation pioneer in this area. The advantages of E. tirucalli for in situ reclamation purposes are presented and discussed.
Robert Lloyd Praeger's work on Crassulaceae (Aeonium, Aichryson, Monanthes, Sedum, Sempervivum) is outlined; he studied living and cultivated plants and did not collect and preserve herbarium specimens. The existence of some of the original drawings made from living plants by Miss Eileen Barnes for Praeger's publications is noted, and their significance as likely types is discussed. A new combination is published, Aichryson × aizoides (Lam.) E. C. Nelson, for the plant commonly named Aichryson × domesticum (Praeger) Praeger.