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Title: Taxonomy and biodiversity of the genus Tylophora (Apocynaecease: Asclepiadoideae) in Malesia
Author: Schneidt, J.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1999
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The genus Tylophora (Asclepiadaceae: Astephaninae) is revised for Flora Malesiana. This revision is the first comprehensive taxonomic account of the genus that covers the whole Malesian region. A total of over 1500 herbarium specimens was systematically examined and 30 species and 8 varieties of Tylophora are recognised for Malesia, 26 of the species being endemic to the region. A key to species and varieties, species descriptions, habitat information, illustrations and distribution maps are provided. 11 species are described here for the first time: T. balgooyi, T. baliensis, T. coroniformis, T. erectiloba, T. grandis, T. koordersi, T. korthalsii, T. paluensis, T. schlechteri, T. unguiculata and T. winkleri. Three new combinations, 2 lectotypifications and 3 neotypifications, as well as several reductions, are proposed. The genus Tylophora in Malesia consists of slender twining herbs with small to medium sized flowers. The most important morphological characters for species identification and delimitation are shape and structure of the corona lobes, hairiness of the corolla, type of inflorescence, number of partial inflorescences and flowers per partial inflorescence, latex colour, and shape and size of fruits. Drying and pressing of the herbarium specimens often results in a distorted shape of the corona, thus complicating the identification and delimitation of species from herbarium material alone. Many misidentifications were found and flowers of almost every herbarium specimen had to be reconstituted for reliable results. The ultra structure of seed surfaces proved to be a very useful character for the grouping of related species. On the basis of morphological characters 3 species complexes are recognised: the T. cissoides species complex, T. flexuosa species complex and T. villosa species complex.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available