Browsing by Author "Kurzweil, H"

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    The phylogeny and classification of the Diseae (Orchidoideae:orchidaceae).
    (Missouri Botanical Garden Press, 1994) Linder, H; Kurzweil, H
    The subtribal classification of the Diseae (Orchidoideae) is reviewed in light of the available morphological, leaf anatomical, and palynological data. These data are critically assessed, and the more prominent features are illustrated. The data are analyzed cladistically, and the robustness of the various components of the most parsimonious tree is assessed by a bootstrap analysis. Based on the cladistic analysis and the bootstrap analysis, a new classification is proposed for the Diseae. The results of the bootstrap analysis are used to establish the nodes at which formal taxa should be recognized. This classification recognizes five monophyletic subtribes: the Satyriinae, Disinae, Brownleeinae (a new subtribe), Huttonaeinae, and Coryciinae. It is suggested that Brownleea, the only genus of the Brownleeinae, may be of hybrid origin, as it shares the autapomorphies of the Disinae and Coryciinae. Huttonaea is shown to be more closely related to the Diseae than to the Orchideae, and is consequently included as a subtribe of the Diseae. The new classification is formally presented, and a key to the genera is provided.
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    Studies in the genus Machairophyllum (Mesenbryanthemacae), with notes on some related genera
    (AOSIS, 2003) Kurzweil, H; Chesselet, P
    Machairvphllum Schwantes is a small genus of the family Mesembry anthemaceae. confined to the southern part of central South Africa from the Little Karoo at Barrydale in the west to the Zuurberg near Kirkwood in the east. Machairophyllum is unusual in the Mesembryanthemaceae-Ruschioideae in that fynbos and renosterveld are the preferred habitats. The morphology, anatomy as well as the pollen, seed and leaf epidermis ultrastructure of the genus were examined. The taxonomy of Machairophyllum is rev ised on the basis of data presented. Of the ten names originally described, only four are upheld. M. alhidum (L.) Schwantes, M. stayneri L.Bolus. M. bijliae (N.E.Br.) L.Bolus and M. brevifolium L.Bolus. All four species are very similar in their vegetative habit, and differ mainly in inflorescence and flower characters. Several presumably related genera. Bijlia N.E.Br.. Carruanthus (Schwantes) Schwantes and Cerochlamys N.E.Br.. are briefly discussed.