Browsing by Author "Linder, 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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    The questionable relationship of Montinia (Montiniaceae): evidence from a floral ontogenetic and anatomical study.
    (Botanical Society of America, 2000) Decraene, L; Linder, H; Smets, E
    The systematic position of Montiniaceae remains uncertain: a relationship with Cornales has been suggested on phytochemical and embryological evidence, while molecular data point to a relationship with Solanales. We investigated the floral development and anatomy of the South African Montinia caryophyllacea to add a new set of characters for clarifying the systematic position of the family Montiniaceae. Pistillate inflorescences show a higher degree of reduction than staminate, with flowers set terminally on short lateral branches. Flowers have an irregular initiation sequence, with frequent abortions of organs. In Montinia, petals grow rapidly, and no zonal growth takes place. The gynoecium develops as a pit surrounded by a girdle. Placentation is basically parietal and becomes axillary by the postgenital fusion of placental lobes; unitegmic ovules are arranged in two parallel rows with adjacent ovules partly overlapping each other. Unisexuality is respectively attained at the stage of anther development and carpel initiation. The floral anatomy of pistillate and staminate flowers is illustrated and discussed. Observations on Montinia are compared with data of taxa from Saxifragaceae sensu stricto, Cornales, and Solanales. The absence of sympetaly in Montinia is discussed. Morphological and anatomical evidence points to a high similarity with Escalloniaceae. Although a position in the asterids is most probable, there is little support for the relationship with Solanales indicated by molecular data.