By Ulrich Meve
Dr ULRICH MEVE'S booklet on Duvalia, one of many 30 genera comprising the crowd of stem-succulent Asclepiadaceae, is a section of well-done examine. The textual content is supported through very good illustrations comprising full-page drawings and photograph graphs making this monograph a truly plausible contribution for either profes sional and novice botanists. Dr MEVE'S species delimitations are more often than not in line with morphological, karyological and biogeographical stories, and hence effortless to stick with. His taxonomic and well-established biogeographic conclusions were supported by way of box observations in southern and japanese Africa. absolutely, this booklet represents the most effective and such a lot extensive monographs ever released for the Asclepiadaceae. The experiences of Dr MEVE have been initiated at my former chair of systematic botany in Kiel, the previous paintings position of the well known succulent crops expert Dr H. JACOBSEN and the karyologist Prof. G. REEsE. Dr MEVE has been concerned with Asclepiadaceae examine for greater than ten years, and his paintings is characterised by way of a meticulousness ordinary of him. He has made himself a reputation among colleagues in addition to plant enthusiasts via his amazing variety of medical and well known guides, which aren't limited to succulent Asclepiadaceae.
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Extra info for The Genus Duvalia (Stapelieae): Stem-Succulents between the Cape and Arabia
Duvalia sect. Arabica. The vegetative plant body differs scarcely in sect. Arabica, but is distinctly different from the South Africa species. , Orbea. Despite their separation from their South African relatives, however, none of the Arabian species has developed a real floral novelty. Floral structure thus is extremely conservative and almost independent of habitat influences, and should be given higher weight in phylogenetic considerations here. However, this interpretation of vegetative and floral character sets in the stapeliads needs careful assessment for each genus under consideration, because in other genera the opposite situation is more likely.
Duvalia. Both show low morphological variability. Presumably they originated from hybrids between diand tetraploid parental species with subsequent doubling of the then triploid chromosome set. This autoallopolyploid origin (cf. STACE 1989) runs parallel to a phenotypical stabilisation. Chromosome morphology. 9 flm in length (Fig. 14). , Giemsa C-banding, SCHWARZACHER & al. 1980). Apart from technical problems, this method has been shown to be of little benefit in the stapeliads because of the lack of assessable variation in the stainable Breeding system 33 heterochromatic bands of the chromosomes (ALBERS 1983).
Seminuda with D. caespitosa var. compacta. Restricted crossability points to a long independent and divergent development of both groups. Duvalia eilensis proved to be completely isolated gametophytically within sect. Arabica. Duvalia sulcata and D. velutina can be crossed relatively easily (see above). Isolation mechanisms. M e c han i c a lis 0 I at ion m e c han ism s. In the field, mechanical incompatibilities may serve as successful prezygotic isolation mechanisms. Pellucid margins of the pollinia and guide rails often do not fit together due to different sizes.