By Ulrich Meve
Dr ULRICH MEVE'S ebook on Duvalia, one of many 30 genera comprising the gang of stem-succulent Asclepiadaceae, is a bit of well-done study. The textual content is supported through very good illustrations comprising full-page drawings and photograph graphs making this monograph a really conceivable contribution for either profes sional and novice botanists. Dr MEVE'S species delimitations are as a rule in line with morphological, karyological and biogeographical reports, and hence effortless to stick with. His taxonomic and well-established biogeographic conclusions were supported by means of box observations in southern and jap Africa. absolutely, this ebook represents the best and so much in depth monographs ever released for the Asclepiadaceae. The reports 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 professional Dr H. JACOBSEN and the karyologist Prof. G. REEsE. Dr MEVE has been concerned with Asclepiadaceae study for greater than ten years, and his paintings is characterised through a meticulousness usual of him. He has made himself a reputation among colleagues in addition to plant enthusiasts via his awesome variety of clinical and well known courses, which aren't limited to succulent Asclepiadaceae.
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Extra resources for The Genus Duvalia (Stapelieae): Stem-Succulents between the Cape and Arabia
Example text
Stapeliad seeds quickly germinate after moistening, normally within 2-10 days. Water imbibition is accomplished by the remainders of bundles of the suture (SYLLA 1986). After ca. 2 to 3 days the growing radicle breaks through the testa on the dorsal surface of the seed in the region between the seed body and the seed wing (Fig. 12K). Germination under partial rupture of the testa only takes place in this position close to the micropyle. The Fig. 12. Seeds and seedlings of Duvalia. A-I Seeds: A dorsal side, B seed with coma (D.
Immaculata UM 351 UM399 (+) + Sect. Arabica, 2n = 22 D. eilensis D. sulcata subsp. sulcata D. sulcata subsp. seminuda L24952 H21507 FN1373 (+) var. var. var. var. 20 flavonoid spectrum up to the complete loss of the capacity to synthesize flavonoids (KUBITZKI 1967, MABRY & al. 1970). Phylogenetic and biogeographic considerations "Polyploidy is a very conspicuous phenomenon in higher plants. Its study can reveal a great deal of information about the history of some groups, because polyploidisation is one of the few processes of evolution of which the direction can be determined without fossil evidence" (STEBBINS 1980).
Str. suggest also that the species once inhabited the whole area. During the Pliocene, about 10 million years ago, the Arabian Peninsula drifted off East Africa, opening up the Red Sea and splitting the area of D. sulcata. The nowadays isolated (to my knowledge) Sudanian habitats therefore need to be understood as relictual. KAssAs (1956) describes the locality of Erkovit in the Sudan as "Oasis", owing its status to special topography and geography (see above). The differentiation of D. sulcata subsp.