By Ulrich Meve
Dr ULRICH MEVE'S publication on Duvalia, one of many 30 genera comprising the crowd of stem-succulent Asclepiadaceae, is a bit of well-done study. The textual content is supported by way of very good illustrations comprising full-page drawings and photograph graphs making this monograph a really viable contribution for either profes sional and beginner botanists. Dr MEVE'S species delimitations are regularly in keeping with morphological, karyological and biogeographical reviews, and accordingly effortless to stick to. His taxonomic and well-established biogeographic conclusions were supported by way of box observations in southern and japanese Africa. surely, this booklet represents the best and so much 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 popular succulent vegetation 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 by means of a meticulousness standard of him. He has made himself a reputation among colleagues in addition to plant fans via his amazing variety of clinical and well known courses, which aren't limited to succulent Asclepiadaceae.
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Additional resources for The Genus Duvalia (Stapelieae): Stem-Succulents between the Cape and Arabia
Example text
Flavonoids Flavonoids are of limited occurrence in Asclepiadaceae; quality and quantity of flavonoid aglycons and glycosides is much lower in this family than in most others. Nevertheless, some information is scattered over the literature, proving a widespread content of luteolin (HEGNAUER 1989), quercetin and kaempferol (RAHMAN & WILCOCK 1991b, SUBRAMANIAN & NAIR 1968). In addition to the pure flower cyanidins investigated by KNAAK & al. (1969), stems and leaves have been studied. Duvalia stems analysed only possess traces of the flavonoid aglycons quercetin and luteolin.
When dormancy is definitely broken, the developing follicles grow continuously. The growth period is about 6-8 weeks. A maturing period follows, which takes about the same time or longer. On average, ca. 115 days pass between the onset of growth and dehiscence of the follicles (Fig. lIB). , in D. elegans, D. pubescens. The short growth period of D. pubescens may be an adaptation to the extremely arid habitats in southern Namibia. Water requirements as well as the risk of being eaten are minimized by short fruit-growing and -maturing periods.
Pollination is initiated when the flies, while probing or licking nectar, approach a guide rail entrance with their proboscis, so that hairs of the proboscis get caught in the guide rail. When the flies try to escape, the hairs are led upwards in the guide rails until they finally lodge in the cleft of the corpusculum, and thus release the whole pollinarium (Fig. 10F; for details see MEVE & LIEDE 1994). Breeding system Inter- and infrageneric hybrids of wild orIgm. Natural hybrids have been reported for D.