Abstract
Five species are here recognized in Wellstedia: W. socotrana on Socotra, W. somalensis sp. nov. and W. laciniata sp. nov. in Somalia, W. filtuensis in Ethiopia, and W. dinteri in Namibia and the adjacent Cape Province. A preliminary phylogenetic analysis suggests that W. dinteri is the sister group to the rest of the genus, while W. filtuensis, W. somalensis and W. socotrana are vicarious sister species. Wellstedia has usually been treated either as a separate subfamily within the Boraginaceae or as a family of its own close to Boraginaceae. Its most notable feature is the capsular fruits (here shown to be hygrochastic), capsules otherwise being unknown in Boraginaceae. It is suggested that the nearest relative of Wellstedia may be Tiquilia in Boraginaceae subfamily Ehretioideae.
Résumé
Cinq espèces ont été reconnues au sein du genre Wellstedia: W. socotrana au Socotra, W. somalensis sp. nov. et W. laciniata sp. nov. en Somalie, W. filtuensis en Ethiopie et W. dinteri en Namibie et dans la Province du Cap qui lui est adjacente. Une première analyse phylogénétique laisse apparaître que W. dinteri est le groupe “soeur” vis-à-vis du reste du genre, tandis que W. filtuensis, W. somalensis et W. socotrana sont des espèces “soeurs” vicariantes. Wellstedia a été généralement traité soit comme sous-famille séparée au sein des Boraginaceae, soit comme famille à part voisine des Boraginaceae. Sa caractéristique la plus notable est la présence de fruits capsulaires (il est démontré ici qu’ils sont hygrochastiques), alors que l’existence de capsules n’est pas connue par ailleurs chez les Boraginaceae. Il semblerait que le genre le plus voisin de Wellstedia soit Tiquilia dans la sous-famille des Ehretioideae des Boraginaceae.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Balfour, I.B., 1884. Diagnoses plantarum novarum phanerogamarum socotrensium. Proc. Roy. Soc. Edinb. 12: 402–411.
Balfour, I.B., 1888. Botany of Socotra. Trans. Roy. Soc. Edinb. 31.
Constance, L. & T.I. Chuang, 1982. SEM survey of pollen morphology and classification in Hydrophyllaceae (Waterleaf family). Amer. J. Bot. 69: 40–53.
Cronquist, A., 1981. An integrated system of classification of flowering plants. Columbia University Press, New York.
Dostál, J., 1957. Botanicka nomenklatura. Prague.
Emberger, L., 1960. Les vegetaux vasculaires 2. Paris.
Erdtman, G., 1952. Pollen morphology and plant taxonomy. Stockholm.
Farris, J.S., 1988. Hennig86, ver. 1. 5. Reference. New York, published by the author.
Gilg, E., 1924. Syllabus der Pflanzenfamilien, ed. 9 & 10. Berlin.
Giirke, M., 1897. Borraginaceae. In A. Engler & K. Prantl (eds.), Giirke, M. 3a. Leipzig.
Holmgren, P.K., N.H. Holmgren & L.C. Barnett, 1990. Index Herbariorum, Part 1, The herbaria of the world, ed. 8. Regn. Veg. 120.
Hunt, D.R., 1969. Wellstedia socotrana, W. dinteri var. dinteri, W. dinteri var. gracilior. Hook. Ic. Pl. 37: tab. 3665–3667.
Hunt, D.R. & J.P. Lebrun, 1975. A new Wellstedia ( Boraginaceae) from Ethiopia. Kew Bull. 30: 222.
Lemée, A.M.V., 1935. Dictionnaire descriptif de genres de plantes phanérogames 6. Paris.
Melchior, H., 1964. Syllabus der Pflanzenfamilien, ed. 12. Berlin.
Merxmüller, H., 1960. Wellstediaceae. Mitt. Bot. Staatss. München 3: 619–622.
Novák, F.A., 1943. Wellstediaceae. Prát, Rostlinopis 9: 530.
Pijl, L. van der, 1972. Principles of dispersal in higher plants. Berlin.
Pilger, R., 1912. Die Gattung Wellstedia in Südwestafrika. Bot. Jahrb. Syst. 46: 558–561.
Pilger, R. & K. Krause, 1914. Nachträge IV zu IV. 3a. In: A. Engler & K. Prantl (eds.), Die natürlichen Pflanzenfamilien. Leipzig.
Takhtajan, A., 1987. Sistema magnoliofitov. Moskva.
Thulin, M., 1987. A new species of Xylocalyx (Scrophulariaceae) from Somalia. Nord. J. Bot. 7: 267–269.
Thulin, M., 1994. Aspects of disjunct distribution and endemism in the arid parts of the Horn of Africa, particularly Somalia. Proc. XIIIth AETFAT Congress, Zomba.
Ulbrich, E., 1928. Biologie der Früchte und Samen. Berlin.
White, F., 1983. The vegetation of Africa. Natural Resources Research 20. UNESCO, Paris.
Zohary, M. 1962. Plant life of Palestine. The Ronald Press Company, New York.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 Kluwer Academic Publishers
About this chapter
Cite this chapter
Thulin, M., Johansson, A.N.B. (1996). Taxonomy and biogeography of the anomalous genus Wellstedia . In: van der Maesen, L.J.G., van der Burgt, X.M., van Medenbach de Rooy, J.M. (eds) The Biodiversity of African Plants. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0285-5_11
Download citation
DOI: https://doi.org/10.1007/978-94-009-0285-5_11
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6613-6
Online ISBN: 978-94-009-0285-5
eBook Packages: Springer Book Archive