Revision of the African genus Crotonogyne (Euphorbiaceae)
cover of volume 151 issue 3
PDF

Keywords

Crotonogyne
Euphorbiaceae
new species
tropical Africa
Guineo-Congolian Region
taxonomy

How to Cite

Breteler, F. (2018) “Revision of the African genus Crotonogyne (Euphorbiaceae)”, Plant Ecology and Evolution, 151(3), pp. 352-379. doi: 10.5091/plecevo.2018.1445.

Abstract

Background and aims – The African genus Crotonogyne is revised for the first time since 1912. Identification of new material collected since proved to be very difficult. The revision serves also as a basis for the treatment of the genus in the Flore du Gabon.
Methods – Normal practices of herbarium taxonomy have been applied to study the relevant herbarium material available, mainly from BM, BR, BRLU, HBG, K, MA, P, and WAG. The relevant collecting data are stored in the Naturalis Biodiversity Center, Leiden, Section Botany. MAPMAKER was used to produce the distribution maps.
Key results – Eleven species are recognised including two new species: Crotonogyne micrantha from Cameroon and C. neglecta from Nigeria, Cameroon, and Equatorial Guinea (Rio Muni). Crotonogyne manniana subsp. congolensis is raised to specific rank. All species, except for C. congolensis with one collection from Angola, are confined tot the Guineo-Congolian region. A full taxonomic treatment with key to the species is given. Male and female flowers of most species are depicted. The distributions of the species are mapped. The flowers are unisexual, but it is not clear whether the species are monoecious or dioecious. Crotonogyne poggei and C. impedita are neotypified and C. angustifolia, C. gabunensis, C. lasiocarpa, C. ledermanniana, C. manniana, C. preussii, C. strigosa, and C. zenkeri are lectotypified.

https://doi.org/10.5091/plecevo.2018.1445
PDF

References

Baillon H. (1891) Observations sur quelques nouveaux types du Congo. Bulletin Mensuel de la Societé Linéenne de Paris 2: 872 & 953–954.

Beille L. (1917) Euphorbiaceae. In: Chevalier A. (ed.) Novitates Florae Africanae. Bulletin de la Société Botanique de France 61, Mémoire 8: 295.

Brown N.E. (1905) In: Stapf O. Contributions to the Flora of Liberia. Journal of the Linnean Society, Botany 37: 79–114. https://doi.org/10.1111/j.1095-8339.1905.tb00826.x

De Wildeman E. (1908) Études de systématique et de géographie botaniques sur la flore du Bas- et du Moyen-Congo. Annales du Musée du Congo, Botanique, série V, vol. II: 278.

De Wildeman E. (1910) Compagnie du Kasai. Mission permanente d’études scientifiques. Bruxelles, Imprimerie A. Lesigne. https://doi.org/10.5962/bhl.title.147877

De Wildeman E. (1911) Études sur la Flore des Districts des Bangala et de l’Ubangi (Congo Belge). Plantae Thonnerianae Congolensis, série II: 226, PL. X. Bruxelles, Misch & Thron, Libraires-Éditeurs.

De Wildeman E. (1914) Neue Arten aus Zentral-Afrika (Belgisch- Kongo) I. Repertorium Specierum Novarum Regni Vegetabilis XIII, 370/371: 369–384. https://doi.org/10.1002/fedr.19140132402

Govaerts R., Frodin D.G., Radcliffe-Smith A. (2000) World checklist and bibliography of Euphorbiaceae (and Pandaceae). Kew, Royal Botanic Gardens.

Hawthorne W., Jongkind C. (2006) Woody plants of Western African forests; a guide to the forest trees, shrubs and lianes from Senegal to Ghana. Kew, Kew Publishing.

Keay R.W.J. (1955) Revision of the Flora of West Tropical Africa VII. Kew Bulletin 10: 137–141. https://doi.org/10.2307/4113932

Keay R.W.J. (1958) Euphorbiaceae. In: Hutchinson J., Dalziel J.M. (eds) Flora of West Tropical Africa, 2nd Ed. 1(2): 364–423. London, Crown Agents for Oversea Governments and Administrations.

Léonard J. (1955) Notulae Systematicae VIII. Euphorbiaceae Africanae Novae. Bulletin du Jardin botanique de l’État à Bruxelles 25: 283–301. https://doi.org/10.2307/3667027

Léonard J. (1962) Flore du Congo et Ruanda-Burundi VIII(1): Spermatophytes. Bruxelles, Institut National pour l’Étude Agronomique du Congo.

Müller Argoviensis J. (1864) Neue Euphorbiaceen des herbariums Hooker in Kew, auszugweise vorläufig mitgeteilt aus dem Manuscript für De Candolle’s Prodromus. Flora 47: 529–540.

Pax F. (1894) Euphorbiaceae Africanae II. Botanische Jahrbücher für Systematiek, Pflanzengeschichte und Pflanzengeographie 19: 76–127.

Pax F. (1897) Euphorbiaceae Africanae III. Botanische Jahrbücher für Systematiek, Pflanzengeschichte und Pflanzengeographie 23: 518–536.

Pax F. (1899) Euphorbiaceae Africanae IV. Botanische Jahrbücher für Systematiek, Pflanzengeschichte und Pflanzengeographie 26: 325–329.

Pax F. (1903) Euphorbiaceae Africanae VI. Botanische Jahrbücher für Systematiek, Pflanzengeschichte und Pflanzengeographie 33: 276-291.

Pax F. & Hoffmann K. (1912) Crotonogyne und Neomanniophyton. In: Engler A. (ed.) Das Pflanzenreich, Heft 52. IV 147 VI (Euphorbiaceae-Acalypheae-Chrozophorinae): 111–120. Leipzig, Wilhelm Engelmann.

Pax F. (1914) In: Engler A. (ed) Das Pflanzenreich. Additamentum V: 427. Leipzig, Wilhelm Engelmann.

Pax F. (1921) Euphorbiaceae. In: Engler A., Drude O. (eds) Die Vegetation der Erde IX. Engler A. Die Pflanzenwelt Afrikas III. 2. Leipzig, Wilhelm Engelmann.

Pax F. & Hoffmann K. (1931) Crotonogyne In: Engler A., Prantl K. (eds) Die natürlichen Pflanzenfamilien, 2nd Ed. 19c. Leipzig, Wilhelm Engelmann.

Prain D. (1911) In: Diagnoses Africanae XLII. Bulletin of Miscellaneous Information, Kew 1911: 232. https://doi.org/10.2307/4118394

Prain D. (1911) In: Diagnoses Africanae XLIII. Bulletin of Miscellaneous Information, Kew 1911: 262–267. https://doi.org/10.2307/4114990

Prain D. (1912a) In: Diagnoses Africanae XLVI. Bulletin of Miscellaneous Information, Kew 1912: 102. https://doi.org/10.2307/4104542

Prain D. (1912b) In: Diagnoses Africanae XLVII. Bulletin of Miscellaneous Information, Kew 1912: 191. https://doi.org/10.2307/4104530

Prain D. (1912c) Crotonogyne. In: Hutchinson J. (ed.) Euphorbiaceae. Flora of Tropical Africa VI(1): 819–826.

Prain D. (1913) Crotonogyne. In: Hutchinson J. (ed.) Euphorbiaceae, Addenda. Flora of Tropical Africa VI(1): 1054.

Radcliffe-Smith A. (2001) Genera Euphorbiacearum. Kew, Royal Botanic Gardens.

Thiers B. (continuously updated) Index Herbariorum, a global directory of public herbaria and associated staff. New New York Botanical Garden’s Virtual Herbarium. New York (online). Available from http://sweetgum.nybg.org/science/ih/ [accessed 25 jan. 2017].

Webster G.L. (1975) Conspectus of a new classification of the Euphorbiaceae. Taxon 24(5/6): 593–601.

Webster G.L. (1994) Synopsis of the genera and suprageneric taxa of Euphorbiaceae. Annals of the Missouri Botanical Garden 81: 33–144. https://doi.org/10.2307/2399909

White F. (1979) The Guineo-Congolian Region and its relationship to other phytochoria. Bulletin du Jardin botanique National de Belgique 49: 11–55. https://doi.org/10.2307/3667815

For material published before 1 January 2019, all rights are reserved. Copyright holders are Meise Botanic Garden and the Royal Botanical Society of Belgium. Permission to use this material must always be obtained from the Editor in chief, via the Editorial Office.

For further information on access, permissions and re-use of papers published in Plant Ecology and Evolution, please read our Open Access policy.