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Geophytes diverging in rivers—a study on the genus Crinum, with two new rheophytic taxa from Cameroon

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Abstract:

Most species of the genus Crinum (Amaryllidaceae) are bulbous geophytes and grow in areas with strong seasonality. A few have abandoned their geophytic habit and grow inundated in rivers and possess leaves without stomata and seeds without buoyancy. Traditionally the genus has been divided into sections, based on flowers being star-shaped or bell-shaped. Analysis of DNA sequences of ITS and trnL-trnF regions has resolved a new clade of star-shaped Crinum species: the Crinum natans clade of West Africa. From the rain forest of Cameroon two new river taxa are described: Crinum amphibium Bjorå & Nordal sp. nov. and Crinum natans Baker subsp. inundatum Kwembeya & Nordal subsp. nov. A key to the Crinum species of Cameroon is provided. The new name Crinum exile Bjorå & Nordal nom. nov. is proposed for Crinum humile A. Chev. (1950) non Herb. (1826).

Keywords: AMARYLLIDACEAE; CRINUM; GEOPHYTE; ITS; PHYLOGENY; TRNL-TRNF

Document Type: Research Article

Affiliations: 1: Botanical Garden, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway;, Email: charlotte.bjora@nhm.uio.no 2: National Botanical Research Institute, P. Bag 13184, Windhoek, Namibia 3: Botanischer Garten, Menzinger Str. 63, 80638 München, Germany 4: University of Oslo, Department of Biology, P.O. Box 1066, Blindern, 0316 Oslo, Norway

Publication date: 2009-05-01

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