Abstract

SummaryCtenium bennae Xanthos is described and illustrated as the only rheophytic species in the genus. The new species is known from a single waterfall on the Benna Plateau, at the border between Forecariah and Kindia Prefectures in Guinea Conakry. Ctenium bennae is here assessed as Near Threatened according to the categories and criteria of IUCN.

Highlights

  • The genus Ctenium Panz. (Chloridoideae: Cynodonteae) comprises c. 20 species, all occurring in the tropics and subtropics (Longhi-Wagner & Cope 2014)

  • Its distribution straddles between Africa, Madagascar and the Neotropics, neither continent has any species in common, which makes it of particular interest to phytogeographers (Longhi-Wagner & Cope 2014)

  • An updated revision on the African species was published by Longhi-Wagner & Cope (2014) who formally recognised eight species

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Summary

Introduction

The genus Ctenium Panz. (Chloridoideae: Cynodonteae) comprises c. 20 species, all occurring in the tropics and subtropics (Longhi-Wagner & Cope 2014). The first synopsis of Ctenium was by Smith (1896) who only revised the American taxa and recognised eight species This number has risen to fourteen (LonghiWagner 2005) with an updated revision of the American species currently in preparation An updated revision on the African species was published by Longhi-Wagner & Cope (2014) who formally recognised eight species. Konomou 657 is unique in Ctenium in its combination of the two lowermost florets being completely reduced to awns, and the fourth floret absent. It represents the only known rheophytic species of Ctenium. Konomou 657 represents the only fertile collection to date and the plant is described below as new

Materials and Methods
Third floret Fourth floret Habitat
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