South Afncan Journal of BotaflY 2001 67 230-234 Copyngitt O NISC Ply LId Pntlled In Soullt AfnCD - All rights res erved SOUTH AfRICANJOORNAL OF BOTANY ISSN 0254-6299 A new species of Rhoicissus (Vitaceae) from Sekhukhuneland, South Africa 11r l 2 E Retief , SJ Siebert and AE van Wyk , Nationat Herbarium, National Botanical Institute, Private Bag X101, Pre toria 0001, South Africa , HGWJ Schweickerdt Herbarium, Department of Botany, University of Pretoria , Pretoria 0002, South Africa • Corresponding author. e-mail:
[email protected]. za Received 5 January 2000, accepted in revised fo rm 30 June 2000 Rhoicissus sekhukhuniensis Retief, Siebert & A .E.van from which it can be distinguished by trifoliolate leaves Wyk, a rare new species from South Africa, is described, with coarsely toothed margins. Pollen grains are tricol illustrated and compared with other members of the po rate with a reticulate tectum. R. sekhukhuniensis is genus. It is a scandent shrub, rarely a robust climber, endemic to the Sekhukhuneland region, a centre of the young growth with a dense indumentum of reddish plant endemism associated with ultramafic rocks (main brown hairs. The species is closely related to the sim ly norite, anorthosite and pyroxenite) of the Eastern ple-leaved R. tomentosa (Lam,) Wild & RB,Drumm" Bushvetd Igneous Comptex, Introduction Rhoicissus comprises about 11 described species in south with midrib and principal lateral veins prominently raised, ern Africa and is presently under revision. The purpose of margins coarsely and bluntly toothed , densely fringed with th is contribution is to describe a distinct new member of the hairs; terminal leaflet obovate.