Abstract
Summary: A re-evaluation of the two cliffdwelling mesembs, Esterhuysenia grahambeckii Van Jaarsv. and E. lucilleae Van Jaarsv. was considered necessary as a result of distinctive differences in vegetative, flower and capsule morphology and the genus Roosia is described accommodating the only two known species. Both are obligatory cliff dwelling species from sandstone cliffs (Cape Supergroup), R. grahambeckii from the Rooiberg between Robertson and Worcester and Roosia lucilleae from several sites on sheer cliffs along the southern slopes of the Hex River Mountains.
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