Abstract

Ruellia L., a pantropical genus with about 225 species, is the second largest genus in the Acanthaceae (Long 1970). Although centred in the New World tropics, it also has many representatives in the Old World. Studies of the genus Ruellia L. for the Flora of Ethiopia and Eritrea have resulted in the recognition of ten species in the Flora area, one of which is new to science. This is described below. Pollen size was measured after acetolysis (Erdtman 1960). Scanning electron micrographs are based on unacetolysed pollen material.

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