The genus Hydnora is confined to South Africa, Bourbon and Madagascar, and comprises several species, out of which three only occur in South Africa. They are all parasites, and the species which forms the subject of these notes, viz. Hydnora Africana, uses mainly the common milkbush of the karoo, Euphorbia mauritanica, L., as its host, and is of fairly common occurrence in South Africa (3). The flowers appear as buds on the underground stem, but

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