Abstract
In a survey of the pteridophytes of Botswana, the family Isoetaceae was encountered and is a new record for Botswana. The family is represented by a single species, Isoetes schwein- furthii. Also recorded for first time in Botswana were three other species: Ophioglossum lancifol- ium, Actinopteris dimorpha, and Marsilea minuta. Although the pteridophytes of southern Africa have been thoroughly and very capably surveyed (Schelpe, 1970; Jacobsen, 1983; Schelpe and Anthony 1986; Burrows, 1990), new explorations are adding to knowledge regarding their specific ranges. Botswana is a semi-arid country situated in the south- central part of the African continent and has three major ecological regions (Parson, 1993). In the northern region there are the Okavango Delta and the ancient lake beds of the Makgadikgali Pans. The southern area comprises the Kalahari Desert, characterized by fossil sand dunes and scrub and bush savan- na. Between the Okavango-Makgadikgali and the Kalahari Desert, is an inter- mediate ecological zone known as the Hardveld region, dominated by sandy soils.
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