Abstract
The species currently known as A. involucratum, and previously known only from the type collection made by Carl Thunberg in the 1770s, was rediscovered on the Roggeveld escarpment, Cape Province, South Africa. Until now the distribution of the species was unknown because this information was not given in Thunberg''s (1800) protologue of Psoralea involucratum, the basionym. The species has many attributes unusual in Argyrolobium, but characteristic of the related Crotarioid genus Melolobium, and this species may belong in the latter genus.

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