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A Second Species of the Amphi-Atlantic Genus Alonsoa (Scrophulariaceae) in South Africa

Kim E. Steiner
Annals of the Missouri Botanical Garden
Vol. 76, No. 4 (1989), pp. 1152-1159
DOI: 10.2307/2399701
Stable URL: http://www.jstor.org/stable/2399701
Page Count: 8
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A Second Species of the Amphi-Atlantic Genus Alonsoa (Scrophulariaceae) in South Africa
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Abstract

A second species of the predominantly South American genus Alonsoa has been found to occur in South Africa, having been incorrectly classified previously as Diascia unilabiata (Linn. f.) Benth. Its correct combination in Alonsoa already exists and is here resurrected, along with a full description and synonymy. Alonsoa unilabiata differs from South American species in having oil-secreting trichomes in shallow corolla sacs and from the other South African species in its annual habit, dilated filaments, and acuminate, bilobed stigma. Flowers of Alonsoa unilabiata are self-compatible, but are usually out-crossed by Rediviva (Melittidae) oil-collecting bees. Differences between Alonsoa and Diascia are discussed.

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