Alford, Mac , Dold, Anthony .
Wood anatomy of Gerrardinaceae and its relevance to the circumscription of Huerteales.
Gerrardinaceae are a family of two species of shrubs or small trees native to southern and eastern Africa. Formerly placed in the heterogeneous and polyphyletic family Flacourtiaceae, recent analyses based on DNA sequence data have indicated that Gerrardinaceae are closely related to Dipentodontaceae (Dipentodon and Perrottetia) and Tapisciaceae (Tapiscia and Huertea). These taxa have been placed together in the order Huerteales, which is sister to Brassicales plus Malvales. Unfortunately, Huerteales are poorly known, but some of the few hypothesized uniting features of the group are from wood anatomy. Unlike other malvids, Huerteales generally have scalariform vessel perforation plates and septate fibers and lack axial parenchyma in the wood. Wood anatomy has been studied in Dipentodon, Huertea, Perrottetia, and Tapiscia, but not in Gerrardina. A study of Gerrardina foliosa reveals presence of scalariform perforation plates and lack of axial parenchyma, as predicted.
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1 - University of Southern Mississippi, Department of Biological Sciences, 118 College Drive #5018, Hattiesburg, MS, 39406, U.S.A.
2 - Rhodes University, Selmar Schonland Herbarium (GRA), Somerset Street, Grahamstown, Eastern Cape Province, 6139, South Africa
Presentation Type: Oral Paper:Papers for Sections
Location: 556B/Convention Center
Date: Wednesday, August 4th, 2010
Time: 2:00 PM