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ONTOGENY OF THE FRUITS OF TWO ANOMALOUS AFRICAN WOODY GENERA, POLEMANNIOPSIS AND STEGANOTAENIA (APIACEAE), AND THEIR PHYLOGENETIC RELATIONSHIP

Published online by Cambridge University Press:  13 April 2004

M. (REBECCA) LIU ,
B-E. VAN WYK  and
P. M. TILNEY
M. (REBECCA) LIU
Affiliation:
Department of Botany, Rand Afrikaans University, PO Box 524, Auckland Park, Johannesburg 2006, Republic of South Africa
B-E. VAN WYK
Affiliation:
Department of Botany, Rand Afrikaans University, PO Box 524, Auckland Park, Johannesburg 2006, Republic of South Africa
P. M. TILNEY
Affiliation:
Department of Botany, Rand Afrikaans University, PO Box 524, Auckland Park, Johannesburg 2006, Republic of South Africa
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Abstract

The fruits of two anomalous African woody Apiaceae, Polemanniopsis marlothii and Steganotaenia araliacea, differ in structure when mature though the ovaries are very similar, both being heteromorphic in young flower stage. This unexpected heteromorphism in S. araliacea has important implications for future studies of basal genera and the interpretation of fruit characters in general. Both taxa also have unique ‘intrajugal cavities’ in the ovaries and fruits, which supports the idea that the two genera are closely related, sharing some characters with the Hydrocotyloideae and Saniculoideae. This provides morphological and anatomical evidence to support the previous hypotheses on their relationship with Saniculoideae. Their basal position is also supported by characters shared with other basal genera previously included in Hydrocotyloideae, such as the lateral wings and slightly lignified endocarp in Polemanniopsis and Steganotaenia.

Keywords

AnatomyfruitontogenyPolemanniopsisSteganotaeniaUmbelliferae
Type
Research Article
Information
Edinburgh Journal of Botany , Volume 60 , Issue 3 , November 2003 , pp. 249 - 257
Copyright
© 2003, Trustees of the Royal Botanic Garden, Edinburgh

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