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An appraisal of the molecular systematics of Sapindaceae, in the light of wood anatomical distribution pattern of the family
  • VIGI GEORGE M,
  • N Hari
VIGI GEORGE M
CMS College
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N Hari
CMS College

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Abstract

This paper reviews the molecular classification of Sapindaceae, by collating the existing wood anatomical details of each tribe. The comparison is restricted to how much the wood anatomical distribution is supported or conflicts with the current subfamilial and tribal shifting of the genera, from their traditional placement in Radlkofer's classification. The presence of simple vessel perforations, alternate vessel wall pitting, and vessel-ray and vessel-parenchyma pits similar in size, shape, and arrangement to the inter vessel pits, and fibers of the libriform type with simple to minutely bordered pits in both Aceraceae and Hippocastanceae clades strongly support their embedding under Sapindaceae. The present analysis also confirms the placement of the Delavaya group as the basal clade under Sapindoideae, the retrieval of Conchopetalum to the Dodonaeoideae subfamily, and the definition of Hippocastanoideae as a temperate subfamily. The wood anatomical similarity of the Dodonaeoideae genera with the other three subfamilies points towards the polyphyly of the Dodonaeoideae subfamily and is comparable with the polyphyly concept of Radlkofer. The current circumscription of Tinopsis and Neotina under Tina is also agreed by their homogenous Cupania type wood anatomy. The systematic affinities of the traditional Schleichereae and Cupanieae tribe are also revealed in their Cupania type wood anatomy. Albeit the wood anatomy agrees with the wider circumscription of Sapindaceae, the wood anatomy details for the majority of the tribes go in line with that of the traditional Radlkofer's concept.