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ANATOMY OF ECHINODORUS (ALISMATACEAE) SCAPES FROM NORTHEASTERN BRAZIL AS APPLIED TO TAXONOMY

Published online by Cambridge University Press:  01 March 2008

L. Q. Matias ,
A. Soares  and
V. L. Scatena
L. Q. Matias*
Affiliation:
Universidade Federal do Ceará, Departamento de Biologia, Campus do PiCi, Bloco 906, 60451-760, Fortaleza, CE, Brazil.
A. Soares
Affiliation:
Universidade Federal do Ceará, Departamento de Biologia, Campus do PiCi, Bloco 906, 60451-760, Fortaleza, CE, Brazil.
V. L. Scatena
Affiliation:
Departamento de Botânica, Instituto de Biociências, UNESP, C. Postal 199, 13506-900, Rio Claro, SP, Brazil. Bolsista CNPq.
*
*E-mail for correspondence: lqmatias@ufc.br
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Abstract

The anatomical characters of the scape of Echinodorus glandulosus, E. lanceolatus, E. palaefolius, E. paniculatus, E. pubescens and E. subalatus subsp. subalatus (Alismataceae) were examined. These six sympatric species occur in northeastern Brazil and demonstrate great morphological similarity. The aim of the present study was to identify anatomical characters of taxonomic importance. Scapes possess a uniseriate epidermis composed of thin-walled tabular cells. The scapes of most species have differentiated epidermis, cortex, and vascular cylinders. There are several layers of regular chlorenchyma cells immediately below the epidermis, intercalated with collateral vascular bundles, in all species. There are also laticiferous ducts throughout the scape, and aerenchyma in both the cortex and pith. The shape and outline of scapes, the presence and position of winged extensions, the absence of differentiated vascular cylinders or cortex, and the number of vascular bundles are important characters for differentiating species in Echinodorus. An identification key employing the features analysed is provided.

Keywords

Alismataceaeaquatic plantsEchinodorusscape anatomy
Type
Articles
Information
Edinburgh Journal of Botany , Volume 65 , Issue 1 , March 2008 , pp. 11 - 21
Copyright
Copyright © Trustees of the Royal Botanic Garden Edinburgh 2008

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