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The systematic significance of seed morphology and anatomy in the portulacaceae centrospermae



The systematic significance of seed morphology and anatomy in the portulacaceae centrospermae



Folia Geobotanica et Phytotaxonomica 23(3): 275-279



The seeds of 115 species in eighteen genera of the family Portulacaceae were examined with the scanning electron microscope. Longitudinal sections of seeds of representatives of all the genera were examined with the light microscope. Two broad groups based on shape of the seeds, ornamentation of the external surface of their testa, and the position of the embryo relative to the endosperm were recognised. The first group comprising three genera : Anacampseros L., Grakamia GILLIES and Talinopsis A. GRAY, have seeds which are pyriform with wings and trichomes, and an embryo that is more or less parallel to the endosperm, while the second of fifteen genera: Calandrinia H.B.K., Calyptridium NUTTALL, Calyptrotheca GILG, Ceraria PEARSON et STEPHENS, Claytonia L., Lenzia PHILIPPI, Lewisia PURSH, Lyallia HOOKER fil., Montia L., Portulaca L., Portulacaria JACQUIN, Silvaea PHILIPPI, Talinella BAILLON, Talinum ADANSON, and Wangerinia FRANZ, are reniform without wings and with an embryo that is horse-shoe shaped around the endosperm.

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Accession: 007939371

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DOI: 10.1007/bf02854820


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