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Ovary Structure and Placentation in the Tribe Pauridiantheae (Rubiaceae)
Bulletin du Jardin botanique National de Belgique / Bulletin van de Nationale Plantentuin van België
Vol. 62, No. 1/4 (Sep. 30, 1993), pp. 419-428
Stable URL: http://www.jstor.org/stable/3668288
Page Count: 10
You can always find the topics here!Topics: Ovaries, Septum, Placenta, Taxa, Ovules, Carpels, Placentation, Vascular bundles, Genera, Gynoecium
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A detailed morphological-anatomical account of the ovary structure and placentation in the tribe Pauridiantheae is given using a bicarpellate taxon, Pauridiantha paucinervis subsp. lyallii, and a tetracarpellate species, Stelechantha ziamaeana, as examples. The presence of false septa (in addition to "true" septa) is characteristic for the entire tribe. They represent inward projections produced by the ovary wall which are only developed in the upper half of an ovary (thus seemingly doubling the number of locules present). The false septa are in contact with the "true" septum (or septa) only in the uppermost part of the ovary; lower down they gradually retreat and, from around mid-ovary, they are no longer discernible. The placentas, on which always many to very many ovules are borne, differ between bi- and more-carpellate taxa of the Pauridiantheae in their size, shape and orientation. It is noted that in the tetracarpellate Stelechantha ziamaeana the placentation is apparently quite similar to that described for the Urophylleae in that each locule has two placenta arms which are at least in part attached to the septa. In bicarpellate Pauridiantha, the placenta is a peltate, more or less heart-shaped structure.
Bulletin du Jardin botanique National de Belgique / Bulletin van de Nationale Plantentuin van België © 1993 Botanic Garden Meise