Ovule Ontogeny and Its Relation to Seed-Coat Structure in some Species of Polygala (Polygalaceae)
- 1 September 1980
- journal article
- research article
- Published by University of Chicago Press in Botanical Gazette
- Vol. 141 (3) , 277-282
- https://doi.org/10.1086/337156
Abstract
The ovule primordia of Polygala [P. vulgaris L., P. myrtifolia L., P. chamaebuxus L. and P. vayredae Costa] are trizonate. The inner integument is 2 layered and of dermal origin. The outer integument can be 2 to multilayered. The changeover from a subdermally initiated outer integument to a mainly dermal outer integument is clearly demonstrated. In P. chamaebuxus, the outer integument is mainly of subdermal origin; in P. vulgaris, the subdermal contribution to the outer integument is delayed and restricted to the antiraphal side. The differences in ontogeny are reflected in the seed-coat structure. The exostome aril arises from the dermal apex of the outer integument and is completely of dermal origin.This publication has 1 reference indexed in Scilit:
- Studies in the Floral Anatomy of Polygala (Polygalaceae)American Journal of Botany, 1976