| Abstrakt: |
The present paper deals with some aspects of floral morphology and embryology of U. stricticaulis. The inflorescence is a raceme. Flowers are large, bisexual, zygomorphic. Ovary is superior, bicarpellary, unilocular and contains numerous anatropous ovules on central massive placenta. The anther is tetralocular having 4-layered walls, with fibrillar endothesium and glandular tapetum. Microspores are tetrahedral and decussate. Pollen grains are tetraporate and 3-nucleate at the time of shedding. Ovules are unitegmal, tenuinucellar. A well-developed integumentary tapetum is restricted to the central part of the embryo-sac. A single hypodermal archesporial cell directly functions as the megaspore mother cell. The tetrad is linear and chalazal megaspore functions. Development of embryo-sac conforms to the Polygonum type. The endosperm is ab-initio cellular. The micropylar chamber formed after the first division of the primary endosperm nucleus gives rise to binucleate micropylar haustorium, from the chalazal chamber, the chalazal haustorium develops, which is also binucleate. The embryogeny follows the solanad type. [ABSTRACT FROM AUTHOR] |
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