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The embryology of stegnospermataceae with a discussion on its status affinities and systematic position



The embryology of stegnospermataceae with a discussion on its status affinities and systematic position



Plant Systematics & Evolution 154(1-2): 139-145



The embryology of Stegnosperma halimifolium and S. watsonii has been studied in detail. The tapetum is of the secretory type and its cells become multinucleate. Simultaneous cytokinesis in the pollen mother cells follows meiosis. The ripe pollen grains are 3-celled. The ovule is crassinucellate, bitegmic and amphitropous, with the micropyle formed by the inner integument alone. The female archesporium is one celled, and the parietal tissue 3-5 layered. The embryo sac development conforms to the Polygonum type. A central strand, 6 or 7 cells thick, differentiates inside the nucellus and extends from the base of the embryo sac to the chalazal region. The endosperm is nuclear. The embryogeny conforms to the Caryophyllad type. The seed coat is formed by the outer epidermis of the outer integument and the inner epidermis of the inner integument. Based on this evidence and other data, the status of the genus as an independent family. Stegnospermataceae (Stegnospermaceae) is confirmed. Apparently, it forms a connecting link between Phytolaccaceae and Caryophyllaceae.

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