Development of Floral Organs of the Soy Bean

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Abstract
The mature flower of Soja max consists of a calyx tube with 5 unequal lobes, 5 distinct petals, 10 stamens (9 united and 1 free), and 1 carpel. Both unicellular and multicellular trichomes are found on the calyx and pistil. The flower primordium appears first as a protuberance in the axil of a bract. The order of emergence of the floral organs is sepals, petals, outer cycle of stamens, inner cycle of stamens, pistil. The order of emergence within each cycle is from the anterior to the posterior side of the receptacle. Development of the petals is slow at first, but later becomes rapid. The stamens are free at first; later 9 become united leaving 1 of the inner cycle free. The 1-4 campylotro-pous ovules develop simultaneously, and the micropylar end is directed toward the distal end of the ovary.

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