Ovule and Seed Structure in Argemone aurantiaca (Papaveraceae)

Ovule ontogeny and seed anatomy-morphology in Argemone aurantiaca G. B. Ownbey were investigated. Ovule primordia are dizonate. The inner integument is initiated before the outer integument. The mature ovule is anatropous, bitegmic, and crassinucellate Megasporogenesis and megagametogenesis follow a Polygonum-type of development. Antipodals are enlarged and persistent At maturity the tegmen is composed of one cell layer and the testa is composed of three cell layers The mature seed is covered by a thick cuticle. Endosperm is initially free-nuclear, but becomes cellular with numerous oil globules. The linear embryo produces two cotyledons.