showing that the ovules are bitegmic, the inner integument has no vascular bundles, and the seeds are exotegmic.
The seed originates from anatropous, bitegmic, crassinucellate ovule.
Microdiptera (in the broadest sense) is morphologically and anatomically similar to Decodon, sharing the following characteristics: anatropous ovules, bitegmic
seeds with inner lignified layers typical of the Lythraceae, a germination valve on one side of the seed, and extensive spongy tissue through which the raphe runs from near the hilum to the chalaza.
Furthermore, most tenuinucellate dicotyledons are also unitegmic, as Dablgren (1975) noted, whereas the majority of "primitive" dicotyledons and monocotyledons have bitegmic ovules (Endress, 1990, 1994; Dahlgren & Clifford, 1982).
The plesiomorphic conditions in monocotyledons are generally considered to be bitegmic and crassinucellate (e.