anatropous


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Related to anatropous: anatropous ovule

anatropous

(of flowering plants) having the OVULE inverted so that the MICROPYLE points towards the PLACENTA.
References in periodicals archive ?
alata are anatropous, subglobose, bitegmic, and crassinucellate, with a narrow conical nucellus (see Figure 4D, E).
75 mm, anatropous, with a tuberculed, hexagonal-celled exotesta.
The anatropous ovule, a characteristic not previously reported for the genus Syagrus had already been reported for other genera of the Tribe Cocoseae, with Attalea and Cocos (Uhl and Moore, 1971; Guevara and Jauregui, 2008).
The fossil and living taxa share the following characters: persistent floral tube, valvate sepals (unknown in Minsterocarpum), superior ovary, axile placentation, capsular fruit, loculicidal dehiscence (unknown in fossil Decodon), septum attached to outer wall of the valve at dehiscence, multiple anatropous seeds per locule, and a t obtrigonal shaped seed body with a sclerotic inner lining of the seed coat.
The ovary is monocarpellate and the mature ovule is anatropous, bitegmic and crassinucellate.
Gymnosperm ovules are always unitegmic and also orthotropous so that the podocarp ovule may be seen as anticipating the anatropous ovule of flowering plants, the second integument being responsible for the necessary asymmetric growth.
In contrast, Abolbodoideae (Abolboda, Aratitiyopea, and Orectanthe) have bifacial leaves, spherical pollen without an evident aperture, novel glands on the gynoecium, anatropous ovules, and spherical seeds (Dahlgren et al.