orthotropous


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orthotropous

(of the angiosperm ovule) having the MICROPYLE directed away from the placenta and erect on the FUNICLE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The fruits resemble those of Chloranthaceae in having a single pendent seed and a barrellike shape suggestive of ascidiate development, but the seed is anatropous, the most common type in angiosperms, rather than orthotropous as in Chloranthaceae.
Phylogenetic Analyses of Cretaceous Fossils Related to Chloranthaceae and their Evolutionary Implications
Unusual orthotropous germination in seeds of Cycas rumhii Miq.
Origin of the coleorhiza in cycad seedlings and its structural homology with that of the Poaceae
Ovule: (0) orthotropous, bitegmic; (1) anatropous or hemianatropous, bitegmic; (2) anatropous, unitegmic (Davis, 1966; Palkovic, 1974; Orchard, 1975; Corner, 1976; Cronquist, 1981; Dahlgren & Thorne, 1984; Webb & Gornall, 1989; Kubitzki, 1993b).
Systematics and leaf architecture of the Gunneraceae
The seed is orthotropous because the hilum, the chalaza, and the
Seed coat anatomy of Ceratozamia mexicana (Cycadales)
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