unitegmic

[‚yü·nə′teg·mik]

(botany)

Referring to an ovule having a single integument.

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References in periodicals archive ?

Seeds originate from anatropous, unitegmic and tenuinucellate ovules (Figure 1A).

Seed characters and their usefulness in the separation of Asteraceae species/Caracteres de sementes e sua utilidade na separacao de especies de Asteraceae

He further pointed out that the remaining significant morphological difference--number of ovule integuments--putatively justifying a separation between Itea (bitegmic) and Choristylis (previously reported as unitegmic) is based on a misinterpretation of the number of ovule integuments in Choristylis (Kubitzki, 2007a).

A review of the fossil record of the genus Itea (Iteaceae, Saxifragales) with comments on its historical biogeography

The ovule is of anatropous type and unitegmic (Fig.

Male and Female Gametophyte Development in Cichorium intybus

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.

Rescuing Robert Brown--the origins of angio-ovuly in seed cones of conifers

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 ovules of cycads are unitegmic (Chamberlain, 1935; Singh &

Seed coat anatomy of Ceratozamia mexicana (Cycadales)

Ovary (2-)4-5(-14) carpellate, superior to inferior, with usually axile to intruded parietal placentation, rarely apical or basal; ovules 1 to many per carpel, anatropous to nearly campylotropous, unitegmic, tenuinucellate, the embryo sac usually of the Polygonum type; style short to long, hollow, sometimes expanded apically; stigma truncate to capitate or slightly to strongly lobed, sometimes cup shaped, funnel shaped, or flabellate to pinnatifid.

Phylogenetic classification of Ericaceae: molecular and morphological evidence

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 nucellus and chalaza in monocotyledons: structure and schematics

Ovules 1 to many in each locule, anatropous to hemitropous, or amphitropous; unitegmic, simple, tenuinucellar or pseudocrassinucellar (in Asclepiadaceae), usually without an integumentary tapeturn; endosperm development usually nuclear, rarely cellular.

A consensus classification for the order Gentianales with additional details on the suborder Apocynineae