actinomorphic


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actinomorphic

(of regular flowers) divisible into two or more planes to give identical halves. In animals such a structure is described as radially symmetrical (see RADIAL SYMMETRY).
References in periodicals archive ?
Many studies have proposed that actinomorphic flowers are primitive and zygomorphy evolved from an actinomorphic ancestor under selection to increase pollination accuracy (Sargent, 2004; Gong & Huang, 2009).
4 cm wide, imbricate but the rachis visible after anthesis, smooth to nervate, ecarinate, glabrous outside, sparsely brown punctulate-lepidote inside, apex rounded; flowers distichous, ascendent, 13-22 per spike, actinomorphic, corolla helicoiform, subsessile; sepals free, green, oblanceolate, 3-3.
5) Schmidt (1935) formally proposed the subfamilies Asaroideae for the members with actinomorphic flowers (Asarum, Saruma, and Thottea), and Aristolochioideae for the members with a monosymmetric perianth (Aristolochia, Euglypha, and Holostylis).
Flowers are actinomorphic and five sided, with two whorls of four to six anthers borne on slender filaments (Eckert and Barrett 1994c).
Each flower is characterized by an actinomorphic, pentamerous perianth composed of a whorl of sepals and a whorl of petals, a haplostemonous androecium with antesepalous stamens, and a bicarpellate gynoecium; the styles of the flowers are fused to free, and the single stigma is capitate.
6 m tall, the rosettes actinomorphic to slightly zygomorphic in mature plants, 40-80 cm diameter.
The white to pink flowers are actinomorphic, hermaphroditic, and slightly protandrous.
Flowers of this species are atypical of heterostylous species in being nontubular and actinomorphic, with the long- and mid-level organs projecting well beyond the hypanthium.
Isolation and sequence analysis of two CYC-like genes, SiCYCIA and SiCACIB, from zygomorphic and actinomorphic cultivars of Saintpaulia ionantha (Gesneriaceae).
1985) and Kubitzki (1987), we consider cyperoid flowers to be derived from a typical trimerous, actinomorphic, diplostemonous, monocot flower with a superior syncarpous pistil (e.
He pointed out, however, that several genera of Mutisieae differ in having actinomorphic or ligulate corollas and ecaudate anthers (the last feature in some genera of Barnadesiinae).