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).
macropetala have helicoiform actinomorphic
green corollas, spirally twisted petals, and the stamens are exposed.
Isolated flowers, presumably bisexual, actinomorphic
. Calyx unknown.
flowers were observed in a majority of the species (78.3%), and are associated with the most common floral types, such as tube and disk.
flowers of Lamiaceae or Fabaceae actinomorphic
descriptive term for flower symmetry, means radially symmetrical, e.g.
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.
The bowl shaped corolla is subsessile, pedicel 1-2 mm long; sepal 5, connate at the base, 5 to 10 x 2 to 4 mm; corolla 5, gamopetalous, actinomorphic
, isostemone, epipetalous stamens, alternate with the corolla lobes, ovary bicarpelar, superior, 1 to 2 ovules/locule.
Plant terrestrial or saxicolous, rosulate herbs, forming large colonies, flowering 0.80-1.6 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.