merism (0) trimerous, (1) dimerous, (2) polymerous.
If the androecium
matures before the gynoecium and produces pollens in a hermaphrodite flower, this called protandry (Percival, 1965).
All morphological traits, such as shape, color and texture of perianth, androecium
, and gynoecium, were described as the flowers were being measured.
1 a, b), 2-forked dichasia to 1 x 1 cm, axillary to the distal most leaves, flowers with calyx, corolla and androecium
pentamerous or tetramerous (Figs.
6 cm de diam., asymmetric; sepals green, oblong or orbicular to ovate, abaxial surface pilose, 7.5-8.5 X 4-6 mm; petals yellow, two external, oblong to ovate, 16-31 X 9-26 mm, two internal, oblong to obovate, 14-30 X 9-19 mm, cuculus orbicular, bent around the androecium
and gynoecium, 17-25 X 11-20 mm; stamens yellow to vinaceous, 8-18 mm long; staminoids yellow, 4-5 mm long; ovary yellow, setulose, 16-28 mm long; style green, 3-5 mm long.
Collectively, stamens form androecium
. RNA-Seq analysis was carried out for the 5 developmental stages of stamen revealed; two genes AcSBP4 and AcSBP6 were highly expressed at the first developmental stage of stamen.
is composed of 7 equal stamens, bilocular and dehiscence inwards or terminal.
Dipterocarpoid floral visitors, Dipterocarpus excepted, are pollen robbers: The geography and phylogeny of the distinctive dipterocarpoid androecium
, its anthers of generically distinct form and usually with diverse connectival appendages, are fundamental to understanding dipterocarp pollination biology and breeding systems, provide the primary basis for generic diagnosis, and thereby give insight into pollinator co-evolution as the subfamily met new opportunities; yet they receive no mention.
Female flowers in date palm (Phoenix dactylifera L.) possess tricarpellary apocarpous pistil consisting of three independent carpels, while rudimentary androecium
is represented by two whorls of three staminodes each alternately arranged in antepetalous and antesepalous position (DeMason et al., 1982).
Receptacle glabrous between androecium
The flowers are composed of 6 blue lilac tepals, persistent tepals fused along half their length into a perianth tube; the androecium
consist of six stamens inserts at different levels, with long-, mid- and short-styled morphs (hereafter referred to as the L, M and S morphs, respectively), and a yellow mark or nectar guide on the upper middle lobe.
consists of four stamens, two long (1.5-2.0 mm) and two short (1.0-1.5 mm) and the gynoecium has superior ovary, multicarpelar and a long style (1.5-2.0 mm) with bifid stigma.