and Kyllingiella polyphylla (A.Rich.) Lye, which can have both trimerous
and dorsiventrally flattened dimerous pistils within a single spikelet (Haines & Lye, 1983; Larridon et al., 2011b).
Saxifragaceae, Asteraceae), or pentamerous flowers with a trimerous
In all four genera of Dasypogonaceae, flowers are trimerous
and pentacyclic, with six tepals in two alternating whorls, six stamens in two alternating whorls and a central gynoecium that is normally composed of three fused carpels located in the same floral sectors as the outer stamens and outer tepals.
(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.g.
They all have hermaphrodite, trimerous
flowers, with each subtended by a papery glume.
The question of paired staminodes is contradicted by a review study by Eklund (2000) of fossil Lauraceae flowe rs which demonstrates a basic and constant pattern of four trimerous
stamen whorls, the innermost being staminodial and with only the third bearing paired glandular appendages.
Burger (1977) hypothesized that trimerous
flowers (as in monocots) are derived from a fusing of three subunits, each of which resembles a chloranthoid flo wer.