Androecium is epipetalous in this family.

Tetradynamous stamens are found in . . . . . . .

The presence of which structure makes the parachute mechanism for the dispersal of fruits and seeds common in plants of the family $Asteraceae$ (Compositae)?

In the Bentham and Hooker system of classification, the position of certain families like Ceratophyllaceae, Callitrichaceae, and Empetraceae is uncertain, and these unrelated families are placed in a group called "Ordines anomali". This group is included in:

Bicarpellary,syncarpous,unilocular ovary with basal placentation occurs in

Monocarpellary pistil with unilocular ovary and marginal placentation are found in