- Diagram of the flower of Heath (Erica), a regular tetramerous flower.
34, 35), are a very large family, with "tetramerous" tarsi; there seem to be only four FIG.
A flower in which the parts are arranged in twos is called dimerous; when the parts of the whorls are three, four or five, the flower is trimerous, tetramerous or pentamerous, respectively.
Dimerous and tetramerous symmetry occur also among dicotyledons.
- Tetramerous monochlamydeous male flower of the Nettle (Urtica).
Thus, in axillary tetramerous flowers (fig.
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