trimorphous

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trimorphous

[trī′mȯr·fəs]
(biology)
Characterized by occurring in three distinct forms, as an organ or whole organism.
References in periodicals archive ?
In her model, modifiers that increase the strength of heteromorphic incompatibility spread, though perhaps not to fixation, before floral trimorphism becomes established.
These difficulties make it hard to determine the precise points of particular evolutionary shifts, but the following broad conclusions can be drawn: (1) tristyly broke down to homostyly on multiple occasions within the family; (2) instances of enantiostyly in Monochoria and Heteranthera are not homologous; (3) there was probably one, but perhaps also a second, origin of tristyly; and (4) heteromorphic incompatibility arose after the origin of floral trimorphism.
Our survey of French populations revealed unexpectedly high levels of trimorphism in small populations.
What is perhaps more remarkable is the stability of floral trimorphism in the face of these ecological pressures.