There are four plants in our islands which have nine as the normal number of stamens, and so form the Class Enneandria.
Structure and Habit.
Butomus . .
Rose flowers on tall, rushlike stalk. (Plate II).
Annual . .
Flowers green in tassels; stamens and pistils on separate plants.
Turns blue when dried.
Frog-bit . .
Flowers delicate, white, leaves kidney-shaped.