There are exquisite gypsum rosettes and intricately involved helictites.
The order contains about fifty species in fifteen genera, twelve of which occur in fresh water while three are marine; and includes both floating and submerged forms. Hydrocharis floats on the surface of still water, and has rosettes of kidney-shaped leaves, from among which spring the flower-stalks; stolons bearing new leafrosettes are sent out on all sides, the plant thus propagating itself in the same way as the strawberry.
Stratiotes aloides has a rosette of stiff swordlike leaves, which when the plant is in flower project above the Surface; it is also stoloniferous, the young rosettes sinking to the bottom at the beginning of winter and rising again to the surface in the spring.
For ornament women wear silver ankle-rings with bells, silver necklaces and silver or gold rosettes in the ears.
Cleveland's Cabinet and Marion's Avenue, each a mile long, are adorned by myriads of gypsum rosettes and curiously twisted crystals, called "oulopholites."