aquatic plant with deep green foliage useful to oxygenate an aquarium; sometimes placed in genus Egeria
having prickly leaves
having fine leaves
having fan-shaped leaves
submerged freshwater perennials
having leaves or leaves as specified; often used in combination
permitting little if any light to pass through because of denseness of matter
hard to pass through because of dense growth
having high relative density or specific gravity
slow to learn or understand; lacking intellectual acuity
