dense : Idioms & Phrases
dense blazing star
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noun perennial of southeastern and central United States having very dense spikes of purple flowers; often cultivated for cut flowers
Liatris pycnostachya.
WordNet
dense-leaved elodea
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noun aquatic plant with deep green foliage useful to oxygenate an aquarium; sometimes placed in genus Egeria
Egeria densa; Elodea densa.