exacum
noun
ex·a·cum
ˈeksəkəm
1
capitalized
: a genus of tropical Asiatic and African plants (family Gentianaceae) including one species (E. affine) of herbaceous biennials with bluish to dark lavender flowers that are often cultivated in the greenhouse
2
plural -s
: any plant of the genus Exacum
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Merriam-Webster unabridged
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