World English Dictionary
oenothera (ˌiːnəˈθɪərə)
See evening primrose any plant of the large taxonomically complicated American genus Oenothera, typically having yellow flowers that open in the evening: family Onagraceae
[C20: from Greek oinothēras, ?from onothēras a plant whose roots smell of wine]

Collins English Dictionary - Complete & Unabridged 10th Edition
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chiefly North American herbs with usually nocturnal flowers 
WordNet® 3.0, © 2006 by Princeton University.
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