- any plant of the large taxonomically complicated American genus Oenothera, typically having yellow flowers that open in the evening: family OnagraceaeSee evening primrose
C20: from Greek oinothēras, ?from onothēras a plant whose roots smell of wine
Examples from the Web for oenothera
The European types of Oenothera biennis and O. muricata are in the same condition.
MacDougal also obtained a more or less distinct mutant of Oenothera biennis.
Oenothera biennis has been seen bearing flowers of three different colours.