What is "oenothera biennis"

Rampion \Ram"pi*on\ (r[a^]m"p[i^]*[u^]n), n. [Cf. F. raiponce, Sp. ruiponce, reponche, L. raperonzo, NL. rapuntium, fr. L. rapum, rapa, a turnip, rape. Cf. Rape a plant.] (Bot.) A plant ( Campanula Rapunculus) of the Bellflower family, with a tuberous esculent root; -- also called ramps.

Note: The name is sometimes given to plants of the genus Phyteuma, herbs of the Bellflower family, and to the American evening primrose ( [OE]nothera biennis), which has run wild in some parts of Europe.

Oenothera biennis (common evening-primrose, evening star, or sun drop) is a species of Oenothera native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely naturalized elsewhere in temperate and subtropical regions. Evening primrose oil is produced from the plant.