Are Calendula and Oenothera Biennis in the same botanical family?

No — Calendula is Asteraceae and Oenothera Biennis is Onagraceae.

Can you substitute Calendula for Oenothera Biennis?

They come from different families (Asteraceae and Onagraceae), so direct substitution is uncommon.

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Calendula vs Oenothera Biennis

Calendula officinalis · Oenothera biennis

Calendula

Calendula officinalis

T Traditional Use

Family: Asteraceae
Genus: Calendula
Primary use: medicinal

Calendula officinalis, Mary's gold, common marigold, the pot marigold, Scotch marigold, or ruddles, is a flowering plant in the daisy family, Asteraceae. It is probably native to southern Europe, but its long history of cultivation makes its precise origin unknown, and it is wide…

Oenothera Biennis

Oenothera biennis

T Traditional Use

Family: Onagraceae
Genus: Oenothera
Primary use: medicinal

Oenothera biennis, the common evening-primrose, is a species of flowering plant in the family Onagraceae, 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 an…

At a glance

· Different families — Asteraceae vs Onagraceae.
· Both are primarily medicinal.
· Evidence tiers — Calendula: T; Oenothera Biennis: T.