1. Onagraceae Evening Primrose Family
Ca4 Co4 A4 or 8 G4

2. Evening Primrose Family
Onagraceae
Evening Primrose Family
18 genera/640 species
Worldwide distribution; center of diversity is SW United States and Mexico

3. Herbs with simple leaves, these alternate or opposite

4. Flowers perfect, actinomorphic, 4-partate
Androecium of 4 or 8 stamens
4-lobed stigma: cross-shaped

5. common evening primrose
- Elongate hypanthium present
- Ovary inferior, of 4 fused carpels
Oenothera biennis
common evening primrose

7. Fruit a capsule

8. Economic importance: a few are ornamentals
Oenothera pilosella
prairie sundrops
Fuchsia sp.

9. Enchanter’s nightshade
Local flora:
Oenothera biennis
Evening primrose
Circaea canadensis
Enchanter’s nightshade

10. Epilobium hirsutum
Hairy willow herb

11. Epilobium coloratum
cinnamon willow-herb

12. Chamaenerion angustifolium
Fireweed