Epilobium sp.
Willowherb, Willowherb
Family: Onagraceae · Type: Annual · Variable; species dependent
Epilobium sp. (Willowherb) is a non-native California annual in the Onagraceae family.
How to tell it apart
vs Penstemon: Epilobium has 4 notched petals and opposite leaves; Penstemon has 5-lobed tubular flowers (snapdragon family).; vs Gambelia: Epilobium has 4 notched petals; Gambelia has 5-lobed tubular snapdragon-like flowers.; vs Fuchsia: Epilobium has notched petals spreading flat; Fuchsia has dangling tubular flowers with protruding stamens.; vs Keckiella: Epilobium has 4 notched petals; Keckiella has 5-lobed tubular snapdragon-like flowers.; vs Diplacus: Epilobium has 4 notched petals; Diplacus has 5-lobed tubular monkey flowers.
Frequently asked questions
Is Epilobium sp. native to California?
No. Epilobium sp. is not native to California (recorded as variable; species dependent).
What plant family does Epilobium sp. belong to?
Epilobium sp. is in the Onagraceae family, genus Epilobium.
Related species
Other California species in the same genus, family, or bioregion.
- Epilobium torreyi — Narrow boisduvalia
- Epilobium anagallidifolium — Alpine willowherb
- Epilobium brachycarpum — Annual fireweed
- Epilobium campestre — Smooth boisduvalia
- Epilobium canum — California fuchsia
- Epilobium canum subsp. canum
- Eremothera boothii — Booth's sun cup
- Eremothera boothii subsp. alyssoides — Pine creek evening-primrose
- Eremothera boothii subsp. boothii — Booth's evening-primrose
Sources: Jepson eFlora · CalPhotos
Last updated 2026-04-14
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.