Sium sp.
(c) Paul Roots, some rights reserved (CC BY), uploaded by Paul Roots · licence
Family: Apiaceae · Type: Perennial · Native
Sium sp. is a native California perennial in the Apiaceae family.
How to tell it apart
vs Oenanthe: Sium fruits have thick corky ribs but no crown; Oenanthe fruits have a crown of teeth on top.; vs Berula: Sium has thick, obvious ribs on fruits; Berula has thread-like ribs hidden in the corky wall.; vs Apium: Sium fruit halves stick firmly to the central axis; Apium fruit halves separate cleanly.; vs Perideridia: Sium grows from fibrous roots in wetlands; Perideridia grows from tubers in dry grasslands.; vs Oxypolis: Sium fruits are ribbed but rounded; Oxypolis fruits are flattened front-to-back with thin wings.
Frequently asked questions
Is Sium sp. native to California?
Yes. Sium sp. is native to California (recorded as native).
What plant family does Sium sp. belong to?
Sium sp. is in the Apiaceae family, genus Sium.
Related species
Other California species in the same genus, family, or bioregion.
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.