Taxon Report

Cicuta maculata L. var. bolanderi (S. Watson) G.A. Mulligan

Bolander's water-hemlock

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Taxon Summary

Cicuta maculata var. bolanderi, commonly known as Bolander's water-hemlock, is a perennial herb in the Apiaceae that is found in California and elsewhere. It occurs within Marshes and swamps (brackish, coastal, and freshwater), growing at elevations from 0 to 200 meters. Cicuta maculata var. bolanderi is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Cicuta maculata L. var. bolanderi (S. Watson) G.A. Mulligan
Common Name:	Bolander's water-hemlock
Family:	Apiaceae
Element Code:	PDAPI0M051
USDA Plants Symbol:	CIMAB
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jul-Sep	Jul-Sep
Elevation:	0-200 (0-655)
General Habitats:	Marshes and swamps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.1
Global Rank:	G5T4T5
State Rank:	S2?
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:	changed from 2.1 to 2B.1 on 2013-06-12 added to 2.1 on 2009-01-05

Occurrence Data from the CNDDB


Total Occurrences:	17
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	2
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	14

Location


California Endemic: False
California Counties and Islands: Name (Code)
Contra Costa (CCA), Marin (MRN), Sacramento (SAC), Santa Barbara (SBA)*, Solano (SOL)
Quads: Name (Quad Code)
Antioch North (3812117), Benicia (3812212), Birds Landing (3812127), Brentwood (3712186), Briones Valley (3712282), Bruceville (3812134), Casmalia (3412075), Courtland (3812135), Dozier (3812137), Drakes Bay (3812218), Fairfield South (3812221), Honker Bay (3812118), Inverness (3812217), Isleton (3812125), Jersey Island (3812116), Thornton (3812124), Tomales (3812228), Vine Hill (3812211)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	6 %
Erosion/runoff	1	5%
Recreational use (non-ORV)	1	5%

Notes




Threats:
Threatened by development, non-native plants, and hydrological alterations.
Taxonomy:

Selected References

Proposed Addition to CRPR 2.1, G5T3T4 / S2.1 (2009)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 February 2025].