Taxon Report

Rhynchospora globularis (Chapm.) Small

round-headed beaked-rush

Print Report

Taxon Summary

Rhynchospora globularis, commonly known as round-headed beaked-rush, is a perennial rhizomatous herb in the Cyperaceae that is found in California and elsewhere. It occurs within Marshes and swamps, growing at elevations from 45 to 60 meters. Rhynchospora globularis is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Rhynchospora globularis (Chapm.) Small
Common Name:	round-headed beaked-rush
Family:	Cyperaceae
Element Code:	PMCYP0N0W0
USDA Plants Symbol:	RHGL2
Synonyms/Other Names:	Rhynchospora globularis var. globularis

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	45-60 (150-195)
General Habitats:	Marshes and swamps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.1
Global Rank:	G5
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.1 to 2B.1 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	3
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	1
Poor (D)	0
None (X)	1
Unknown (U)	1

Location


California Endemic: False
California Counties and Islands: Name (Code)
Sonoma (SON)
Quads: Name (Quad Code)
Sebastopol (3812247), Two Rock (3812237)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	2	67 %
Development	1	33%
Non-native plant impacts	1	33%
Other	1	33%

Notes



Seriously threatened by marsh habitat loss and non-native plants.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 14 November 2025].