Taxon Report

Calamagrostis bolanderi Thurb.

Bolander's reed grass

Print Report

Taxon Summary

Calamagrostis bolanderi, commonly known as Bolander's reed grass, is a perennial rhizomatous herb in the Poaceae that is found only in California. It occurs within Bogs and fens, Broadleafed upland forest, Closed-cone coniferous forest, Coastal scrub, Marshes and swamps (freshwater), Meadows and seeps (mesic), and North Coast coniferous forest, growing at elevations from 0 to 455 meters. Calamagrostis bolanderi is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Calamagrostis bolanderi Thurb.
Common Name:	Bolander's reed grass
Family:	Poaceae
Element Code:	PMPOA17010
USDA Plants Symbol:	CABO
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: May-Aug	May-Aug
Elevation:	0-455 (0-1495)
General Habitats:	Bogs and fens, Broadleafed upland forest, Closed-cone coniferous forest, Coastal scrub, Marshes and swamps, Meadows and seeps, North Coast coniferous forest
Microhabitat:	Mesic
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 1B to 4.2 on 2003-03-14

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Humboldt (HUM), Mendocino (MEN), Sonoma (SON)
Quads: Name (Quad Code)
Annapolis (3812363), Comptche (3912335), Crannell (4112411), Dutchmans Knoll (3912356), Elk (3912326), Eureka Hill (3812385), Fort Bragg (3912347), Gualala (3812375), Hales Grove (3912377), Inglenook (3912357), Mallo Pass Creek (3912316), Mathison Peak (3912336), Mendocino (3912337), Navarro (3912325), Northspur (3912345), Noyo Hill (3912346), Piercy (3912387), Plantation (3812353), Point Arena (3812386), Rodgers Peak (4112421), Saunders Reef (3812376), Sebastopol (3812247), Sherwood Peak (3912355), Stewarts Point (3812364), Trinidad (4112412), Two Rock (3812237)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Possibly threatened by vehicles, logging, development, and grazing.
Threats:

Taxonomy:

Selected References

Proposed Change from CRPR 1B, G2 / S2.2 to 4, G3 / S3.2 (2003)

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].