Taxon Report

Potamogeton robbinsii Oakes

Robbins' pondweed

Print Report

Taxon Summary

Potamogeton robbinsii, commonly known as Robbins' pondweed, is a perennial rhizomatous herb (aquatic) in the Potamogetonaceae that is found in California and elsewhere. It occurs within Marshes and swamps (lakes, and deep water), growing at elevations from 1530 to 3300 meters. Potamogeton robbinsii is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Potamogeton robbinsii Oakes
Common Name:	Robbins' pondweed
Family:	Potamogetonaceae
Element Code:	PMPOT030Z0
USDA Plants Symbol:	PORO2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb (aquatic)
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	1530-3300 (5020-10825)
General Habitats:	Marshes and swamps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G5
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	IUCN_LC
CRPR Changes:	changed from 2.3 to 2B.3 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	17
Element Occurrence Ranks:
Excellent (A)	3
Good (B)	3
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	11

Location


California Endemic: False
California Counties and Islands: Name (Code)
Alpine (ALP), El Dorado (ELD), Fresno (FRE), Inyo (INY), Madera (MAD), Mariposa (MPA), Mono (MNO), Nevada (NEV), Plumas (PLU), Sierra (SIE), Siskiyou (SIS), Tuolumne (TUO)
Quads: Name (Quad Code)
Belden (4012113), Coyote Flat (3711824), Crystal Crag (3711951), Ebbetts Pass (3811957), El Capitan (3711966), Freel Peak (3811978), Hume (3611878), Independence Lake (3912043), Koip Peak (3711972), Lake Eleanor (3711987), Mammoth Mtn. (3711961), Marble Mountain (4112352), Medicine Mtn. (4112343), Mt. Thompson (3711825), Pacific Valley (3811958), Truckee (3912032), Ukonom Lake (4112353)

Threat List Data from the CNDDB


Threat List Total:	5
EOs with Threat Listed:	Total EOs	% of EOs
	4	24 %
Other	2	11%
Recreational use (non-ORV)	1	5%
Altered flood/tidal/hydrologic regime	1	5%
Erosion/runoff	1	5%
Non-native plant impacts	1	5%

Notes




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 27 January 2025].