Taxon Report

Potamogeton praelongus Wulfen

white-stemmed pondweed

Print Report

Taxon Summary

Potamogeton praelongus, commonly known as white-stemmed 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 1800 to 3000 meters. Potamogeton praelongus is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Potamogeton praelongus Wulfen
Common Name:	white-stemmed pondweed
Family:	Potamogetonaceae
Element Code:	PMPOT030V0
USDA Plants Symbol:	POPR5
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb (aquatic)
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	1800-3000 (5905-9845)
General Habitats:	Marshes and swamps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G5
State Rank:	S2
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:	12
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	11

Location


California Endemic: False
California Counties and Islands: Name (Code)
El Dorado (ELD), Lassen (LAS), Madera (MAD), Mono (MNO), Nevada (NEV), Plumas (PLU), Shasta (SHA), Sierra (SIE), Trinity (TRI)
Quads: Name (Quad Code)
Almanor (4012122), Antelope Lake (4012025), Canyondam (4012121), Caples Lake (3812061), Chester (4012132), Crystal Crag (3711951), Dunderberg Peak (3811913), English Mtn. (3912045), June Lake (3711971), Lundy (3811912), Mammoth Mtn. (3711961), Manzanita Lake (4012155), Mt. Harkness (4012143), Mumbo Basin (4112225), Webber Peak (3912044), Westwood West (4012131)

Threat List Data from the CNDDB


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

Notes



Hybridizes with P. richardsonii.
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 28 March 2025].