Flora of North America species comparison

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Potamogeton foliosus subsp. fibrillosus
Photo is of parent taxon

fibrous pondweed
Stems

glands common, to 0.5 mm diam.
Leaves

stipules brown or rarely white, fibrous, shredding at tip, veins in age remaining as fibers.
Inflorescences

spikes interrupted.
Fruits

pale -green, 1.4–1.7 × 1.1–1.2 mm;

keel less than or equal to 0.2 mm high;

beak less than or equal to 0.2 mm.
Chromosome number

unknownnot available.

Potamogeton foliosus subsp. fibrillosus
Phenology Flowering and fruiting summer–fall.
Habitat Warm waters of shallow lakes, springs, streams, and rivers
Elevation 600–2700 m (2000–8900 ft)
Distribution
from FNA
CA; ID; OR; UT; WA; WY
Discussion

Potammogeton foliosus subsp. fibrillosus is known from the warm waters of the northwestern United States. It differs from subsp. foliosus by the stipular tissue between the veins decomposing, leaving only strands formed by the fibrous veins. In addition, nodal glands are quite common.

Of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22.
Parent taxa Potamogetonaceae > Potamogeton > Potamogeton foliosus
Sibling taxa
P. foliosus subsp. foliosus
Synonyms P. fibrillosus, P. foliosus var. fibrillosus
Name authority (Fernald) R. R. Haynes & Hellquist: Novon 6: 370. (1996)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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