Flora of North America species comparison

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Potamogeton foliosus subsp. fibrillosus

Potamogeton foliosus subsp. foliosus
Photo is of parent taxon

fibrous pondweed
Photo is of parent taxon

leafy pondweed, potamot feuille
Stems

glands common, to 0.5 mm diam.

glands rarely present, less than or equal to 0.3 mm diam.
Leaves

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

stipules greenish to brown, delicate to slightly fibrous, veins decaying with age.
Inflorescences

spikes interrupted.

spikes continuous, rarely 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.

olive-green to green-brown, 1.5–2.7 × 1.2–2.2 mm;

keel greater than or equal to 0.2 mm high;

beak 0.2–0.6 mm.
Chromosome number

unknownnot available.

2n

= 28.

Potamogeton foliosus subsp. fibrillosus

Potamogeton foliosus subsp. foliosus
Phenology Flowering and fruiting summer–fall. Flowering and fruiting spring–fall.
Habitat Warm waters of shallow lakes, springs, streams, and rivers Wide variety of waters of lakes and streams, either slow- or rapidly flowing
Elevation 600–2700 m (2000–8900 ft) 0–2300 m (0–7500 ft)
Distribution
from FNA
CA; ID; OR; UT; WA; WY
from FNA
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NS; NT; ON; PE; QC; SK; YT; Mexico; West Indies; Central America (Guatemala, Costa Rica)
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.)

Potamogeton foliosus subsp. foliosus is probably the most common linear-leaved species of the family in North America, and it is probably the easiest to determine. Any linear-leaved Potamogeton specimen with fruits having an undulating winglike abaxial keel most likely is this taxon.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22. FNA vol. 22.
Parent taxa Potamogetonaceae > Potamogeton > Potamogeton foliosus Potamogetonaceae > Potamogeton > Potamogeton foliosus
Sibling taxa
P. foliosus subsp. foliosus
P. foliosus subsp. fibrillosus
Synonyms P. fibrillosus, P. foliosus var. fibrillosus P. curtissii, P. foliosus var. macellus
Name authority (Fernald) R. R. Haynes & Hellquist: Novon 6: 370. (1996) unknown
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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