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acute +  and obtuse +
Robert R. Haynes +  and C. Barre Hellquist +
(Mertens & W. D. J. Koch) R. R. Haynes & Hellquist +
tapering +
Potamogeton pusillus var. tenuissimus +
reddish +, pale green +  and olive-green +
0.9 cm9 mm <br />0.009 m <br /> (5.4 cm54 mm <br />0.054 m <br />) +
elliptic;ovate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
terete +  and slightly compressed +
18 cm180 mm <br />0.18 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
Potamot très ténu +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Ala. +, Alaska +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mont. +, Nev. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, Vt. +, Va. +, Wash. +, Wis. +, Wyo. +  and Eurasia +
0–2100 m +
green +  and brown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
white +, brown +, gold +  and green +
0 cm0 mm <br />0 m <br /> (?) +  and 0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +
Shallow waters of lakes and streams +
emersed +  and submersed +
axillary +  and terminal +
cylindric +  and capitate +
arranged +  and 2-ranked +
submersed +
not crispate +
orthotropous +
not pedunculate +
emersed +  and submersed +
cylindric +  and capitate +
not spiraling +
6.2 cm62 mm <br />0.062 m <br /> (6.6 cm66 mm <br />0.066 m <br />) +
not dimorphic +
recurved;erect +
terminal +  and axillary +
cylindric +  and slightly clavate +
0.5 cm5 mm <br />0.005 m <br /> (6.2 cm62 mm <br />0.062 m <br />) +
Flowering and fruiting summer–fall. +
short-stipitate +  and stipitate +
4 +  and 1 +
auriculate +  and not auriculate +
not persisting +
concave +  and rounded +
not dimorphic +
emersed +  and submersed +
capitate +  and cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.01 cm10.1 mm <br />0.0101 m <br />) +
epitepalous +
compressed;terete +
brown +  and green or white +
free +  and connate +
inconspicuous +
0.31 cm3.1 mm <br />0.0031 m <br /> (0.92 cm9.2 mm <br />0.0092 m <br />) +
Potamogeton berchtoldii +, Potamogeton berchtoldii var. colpophilus +, Potamogeton berchtoldii var. lacunatus +, Potamogeton berchtoldii var. polyphyllus +  and Potamogeton berchtoldii var. tenuissimus +
Potamogeton pusillus subsp. tenuissimus +
Potamogeton pusillus +
subspecies +
fibrous +
0.9 cm9 mm <br />0.009 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
terminal +  and lateral +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
1 (?) +  and 3 (?) +
caulescent +, not rhizomatous +  and rhizomatous +
annual +  and perennial +