Compilation
Potamogeton berchtoldii

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Name

Identification
Isotype of Potamogeton hoggarensis Dandy [family POTAMOGETONACEAE ] Potamogeton berchtoldii Fieb. [family POTAMOGETONACEAE ] (stored under name); Verified by Kaplan,Z.,
Related name
  • Potamogeton mucronatus schrad. ex sond. x pusillus
  • Potamogeton panormitanus
  • Potamogeton panormitanus x pusillus
  • Potamogeton pusillus
  • Potamogeton hoggarensis
  • Potamogeton compressus
  • Potamogeton dualis
  • Potamogeton obtusifolius x pusillus
  • Potamogeton obtusifolia x trichoides
  • Potamogeton not on sheet
  • Potamogeton lacunatus
  • Potamogeton franconicus
  • Potamogeton confinis
  • Potamogeton mucronatus schrad. x panormitanus
  • Potamogeton x franconicus
  • Potamogeton gallicus
  • Potamogeton saxonicus
  • Potamogeton reticulatus
  • Potamogeton obtusifolius mert. & w.d.j.koch x trichoides
  • Potamogeton pusillus x trichoides
  • Potamogeton berchtoldii
  • Potamogeton rutilus
Common name
  • Potamot très ténu, Flora of North America Vol. 22

Flora

Entry for Potamogeton pusillus subsp. tenuissimus (Mertens & W. D. J. Koch) R. R. Haynes & Hellquist [family POTAMOGETONACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 22,
Names
Potamogeton pusillus subsp. tenuissimus (Mertens & W. D. J. Koch) R. R. Haynes & Hellquist [family POTAMOGETONACEAE], Novon, 6: 370. 1996
Potamogeton pusillus var. tenuissimus Mertens & W. D. J. Koch [family POTAMOGETONACEAE], in J. C. Röhling, Deutschl. Fl. ed., 3, 1: 857. 1823
Potamogeton berchtoldii Fieber [family POTAMOGETONACEAE]
Potamogeton berchtoldii Fieber var. colpophilus (Fernald) Fernald [family POTAMOGETONACEAE]
Potamogeton berchtoldii Fieber var. lacunatus (Hagström) Fernald [family POTAMOGETONACEAE]
Potamogeton berchtoldii Fieber var. polyphyllus (Morong) Fernald [family POTAMOGETONACEAE]
Potamogeton berchtoldii Fieber var. tenuissimus (Mertens & W. D. J. Koch) Fernald [family POTAMOGETONACEAE]
Information
Leaves: stipules convolute; blade 0.9--5.4 cm ´ 0.2--2.5 mm; apex acute to obtuse, lacunae in 1--5 rows each side of midrib; veins 1--3(--5). Inflorescences: peduncles more than 3 per plant, cylindric to slightly clavate; spikes capitate to cylindric, continuous. Fruits ovoid, sides rounded, rarely concave; beak median, rarely toward adaxial edge. 2n = 26.
Phenology
Flowering and fruiting summer--fall
Altitude range
0--2100 m
Distribution
Eurasia.USA Ala.USA AlaskaUSA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA D.C.USA Fla.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Ky.USA La.USA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA Miss.USA Mont.USA Nev.USA N.H.USA N.J.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Oreg.USA Pa.USA R.I.USA S.C.USA Vt.USA Va.USA Wash.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada Nfld. and Labr.Canada N.W.T.Canada N.S.Canada NunavutCanada Ont.Canada P.E.I.Canada Que.Canada Sask.Canada Yukon
Discussion
Although Delaware and West Virginia lies within the mapped area, we know of no collections from that state.
Potamogeton pusillus subsp. tenuissimus is the most common linear-leaved subspecies of the family in temperate North America. Whenever one finds a linear-leaved pondweed with 1--5 rows of lacunae on each side of the midvein, chances are that it is subsp. tenuissimus.
Only Potamogeton obtusifolius could be confused with the taxon, and it can be separated by having its cylindric inflorescence, whereas subsp. tenuissimus has a capitate inflorescence.

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