Compilation
Potamogeton tenuifolius

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Name

Identification
Isotype of Potamogeton pusillus L. [family POTAMOGETONACEAE ] (stored under name); Verified by Data not digitized, Potamogeton tenuifolius F. Phil. [family POTAMOGETONACEAE ] Verified by Data not digitized,
Related name
  • Potamogeton aschersonii
  • Potamogeton berteroanus
  • Potamogeton tenuifolium
  • Potamogeton pusillus
  • Potamogeton pectinatus
  • Potamogeton tenuifolius
  • Stuckenia pectinata
Common name
  • Potamot alpin, Flora of North America Vol. 22

Flora

Entry for Potamogeton alpinus Balbis [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 alpinus Balbis [family POTAMOGETONACEAE], Misc. Bot., 13. 1804
Potamogeton alpinus subsp. tenuifolius (Rafinesque) Hultén [family POTAMOGETONACEAE]
Potamogeton alpinus var. subellipticus (Fernald) Ogden [family POTAMOGETONACEAE]
Potamogeton alpinus var. tenuifolius (Rafinesque) Ogden [family POTAMOGETONACEAE]
Potamogeton tenuifolius Rafinesque [family POTAMOGETONACEAE]
Potamogeton tenuifolius var. subellipticus Fernald [family POTAMOGETONACEAE]
Information
Rhizome present. Cauline stems terete, without spots, to 200 cm; nodal glands absent. . Turions absent. Leaves submersed and floating or floating absent, ± spirally arranged. Submersed leaves sessile, lax; stipules persistent, inconspicuous, convolute, free from blade, light brown to reddish, not ligulate, (1.2--)1.5--2.5(--4) cm, not fibrous, not shredding at tip, apex blunt; blade reddish green, oblong-linear to linear-lanceolate, not arcuate, 4.5--18(--25) cm ´ 5--20 mm, base rounded, without basal lobes, slightly clasping, margins entire, not crispate, apex not hoodlike, obtuse or acute, lacunae in 0--6 rows each side of midvein; veins 7--9. Floating leaves: petioles continuous in color to apex, 0.1--1.2 cm; blade reddish green, elliptic or oblanceolate to obovate or oblong-linear, 4--7(--10) cm ´ 10--25(--40) mm, base gradually tapering into petiole, apex obtuse or acute; veins (7--)9--13(--15). Inflorescences unbranched, emersed; peduncles not dimorphic, terminal or axillary, erect, cylindric, 3--10(--16) cm; spikes not dimorphic, cylindric, 10--35 mm. Fruits pedicellate, tawny olive-green, obovoid, plump, turgid, abaxially keeled, laterally keeled or not, (2.5--)3--3.5 ´ (1.7--)2--2.4 mm, lateral keels when present without points; beak abaxially curved, 0.5--0.9 mm; sides without basal tubercles; embryo with 1 full spiral. 2n = 52.
Phenology
Flowering early summer--fall
Altitude range
400--2500 m
Distribution
GreenlandEuropeAsia Eurasia.USA AlaskaUSA Calif.USA Colo.USA IdahoUSA MaineUSA Mass.USA Mich.USA Minn.USA Mont.USA Nev.USA N.H.USA N.J.USA N.Y.USA Oreg.USA Pa.USA S.Dak.USA UtahUSA Vt.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
Plants of Potamogeton alpinus often are red whenever taken from the water, a feature that makes this species quite distinctive.
Two varieties, Potamogeton alpinus var. tenuifolius and var. subellipticus, have been recognized in North America, based mainly on submersed leaf shape. Plants bearing both leaf types have been observed in the same population; hence the varieties are not recognized.
Four hybrids, Potamogeton alpinus × P. nodosus (= P. ×subobtusus Hagström), P. alpinus × P. gramineus (= P. xnericius Hagström), P. alpinus × P. praelongus (= P. ×griffithii A. Bennett), and P. alpinus × P. perfoliatus (= P. ×prussicus Hagström), have been described.

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