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Potamogeton nodosus

Poir. (1816)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Monocots Order: Alismatales Family: Potamogetonaceae Genus: Potamogeton

long-leaved pondweed

Description

Key Characters:

Growth Form: Plants only partly submerged.

Stems: Stems stout, nearly terete (cylindrical), 4–15(–20) dm long, unbranched or branched toward apex, arising from rather stout, spreading rhizomes.

Roots: Fibrous root system.

Leaves: Leaves simple. Alternate. Blades dimorphic, submerged ones thin and flaccid, linear–lanceolate to elliptic–lanceolate, 100–200(–300) mm long, 10–20 (–35) mm wide; floating leaves coriaceous, elliptic to oblong–elliptic, (30–)50–120 mm long, (15–)20–40 mm wide. Apex of submerged plants acute; apex of floating plants obtuse to mucronate. Base submerged: attenuate to base; floating: base cuneate. Surfaces glabrous. Submerged leaves 7–15-veined, floating leaves usually 10–20 veined. Petioles of all leaves directly attached at the node; 20–100(–130) mm long. Stipules distinct, those of submerged leaves delicate and caducous, (30–)40–80 mm long, those of floating leaves slightly wider.

Flowers: Flowers numerous in congested spikes 30–60 mm long, peduncles stout, (30–)50–150 mm long. Flowers small, wind–pollinated, bisexual (perfect), actinomorphic. Perianth of 4 tepals in 1 series. greenish or greenish brown, 1.5–2.5 mm long. Stamens 4 in 1 series, opposite the tepals, adnate to the claw; anthers subsessile, dithecal, opening by longitudinal slits, extrorse. Pollen spheric. Ovary superior, carpels 4, distinct, alternate with the stamens; ovule 1, attached to the ventral margin of the carpel usually toward the base, orthotropous, usually becoming campylotropous or anatropous after fertilization; style short, terminal, or absent; stigma dry, not papillose.

Fruit: Fruit obliquely obovoid; 3.5–4 mm long; dorsal keel sharp and prominent; the 2 lateral keels rounded and less prominent; style persistent; 0.3–0.5 mm long. Seeds without endosperm.

Ploidy: 2n = 52

Habitat: Occurring at low elevations in taro paddies; ditches; and ponds on O'ahu and Maui.

Elevation Range:

Historical Distribution

Synonyms (56)

Potamogeton americanus Cham. & Schltdl. (1827)
Potamogeton americanus subsp. mascarensis (Cham. & Schltdl.) A.Benn. (1908)
Potamogeton americanus var. novaeboracensis (Morong) A.Benn. (1893)
Potamogeton americanus var. thunbergii (Cham. & Schltdl.) A.Benn. (1897)
Potamogeton canariensis Link (1828)
Potamogeton drucei Fryer (1898)
Potamogeton fluitans (Misapplied) Roth (1788)
Potamogeton indicus Roxb. (1820)
Potamogeton insulanus Hagstr. (1916)
Potamogeton leschenaultii Cham. & Schltdl. (1827)
Potamogeton lonchites var. novaeboracensis Morong (1893)
Potamogeton machianus Lowe ex Graebn. (1907)
Potamogeton malaianus Miq. (1870)
Potamogeton mascarensis Cham. & Schltdl. (1827)
Potamogeton mexicanus A.Benn. (1887)
Potamogeton montanus C.Presl (1825)
Potamogeton natans f. capensis Kunth (1841)
Potamogeton natans var. canariensis (Link) T.Durand & Schinz (1894)
Potamogeton natans var. capensis T.Durand & Schinz (1894)
Potamogeton natans var. mexicanus M.Martens & Galeotti (1843)
Potamogeton natans var. serotinus (Schrad. ex Schult. & Schult.f.) Boiss. (1882)
Potamogeton nodosus f. angustissimus Hagstr. (1916)
Potamogeton nodosus f. brevifolius (G.Fisch.) Soó (1971)
Potamogeton nodosus f. congestus (G.Fisch.) Soó (1971)
Potamogeton nodosus f. latifolius (G.Fisch.) Soó (1971)
Potamogeton nodosus f. spathulifolius (G.Fisch.) Soó (1971)
Potamogeton nodosus var. stagnatilis (W.D.J.Koch) Soó (1971)
Potamogeton nuttallii var. portoricensis (Graebn.) Graebn. (1907)
Potamogeton o-waihiensis Cham. & Schltdl. (1827)
Potamogeton occidentalis Sieber ex Cham. & Schltdl. (1827)
Potamogeton owaihiensis Cham. & Schltdl. (1827)
Potamogeton pensylvanicus var. portoricensis Graebn. (1903)
Potamogeton peruviana C.Presl (1890)
Potamogeton petiolaris Raf. (1811)
Potamogeton rotundatus Hagstr. (1916)
Potamogeton roxburghianus Schult. & Schult.f. (1827)
Potamogeton roxburghii F.Dietr. (1837)
Potamogeton semicoloratus A.Benn. (1910)
Potamogeton serotinus Schrad. (1827)
Potamogeton stagnorum Hagstr. (1916)
Potamogeton syriacus Cham. & Schltdl. (1827)
Potamogeton thunbergii Cham. & Schltdl. (1827)
Potamogeton × fluitans f. brevifolius G.Fisch. (1907)
Potamogeton × fluitans f. congestus G.Fisch. (1907)
Potamogeton × fluitans f. latifolius G.Fisch. (1907)
Potamogeton × fluitans f. spathulifolius G.Fisch. (1907)
Potamogeton × fluitans proles mascarensis (Cham. & Schltdl.) Graebn. (1907)
Potamogeton × fluitans proles novaeboracensis (Morong) Graebn. (1907)
Potamogeton × fluitans proles syriacus (Cham. & Schltdl.) Graebn. (1907)
Potamogeton × fluitans proles thunbergii (Cham. & Schltdl.) Graebn. (1907)
Potamogeton × fluitans subsp. americanus Graebn. (1907)
Potamogeton × fluitans var. americanus (Graebn.) P.Fourn. (1935)
Potamogeton × fluitans var. canariensis (Link) Webb & Berthel. (1847)
Potamogeton × fluitans var. novaeboracensis (Morong) Graebn. (1907)
Potamogeton × fluitans var. robustus Tab.Morais (1936)
Potamogeton × fluitans var. stagnatilis W.D.J.Koch (1844)

Uses and Culture

USES

Natural History

Statewide Status

Indigenous

Island Status

O'ahu Indigenous
Maui Indigenous

Dispersal Agents


Pollinators

Bibliography

Name Published In: J.B.A.M.de Lamarck, Encycl., Suppl. 4: 535 (1816)

Other References

Wagner et al. 1990:1607 (O, M); Herbst 1998:4 (DESCR)

Occurrences

SNo. Scientific Name Scientific Name Authorship Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Potamogeton nodosus Poir. No locality information available PRESERVED_SPECIMEN Chamisso LD
2 Potamogeton nodosus Poir. maui, kailua n slope of haleakala main ditch. PRESERVED_SPECIMEN forbes, c. n. 2502m NSW 1020-06-13
3 Potamogeton nodosus Poir. no locality information available PRESERVED_SPECIMEN chamisso LD
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