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Potamogeton foliosus

Raf. (1808)

This name is accepted

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

leafy pondweed

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Description

Key Characters:

Growth Form: Plants completely submerged.

Stems: Stems slender, slightly compressed and inconspicuously winged, 2–10 dm long, many branched, arising from a dense mat of slender rhizomes.

Roots: Fibrous root system.

Leaves: Leaves simple. Alternate, occasionally the upper ones subopposite. Blades linear, 10–100 mm long, (0.3–)1–1.5(–2.5) mm wide, (1–)3–5–nerved. Apex acute to cuspidate. Base attenuate, attached directly at the node. Surfaces glabrous. Sheathing. Stipules connate into a tubular sheath, the sheath 5–15 mm long, rupturing and deciduous, with portions persistent.

Flowers: Flowers few in subglobose to subcapitate spikes 1–5 mm long, peduncles stout, 3–15(–20) mm long. Flowers small, wind–pollinated, bisexual (perfect), actinomorphic. Perianth of 4 tepals in 1 series, greenish, 0.5–1 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; 1.5–2(–2.5) mm long; dorsal keel prominent undulate–dentate; the 2 lateral keels obscure; style persistent; 0.1–0.4 mm long. Seeds without endosperm.

Ploidy: 2n = 14; 26; 28

Habitat: Aquatic; occurring in streams; taro paddies; and man–made watercourses such as irrigation ditches.

Elevation Range: 0–190 m.

Historical Distribution

Images

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Accepted Subtaxa (in Hawai'i) (1)

Potamogeton foliosus subsp. foliosus

Uses and Culture

USES

Natural History

Statewide Status

Indigenous

Island Status

Kaua'i Indigenous
O'ahu Indigenous
Maui Indigenous
Hawai'i Indigenous

Dispersal Agents


Pollinators

Bibliography

Name Published In: Med. Repos., ser. 2, 5: 354 (1808)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Potamogeton foliosus Kailua; edge of Kaelepulu Pond W borders Preserved_Specimen Neal, M.C. Oahu BISH 1940-06-11
2 Potamogeton foliosus Kailua, N slope of Haleakala, upper Ditch Preserved_Specimen Forbes, C.N. 2503 Maui BISH 1920-06-14
3 Potamogeton foliosus Waipahu, Kipapa Gulch at mouth of stream Preserved_Specimen Hosaka, E.Y. 1246 Oahu BISH 1933-12-17
4 Potamogeton foliosus Kalihi Valley Taro patches. Preserved_Specimen Forbes, C.N. 1516 Oahu BISH 1909-06-16
5 Potamogeton foliosus Honolii Taro patches. Preserved_Specimen Forbes, C.N. Kauai BISH 1909-08-01
6 Potamogeton foliosus E part of hanakapiai Valley Submerged in small swift stream. Preserved_Specimen St.John, H. 13890 Kauai BISH 1933-12-30
7 Potamogeton foliosus Hanakapiai, Napali Coast Small stream. Preserved_Specimen St.John, H. 10935 Kauai BISH 1930-12-31
8 Potamogeton foliosus W Maui, Lahaina District, Honokowai, Honokohau Ditch Submerged in ditch. Preserved_Specimen Oppenheimer, H.L. 119917 Maui BISH 1999-11-24
9 Potamogeton foliosus West Maui, Wailuku, N of Ooawa kilika Gulch, Waihee Ditch Shallow, flowing water. Associated vegetation: Vallisneria Preserved_Specimen Oppenheimer, H.L. 120515 Maui BISH 2005-12-21
10 Potamogeton foliosus Hanalei, Limahuli Garden, Hwy 56, W of Haena lower garden, taro lohi Preserved_Specimen submerged; rooting in mud, clear flowing water 15 cm deep; leaves bright green Lorence, D.H. 9506 Kauai BISH 2006-02-18
11 Potamogeton foliosus Headwaters of N fork of Wailua River, area called The Blue Hole or The Crater just E of Mt Waialeale and Kawaikini Deep valley surrounded by steep cliffs ca 1000 m high laced with waterfalls; low primary vegetation of small, stunted trees 1-2 m tall, numerous pteridophytes, and Gunnera over saturated, rocky ground. Preserved_Specimen Submerged aquatic rooting at bottom of small pool of standing water. Lorence, D.H. 5322 Kauai BISH 1987-07-23
12 Potamogeton foliosus Hala Ula Maulili Rd., Surety Ranch LLC Kohala Flume Ditch, Big Island, Hawaii Open flume, attached to bottom, flowing water. Preserved_Specimen Grass-like submerged aquatic plant. Translucent, dark green leaves and stems. Crago, L.M. 2005119 Hawaii BISH 2005-03-20
13 Potamogeton foliosus Kealia Valley found in manmade drainage from the Slippery Slide area of valley; immersed completely in fast moving water Preserved_Specimen pondweed Caraway, V. 155 Kauai BISH 1997-09-01
14 Potamogeton foliosus Punaluu, Kau District In brackish water. Preserved_Specimen St.John, H. 11321 Hawaii BISH 1931-12-25
15 Potamogeton foliosus Morgan Toledo Taro Farm, Waipio Valley, Big Island, Hawaii In taro loi, rooted to the bottom mud, where water flows into pond. Preserved_Specimen Grass-like submerged plant, dark green lvs, small white and peach flower-like spikes that break the surface of the water. Crago, L.M. 2005092 Hawaii BISH 2005-03-19
16 Potamogeton foliosus Oahu Preserved_Specimen Mann, H. 21 Oahu BISH 1864-01-01
17 Potamogeton foliosus N fork of Wailua River Large colony with Vallisneria in Lihue Plantation's dam; associated with wet native grasses, guava, Melastoma, banana, kava, etc. Preserved_Specimen Herbst, D.R. 2937 Kauai BISH 1973-03-27
18 Potamogeton foliosus Honolii Taro Patches. Preserved_Specimen Forbes, C.N. Kauai BISH 1909-08-01
19 Potamogeton foliosus Hilo-Wailoa River mauka of Keawe Bridge In water 2ft deep. Preserved_Specimen Stemmermann, R.L. 7187 Hawaii BISH 1987-08-14
20 Potamogeton foliosus Pohakuhapai Ditch Trail, kamalomaloo Submerged in ditch. Preserved_Specimen St.John, H. 23127 Kauai BISH 1947-12-29
21 Potamogeton foliosus unknown Preserved_Specimen Hillebrand, W.B. BISH
22 Potamogeton foliosus Huleia River Preserved_Specimen Forbes, C.N. 739 Kauai BISH 1916-10-01
23 Potamogeton foliosus n fork of the Wailua River behind dam at mouth of Iliiliula N Wailua Ditch intake Preserved_Specimen Flynn, T.W. 898 Kauai BISH 1984-07-18
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