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Myriophyllum aquaticum

(Vell.) Verdc. (1973)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-CoreEudicot Order: Saxifragales Family: Haloragaceae Genus: Myriophyllum

parrot's feather, water feather, watermilfoil

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Description

Key Characters:

Growth Form: Herbaceous, rooted, submerged to emergent plant.

Stems: Stems prostrate to ascending or erect, often rooting at the lower nodes, 2–5 dm long, unbranched or branched.

Roots:

Leaves: Leaves simple. Leaves in whorls of 3–6 per node. Blades 2–3,5 cm long, with 8–15 linear segments 3–8 mm long on each side of the midrib. Margins entire, toothed, or deeply dissected. Petioles to 9.6 mm long. Stipules absent.

Flowers: Flowers sessile, usually in the axils of the upper, reduced leaves, usually above the surface of the water, each flower often subtended by persistent or deciduous bracteoles. Flowers unisexual, uppermost usually staminate, lower ones pistillate. Calyx of saminate flowers (2)4-lobed, Calyx of pistillate flowers 4-toothed, ca. 1 mm long. Corolla of staminate flowers with petals (0)2–4; pistillate flowers with corolla (petals) absent. Stamens in staminate flowers 2, 4, or 8; anthers tetrathecal, opening by slits. Ovary inferior (pistillate flowers), 4-celled; ovules anatropous, pendulous from apex; styles as many as sepals, rarely half as many, feathery; stigmas 4, recurved and plumose.

Fruit: Fruit ca. 3 mm long; separating into 4 nut-like segments at maturity; these sometimes tuberculate on the back; the sepals persistent on the fruit; erect or reflexed. Seeds 1–4; endosperm copious; fleshy and oily.

Ploidy:

Habitat: Naturalized in permanent standing or running water; especially in taro paddies and pastures.

Elevation Range: 0–1,280 m.

Historical Distribution

Images

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Uses and Culture

USES

  • Yes

Natural History

Statewide Status

Naturalized

Island Status

Kaua'i Naturalized
O'ahu Naturalized
Hawai'i Naturalized

Dispersal Agents

Water/Ocean
Other Animals

Vegetative Reproduction

Pollinators

Specimens

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Bibliography

Name Published In: Kew Bull. 28: 36 (1973)

Other References

Wagner et al. 1990:792 (K, O, H); Staples & Herbst 2005:351 (DESCR)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Myriophyllum aquaticum Kailua, 209 Oneawa Kai Pl garden pond Preserved_Specimen Staples, G.W. 965 Oahu BISH 1994-11-30
2 Myriophyllum aquaticum Pearl Harbor Bike Path, Pearl City. Growing from a culvert near south side of HECO Power Plant, where the bike path passes over a small bridge. Preserved_Specimen Ross, M.C. 1972 Oahu BISH 2024-02-05
3 Myriophyllum aquaticum Hilo, Wailoa estuary Preserved_Specimen Stemmermann, R.L. 7177 Hawaii BISH 1987-07-25
4 Myriophyllum aquaticum RT-30, Lahaina, HI, US UNKNOWN Hawaii HAPI 12/31/1989
5 Myriophyllum aquaticum Waipio Valley Taro patches Preserved_Specimen Degener, O. 21785 Hawaii BISH 1952-02-07
6 Myriophyllum aquaticum Kohala Mts; 0.3-0.5 km W of Pu'u Iki & Pu'u Kamau Wet ohi'a forest with other native trees and a tree fern and native shrub understory Preserved_Specimen Stemmermann, L. 3999 Hawaii BISH 1979-03-08
7 Myriophyllum aquaticum Honolulu County, HI, USA UNKNOWN Kauai HAPI 12/31/1989
8 Myriophyllum aquaticum Waipio Valley, Hamakua District, near sea level UNKNOWN Hawaii HAPI 4/2/2009
9 Myriophyllum aquaticum Hamakua District, Kukuihaele quad, Waipio Valley Dominant aquatic herb in operating taro lo'i, along with Commelina diffusa, Panicum repens, Eichhornia crassipes. Preserved_Specimen Imada, C. 200110 Hawaii BISH 2001-03-13
10 Myriophyllum aquaticum Kehena Ditch Trail, Kohala Mts poos in stream bed Preserved_Specimen Fosberg, F.R. 10192 Hawaii BISH 1933-09-02
11 Myriophyllum aquaticum Kahua Ranch, Kohala Mts sunken spot, ~1 acre, standing water in pasture. Abundant Myriophyllum and much Juncus Preserved_Specimen Davis, J. 739 Hawaii BISH 1982-04-09
12 Myriophyllum aquaticum North Kohala District; Hawi Quadrangle, Parker Ranch. Stock ponds in vicinity of Kehena Reservoir Emergent vegetation growing along shore & standing water. Floating submergent. Preserved_Specimen Engilis Jr., A. 9205 Hawaii BISH 1992-06-08
13 Myriophyllum aquaticum Waipio Valley, Hamakua District, near sea level Growing inmud among rocks behind Waipio Beach. Common plants in the area are Scaevola taccada and Pluchea odorata. Preserved_Specimen Cuddihy, L.W. 788 Hawaii BISH 1981-03-28
14 Myriophyllum aquaticum Puu Manu Keliku, Kohala Mt. Forest Reserve poos and streams Preserved_Specimen St.John, H. 18565 Hawaii BISH 1937-12-28
15 Myriophyllum aquaticum Honolulu, University of Hawaii Manoa campus; Courtyard of Krause Hall, growing in the lily pool cultivated aquatic plant, growing among a dense mat of floating plants Preserved_Specimen Herbst, D.R. 9590 Oahu BISH 1992-04-04
16 Myriophyllum aquaticum Honolulu, 3785 Old Pali Rd flooded large pot in full sun Preserved_Specimen Lau, J. 2273 Oahu BISH 1986-04-21
17 Myriophyllum aquaticum Waipio stream marshy tributary of Waipio stream Preserved_Specimen St.John, H. 24010 Hawaii BISH 1950-01-01
18 Myriophyllum aquaticum Manoa taro ponds Preserved_Specimen Forbes, C.N. 2562 Oahu BISH 1919-05-19
19 Myriophyllum aquaticum Machuu Taro Farm, Waipio Valley, Big Island, Hawaii Growing in fallow taro loi, in water. Preserved_Specimen Crago, L.M. 2005108 Hawaii BISH 2005-03-19
20 Myriophyllum aquaticum Wailoa estuary, Hilo Preserved_Specimen Stemmermann, R.L. 7177 Hawaii BISH 1987-07-25
21 Myriophyllum aquaticum Keaukaha, Richardson Ocean Parks Pools Preserved_Specimen McDermid, K.J. 23334 Hawaii BISH 1998-01-29
22 Myriophyllum aquaticum Kailua, 209 Oneawa Kai Pl garden pond Preserved_Specimen Staples, G.W. 965 Oahu BISH 1994-11-30
23 Myriophyllum aquaticum Pearl Harbor Bike Path, Pearl City. Growing from a culvert near south side of HECO Power Plant, where the bike path passes over a small bridge. Preserved_Specimen Ross, M.C. 1972 Oahu BISH 2024-02-05
24 Myriophyllum aquaticum Hilo, Wailoa estuary Preserved_Specimen Stemmermann, R.L. 7177 Hawaii BISH 1987-07-25
25 Myriophyllum aquaticum RT-30, Lahaina, HI, US UNKNOWN Hawaii HAPI 12/31/1989
26 Myriophyllum aquaticum Waipio Valley Taro patches Preserved_Specimen Degener, O. 21785 Hawaii BISH 1952-02-07
27 Myriophyllum aquaticum Kohala Mts; 0.3-0.5 km W of Pu'u Iki & Pu'u Kamau Wet ohi'a forest with other native trees and a tree fern and native shrub understory Preserved_Specimen Stemmermann, L. 3999 Hawaii BISH 1979-03-08
28 Myriophyllum aquaticum Honolulu County, HI, USA UNKNOWN Kauai HAPI 12/31/1989
29 Myriophyllum aquaticum Waipio Valley, Hamakua District, near sea level UNKNOWN Hawaii HAPI 4/2/2009
30 Myriophyllum aquaticum Hamakua District, Kukuihaele quad, Waipio Valley Dominant aquatic herb in operating taro lo'i, along with Commelina diffusa, Panicum repens, Eichhornia crassipes. Preserved_Specimen Imada, C. 200110 Hawaii BISH 2001-03-13
31 Myriophyllum aquaticum Kehena Ditch Trail, Kohala Mts poos in stream bed Preserved_Specimen Fosberg, F.R. 10192 Hawaii BISH 1933-09-02
32 Myriophyllum aquaticum Kahua Ranch, Kohala Mts sunken spot, ~1 acre, standing water in pasture. Abundant Myriophyllum and much Juncus Preserved_Specimen Davis, J. 739 Hawaii BISH 1982-04-09
33 Myriophyllum aquaticum North Kohala District; Hawi Quadrangle, Parker Ranch. Stock ponds in vicinity of Kehena Reservoir Emergent vegetation growing along shore & standing water. Floating submergent. Preserved_Specimen Engilis Jr., A. 9205 Hawaii BISH 1992-06-08
34 Myriophyllum aquaticum Waipio Valley, Hamakua District, near sea level Growing inmud among rocks behind Waipio Beach. Common plants in the area are Scaevola taccada and Pluchea odorata. Preserved_Specimen Cuddihy, L.W. 788 Hawaii BISH 1981-03-28
35 Myriophyllum aquaticum Puu Manu Keliku, Kohala Mt. Forest Reserve poos and streams Preserved_Specimen St.John, H. 18565 Hawaii BISH 1937-12-28
36 Myriophyllum aquaticum Honolulu, University of Hawaii Manoa campus; Courtyard of Krause Hall, growing in the lily pool cultivated aquatic plant, growing among a dense mat of floating plants Preserved_Specimen Herbst, D.R. 9590 Oahu BISH 1992-04-04
37 Myriophyllum aquaticum Honolulu, 3785 Old Pali Rd flooded large pot in full sun Preserved_Specimen Lau, J. 2273 Oahu BISH 1986-04-21
38 Myriophyllum aquaticum Waipio stream marshy tributary of Waipio stream Preserved_Specimen St.John, H. 24010 Hawaii BISH 1950-01-01
39 Myriophyllum aquaticum Manoa taro ponds Preserved_Specimen Forbes, C.N. 2562 Oahu BISH 1919-05-19
40 Myriophyllum aquaticum Machuu Taro Farm, Waipio Valley, Big Island, Hawaii Growing in fallow taro loi, in water. Preserved_Specimen Crago, L.M. 2005108 Hawaii BISH 2005-03-19
41 Myriophyllum aquaticum Wailoa estuary, Hilo Preserved_Specimen Stemmermann, R.L. 7177 Hawaii BISH 1987-07-25
42 Myriophyllum aquaticum Keaukaha, Richardson Ocean Parks Pools Preserved_Specimen McDermid, K.J. 23334 Hawaii BISH 1998-01-29
43 Myriophyllum aquaticum Kailua, 209 Oneawa Kai Pl garden pond Preserved_Specimen Staples, G.W. 965 Oahu BISH 1994-11-30
44 Myriophyllum aquaticum Pearl Harbor Bike Path, Pearl City. Growing from a culvert near south side of HECO Power Plant, where the bike path passes over a small bridge. Preserved_Specimen Ross, M.C. 1972 Oahu BISH 2024-02-05
45 Myriophyllum aquaticum Hilo, Wailoa estuary Preserved_Specimen Stemmermann, R.L. 7177 Hawaii BISH 1987-07-25
46 Myriophyllum aquaticum RT-30, Lahaina, HI, US UNKNOWN Hawaii HAPI 12/31/1989
47 Myriophyllum aquaticum Waipio Valley Taro patches Preserved_Specimen Degener, O. 21785 Hawaii BISH 1952-02-07
48 Myriophyllum aquaticum Kohala Mts; 0.3-0.5 km W of Pu'u Iki & Pu'u Kamau Wet ohi'a forest with other native trees and a tree fern and native shrub understory Preserved_Specimen Stemmermann, L. 3999 Hawaii BISH 1979-03-08
49 Myriophyllum aquaticum Honolulu County, HI, USA UNKNOWN Kauai HAPI 12/31/1989
50 Myriophyllum aquaticum Waipio Valley, Hamakua District, near sea level UNKNOWN Hawaii HAPI 4/2/2009
51 Myriophyllum aquaticum Hamakua District, Kukuihaele quad, Waipio Valley Dominant aquatic herb in operating taro lo'i, along with Commelina diffusa, Panicum repens, Eichhornia crassipes. Preserved_Specimen Imada, C. 200110 Hawaii BISH 2001-03-13
52 Myriophyllum aquaticum Kehena Ditch Trail, Kohala Mts poos in stream bed Preserved_Specimen Fosberg, F.R. 10192 Hawaii BISH 1933-09-02
53 Myriophyllum aquaticum Kahua Ranch, Kohala Mts sunken spot, ~1 acre, standing water in pasture. Abundant Myriophyllum and much Juncus Preserved_Specimen Davis, J. 739 Hawaii BISH 1982-04-09
54 Myriophyllum aquaticum North Kohala District; Hawi Quadrangle, Parker Ranch. Stock ponds in vicinity of Kehena Reservoir Emergent vegetation growing along shore & standing water. Floating submergent. Preserved_Specimen Engilis Jr., A. 9205 Hawaii BISH 1992-06-08
55 Myriophyllum aquaticum Waipio Valley, Hamakua District, near sea level Growing inmud among rocks behind Waipio Beach. Common plants in the area are Scaevola taccada and Pluchea odorata. Preserved_Specimen Cuddihy, L.W. 788 Hawaii BISH 1981-03-28
56 Myriophyllum aquaticum Puu Manu Keliku, Kohala Mt. Forest Reserve poos and streams Preserved_Specimen St.John, H. 18565 Hawaii BISH 1937-12-28
57 Myriophyllum aquaticum Honolulu, University of Hawaii Manoa campus; Courtyard of Krause Hall, growing in the lily pool cultivated aquatic plant, growing among a dense mat of floating plants Preserved_Specimen Herbst, D.R. 9590 Oahu BISH 1992-04-04
58 Myriophyllum aquaticum Honolulu, 3785 Old Pali Rd flooded large pot in full sun Preserved_Specimen Lau, J. 2273 Oahu BISH 1986-04-21
59 Myriophyllum aquaticum Waipio stream marshy tributary of Waipio stream Preserved_Specimen St.John, H. 24010 Hawaii BISH 1950-01-01
60 Myriophyllum aquaticum Manoa taro ponds Preserved_Specimen Forbes, C.N. 2562 Oahu BISH 1919-05-19
61 Myriophyllum aquaticum Machuu Taro Farm, Waipio Valley, Big Island, Hawaii Growing in fallow taro loi, in water. Preserved_Specimen Crago, L.M. 2005108 Hawaii BISH 2005-03-19
62 Myriophyllum aquaticum Wailoa estuary, Hilo Preserved_Specimen Stemmermann, R.L. 7177 Hawaii BISH 1987-07-25
63 Myriophyllum aquaticum Keaukaha, Richardson Ocean Parks Pools Preserved_Specimen McDermid, K.J. 23334 Hawaii BISH 1998-01-29
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