Pacific Island Ecosystems at Risk (PIER)

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Eleocharis radicans
(A. Dietr.) Kunth, Cyperaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Eleocharis acicularis (L.) Roem. & Schult. var. radicans (Poir.) Britton; Eleogiton radicans A. Dietr.; Scirpus radicans Poir.

Common name(s): [more details]

English: rooted spikerush

Habit:  sedge

Description:  "Perennials, forming mats, stolons slender; culms pale green, soft, spongy, filiform, 3-8 cm tall, ca. 0.3 mm in diameter.  Sheaths pale, membranous, 0.5-2 cm long, fugacious.  Spikelets 5-12-flowered, greenish white, ovoid, 3-4 mm long, ca. 1 mm wide, acute; glumes greenish white or occasionally faintly tinged brown, lanceolate-ovate, 1.2-1.5 mm long, acute to subacute, the keel green; bristles 4, nearly white, very slender, retrorsely spinulose, longer than the achene; style base depressed-conical, minute; stigmas 3.  Achenes yellow, narrowly obovoid, trigonous, 0.6-0.7 mm long, finely cancellate with several rows of horizontally oblong cells"  (Wagner et al., 1999; p. 1403).

"This species is closely related to Eleocharis acicularis, from which it differs in its much smaller anthers (0.3 vs. 1 mm long) and pale glumes"  (Wagner et al., 1999; p. 1403).

Habitat/ecology:  In Hawai‘i, "naturalized in taro paddies, along streams, and in marshes, 20-1,220 m"  (Wagner et al., 1999; p. 1403).

Propagation:  Seed

Native range:  United States, Mexico, Central and South America (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Imada, Clyde T./Staples, George W./Herbst, Derral R. (2000) (p. 12)
Voucher cited: C. Imada 99-30 (BISH)
"In wetland taro paddy".
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1403)
Voucher cited: Forbes 777.K (BISH)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1403)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1403)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Chile (continental)
Chile
Chile (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
El Salvador
El Salvador
El Salvador (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Jalisco, Mexico, Michoacan, Sinaloa, Sonora
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (California) native
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) native
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast)
United States (other states)
USA (Florida) native
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)

Comments:  Adventive in Puerto Rico (GRIN).


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 9 FEB 2010 and was last updated on 21 APR 2013.