Pacific Island Ecosystems at Risk (PIER)

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Ceratophyllum llerenae
Fassett, Ceratophyllaceae
No images for this taxon


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Ceratophyllum muricatum Cham. subsp. australe (Griseb.) Les

Common name(s): [more details]

English: prickly hornwort

Habit:  aquatic herb

Description: 

"Ceratophyllum demersum L.:  "Submerged herb, richly branched, to 2 m long or sometimes longer; main stems terete, 1-3 mm diameter, smooth.  Leaves dark to bright green, rather coarse, 3-12 per node, 8-15 (-20) mm long, each leaf mostly divided twice forming four ± linear leaflets, these 4-12 (-15) mm long, serrulate, apically and dorsally provided with solitary, minute hairs.  Staminate and pistillate flowers mixed in the axils of each leaf whorl; staminate flowers with 6-12 pale green tepals and 10-12 stamens.  Fruits fleshy, brownish or dark green, the body smooth or somewhat tuberculate, broadly ellipsoid, 3.5-6 x 2-4 mm, with one apical (persistent style) and two basal spines 0.1-14 mm long."

"Ceratophyllum muricatum Cham. subsp. australe (Griseb.) Les (=Ceratophyllum llerenae Fassett): Similar to C. demersum but leaves yellowish green, dichotomously divided two to four times, segments usually inflated at base, fruits with surfaces tuberculate or papillate, and fruit margins sometimes winged and spinulose"  (Ståhl, 2003; pp. 27-28).

Habitat/ecology:  Submerged aquatic (Ståhl, 2003; pp. 27-28).

Propagation:  Seed?

Native range:  Southeastern US to South America (Ståhl, 2003; pp. 27-28). Naturalized elsewhere (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Colombia
Colombia
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
Ståhl, Bertil (2003) (p. 28)
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)
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)

Comments:  Probably not native to the Galápagos Islands, probably introduced per Charles Darwin Research Institute.


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This page was created on 18 JUN 2004 and was last updated on 12 OCT 2006.