Present on Pacific Islands?  yes

Threat only at high elevations?  no

Common name(s): [more details]

English: terrestrial water-starwort

Habit:  herb

Description:  "Plants prostrate or ascending, often forming dense tufts or small mats, the stems usually 5 cm long or less; leaves short-petiolate, spatulate or obovate, 3-4 mm long or sometimes slightly larger, 3-nerved, obtuse, acute at the base; fruit about 0.6 mm long and twice as broad, deeply emarginate at each end, the lobes with a narrow marginal wing; peduncles shorter than the fruit or slightly exceeding it; styles persistent, not longer than the fruit, spreading or reflexed" (Standley & Steyermark, 1949; p. 171).

Habitat/ecology:  In Guatemala, "moist or usually wet banks or fields, in shaded or open places, sometimes growing in shallow water, often in mid, sometimes in moist soil of patios or in gardens, 1,200-3,700 meters" (Standley & Steyermark, 1949; p. 171).

Propagation:  Seed?

Native range:  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
Ecuador (Galápagos Islands) Isabela Group	Volcan Alcedo	probably introduced invasive	Charles Darwin Research Station (2005)
Ecuador (Galápagos Islands) Isabela Group	Volcan Sierra Negra	probably introduced invasive	Charles Darwin Research Station (2005)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	probably introduced invasive	Charles Darwin Research Station (2005)
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	probably introduced invasive	Charles Darwin Research Station (2005)

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. (2008)
Ecuador (Mainland) Ecuador	Ecuador (Republic of) (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2008)

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

Additional information:
Additional online information about Callitriche deflexa is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Callitriche deflexa as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Callitriche deflexa may be available from the Germplasm Resources Information Network (GRIN).

References:

Charles Darwin Research Station. 2005. CDRS Herbarium records.

Standley, Paul C./Steyermark, Julian A. 1949. Flora of Guatemala. Fieldiana: Botany. Vol. 24, Part VI. Chicago Natural History Museum. 440 pp.

U. S. Government. 2006. Integrated Taxonomic Information System (ITIS) (on-line resource).

U.S. Dept. Agr., Agr. Res. Serv. 2008. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.