BugwoodWiki Article

European waterstarwort
Callitriche stagnalis Scop.


Callitriche stagnalis is an aquatic perennial with elongate stems that can grow from 3.94-11.81 in. (1-3 dm) in length.
Its leaves are opposite, entire and somewhat diverse in form, depending on whether they are submerged or floating. The floating leaves are spatulate-obovate in shape, have 5 to 7 veins, are 0.12-0.31 in. (3-8 mm) wide and up to 0.79 in. (2 cm) long. The submerged leaves are typically linear, have a single vein and grow 0.16-0.39 in. (4-10 mm) in length; however, they can also be broader and more closely resemble the floating leaves.
Callitriche stagnalis is monoecious. The staminate and pistillate flowers are tiny, simple in structure and typically located right next to one another in the leaf axils. This close proximity facilitates aerial self-pollination. The flowers have two small bracts at their bases, which may help the flowers to float on the water, also facilitating pollination.
The fruits are nearly round (suborbicular) and 0.06-0.08 in. (1.5-2 mm) thick. Each mericarp of the fruit has a thin (0.004 in. / 0.1 mm) winged margin running from its base to its apex.
Ecological Threat
Callitriche stagnalis is capable of creating locally dense mats of vegetation that may crowd out native aquatic vegetation.


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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org

State Invasives List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Callitrichales
Family: Callitrichaceae
Genus: Callitriche

Other System Links

Plants: CAST
Bayer: CLTST
GRIN: 454812
ITIS: 32062

Synonyms and Other Names

Other Common Names:
pond water-starwort


Category: Aquatic