BugwoodWiki Article

European waterstarwort
Callitriche stagnalis Scop.

Overview

Appearance
Callitriche stagnalis is an aquatic perennial with elongate stems that can grow from 3.94-11.81 in. (1-3 dm) in length.
Foliage
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.
Flowers
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.
Fruit
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.

Resources

Selected Images


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5447140

European waterstarwort
Callitriche stagnalis
Infestation
Leslie J. Mehrhoff
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5447155

European waterstarwort
Callitriche stagnalis
Infestation
Leslie J. Mehrhoff
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5447165

European waterstarwort
Callitriche stagnalis
Infestation
Leslie J. Mehrhoff
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5447157

European waterstarwort
Callitriche stagnalis
Infestation
Leslie J. Mehrhoff
5270060
5270060

European waterstarwort
Callitriche stagnalis
Plant(s)
Leslie J. Mehrhoff
5447156
5447156

European waterstarwort
Callitriche stagnalis
Plant(s)
Leslie J. Mehrhoff
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5447133

European waterstarwort
Callitriche stagnalis
Plant(s)
Leslie J. Mehrhoff
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5447169

European waterstarwort
Callitriche stagnalis
Plant(s)
Leslie J. Mehrhoff
5447134
5447134

European waterstarwort
Callitriche stagnalis
Plant(s)
Leslie J. Mehrhoff
5447164
5447164

European waterstarwort
Callitriche stagnalis
Plant(s)
Leslie J. Mehrhoff
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5447145

European waterstarwort
Callitriche stagnalis
Foliage
Leslie J. Mehrhoff
5447139
5447139

European waterstarwort
Callitriche stagnalis
Foliage
Leslie J. Mehrhoff

Maps


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

State Regulated 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

Categories

Category: Aquatic