Vascular Plants - Caryophyllaceae - Myosoton:
Myosoton aquaticum
Page Author: Don Knoke
water chickweed, giant chickweed 
Blooms: June - October
Habit: herb
Duration: perennial
Origin: Introduced from Europe
Distribution: Introduced in much of eastern United States; occasional in the Pacific Coast states and British Columbia.
Habitat: Stream banks, woods, marshes and wet meadows.
Species Description:

General: Straggling, herbaceous perennial, the stems decumbent to ascending, simple or branched, up to 6 dm. tall, pubescent above.
Leaves: Leaves opposite, ovate, the tip acute, the lower leaves petiolate, gradually reduced upward, becoming sessile above
Flowers: Flowers solitary in the leaf axils, long petiolate; sepals 5, green, linear-oblanceolate; petals 5, white, deeply notched, about 7 mm. long, much longer than the sepals; stamens 10; styles 5.
Fruits: Capsule globose-ovoid, opening by 5 valves.

Distinguishing Characteristics: Capsule
Accepted Name:
Myosoton aquaticum (L.) Moench
Alsine aquatica (L.) Britton
Cerastium aquaticum L.
Stellaria aquatica (Linnaeus) Scopoli

Treated in Flora of the PNW as:
Additional Resources:

PNW Herbaria Specimens: View list of all Myosoton aquaticum specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Myosoton aquaticum specimens in the WTU Herbarium database.

Washington Flora Checklist: Myosoton aquaticum treatment.

E-Flora BC: Myosoton aquaticum atlas page.

CalPhotos: Myosoton aquaticum images.

USDA Plants Database: Myosoton aquaticum.
Additional photographs of Myosoton aquaticum:
(click on a thumbnail to view larger photo)

Richard Old

Richard Old

Richard Old
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Burke Museum

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Washington Native Plant Society
WA Native Plant Society