Myosoton aquaticum (L.) Moench
Giantchickweed
Species recognized by The Integrated Taxonomic Information System
, T Orrell (custodian) in 
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General Description
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Source and Additional Information
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Editor
Flora of North America Editorial Committee
Location
Source URL
Citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Reports of Myosoton aquaticum from Louisiana appear to be based on misidentified specimens of Stellaria cuspidata Willdenow ex Schlechtendal subsp. prostrata (Baldwin) J. K. Morton.
Although occurring over a wide area, Myosoton aquaticum is often noted as rare or occasional in particular states or provinces. Very few collections of this species from the flora area were made prior to 1900; two of the first gatherings were from port areas (Baltimore, Maryland, and as a ballast plant in Philadelphia, Pennsylvania, in 1877). Its presence outside the Japanese Pavillion at the Philadelphia Centennial Grounds in 1878 (Scribner 50 and 51, MO) suggests an escape from an intentional introduction.
References
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Flora of North America @ eFloras.org
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200000001
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Description
Source and Additional Information
Supplier
Project
Editor
Flora of North America Editorial Committee
Location
Source URL
Citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Stems 10-100 cm, minutely glandular-pilose distally. Leaf blades 2-3.5(-8.5) × 1-2(-4.4) cm. Pedicels 1-2(-3) cm, minutely glandular-pilose. Flowers: sepals 4-6 mm, to 9 mm in fruit; petals 4-7 mm, mostly exceeding sepals. Capsules 5-10 mm, usually slightly exceeding calyx. 2n = 20(?) (Asia), 28 (Europe, Asia), 29 (Europe).
References
-
Flora of North America @ eFloras.org
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200000001
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Comments
Source and Additional Information
Supplier
Source
Project
Editor
Wu Zhengyi, Peter H. Raven & Hong Deyuan
Location
Source URL
Citation
Flora of China Vol. 6: 38 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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This species is used medicinally, as a wild vegetable, and as fodder.
References
-
Flora of China @ eFloras.org
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200005226
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Description
Source and Additional Information
Supplier
Source
Project
Editor
Wu Zhengyi, Peter H. Raven & Hong Deyuan
Location
Source URL
Citation
Flora of China Vol. 6: 38 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Stems 20--80 cm, weak, apically glandular hairy. Proximal leaves petiolate; distal leaves sessile; leaf blade 2.5--5.5 × 1--3 cm, pubescent or glabrous, base rounded or subcordate, margin undulate, apex acute. Flowers terminal or axillary; bracts leaflike, margin glandular hairy; pedicel 1--2 cm, slender, densely glandular hairy. Sepals ovate-lanceolate, 4--5 mm, to ca. 7 mm in fruit, abaxially glandular pubescent, margin narrowly membranous. Petals bifid to base; lobes lanceolate, 3--3.5 mm. Stamens shorter than petals. Ovary ovoid; styles linear. Capsule pendent from spreading pedicel, exceeding sepals. Seeds rusty brown, globose, ca. 1 mm, mammillate. Fl. May--Jun, fr. Jun--Aug. 2n = 20*, 28.
References
-
Flora of China @ eFloras.org
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200005226
Description
Source and Additional Information
This adventive perennial plant is 12½' tall, branching occasionally. The stems are erect or spreading, and more or less hairy. The opposite leaves are up to 2" long and 1" across. They are cordate-ovate, smooth along the margins, slightly pubescent, and usually sessile (the lower leaves may have short petioles). Single flowers may develop from the leaf axils of the upper stems, while the remaining flowers occur in small clusters at the end of stems. Each flower is about ½" across when it is fully open, consisting of 5 white petals that are cleft, 5 green sepals that are ovate and pubescent, 5 slender white styles, and 10 stamens. There is some variability across populations of plants regarding how deeply cleft the petals are. These petals are slightly longer to much longer than the sepals. The pedicel of each flower is conspicuously pubescent and up to 1" long. The blooming period occurs from late spring to late summer and lasts about 2-3 months. Each flower is replaced by a seed capsule that is ovoid and single-celled; it contains several seeds. Each seed is orbicular-reniform and minutely bumpy across the surface. The root system is fibrous and produces rhizomes, which enables this plant to form vegetative colonies.
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"Myosoton aquaticum (L.) Moench". Encyclopedia of Life, available from "http://www.eol.org/pages/587273". Accessed
19 Mar 2010.
