Comments
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anglais
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fourni par eFloras
Unlike the other species of Caltha in North America, C . natans is relatively invariable morphologically and has not been divided into segregate taxa.
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Description
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anglais
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Stems leafy, floating or creeping, rooting at nodes. Basal leaves: blade ovate-reniform or cordate, largest 1-2.5 × 1-5 cm, margins nearly entire. Inflorescences 2-6-flowered. Flowers 8-13 mm diam.; sepals white or pinkish, 4-7(-8) mm. Follicles 20-55, widely spreading, sessile, oblong; bodies 3.2-6.5 × 1-2.5 mm; style and stigma curved, 0.1-0.4 mm. Seeds broadly elliptic, 0.5-0.8 mm. 2 n =16, 32.
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Description
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anglais
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fourni par eFloras
Plants submerged or creeping. Stems 20--50 cm tall, 2--4 mm in diam., branched. Cauline leaves long petiolate; petiole 2.5--7 cm, sheathed at base; leaf blade cordate-reniform or cordate, 1--2 × 1.5--2.4 cm, base deeply cordate-reniform or cordate, margin entire or repand or crenulate below middle, apex rounded. Monochasium terminal, (2- or)3--5-flowered. Pedicels 2--4 cm. Flowers small, ca. 5 mm in diam. Sepals 5, white or pinkish, obovate, ca. 3 × 2 mm, apex rounded. Stamens ca. 2 mm; anthers elliptic, ca. 0.5 mm. Follicles (10--)20--30, ca. 5 mm, sessile; stigmas nearly sessile. Seeds black, ellipsoid-globose, less than 1 mm. Fl. Jul. 2n = 16, 32.
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Distribution
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anglais
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Alta., B.C., Man., N.W.T., Ont., Sask., Yukon; Alaska, Minn., Wis.; Eurasia.
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Flowering/Fruiting
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Flowering late spring-summer (Jun-Aug).
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Habitat
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anglais
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Floating or on moist mud, ponds, lakes, slow-moving rivers and streams; 25-1500m.
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Habitat & Distribution
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anglais
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fourni par eFloras
Wet meadows, marshes, in water. Heilongjiang, NE Nei Mongol [Mongolia, Russia (Siberia); North America].
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Synonym
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Thacla natans (Pallas) Deyl & Sojak.
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Caltha natans
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anglais
)
fourni par wikipedia EN
Caltha natans is a species of flowering plant in the buttercup family. It goes by the common name floating marsh marigold.[2]
Description
Caltha natans is an aquatic herbaceous perennial that is insect pollinated. Unlike other species of Caltha that are found in North America, C. natans shows relatively little morphological variation, and has not been divided into infraspecific taxa. The plants typically grow in shallow water, with floating leaves up to 25 millimetres (0.98 in) wide and 50 mm (2.0 in) long,[3] on a petiole (leaf stalk) up to 70 mm (2.8 in) long.[4] The flowers are roughly 5 mm (0.20 in) in diameter and have five white or pinkish sepals; they are produced in late spring (June–August).[3] Each flower forms 20–55 follicles, which contain black, elliptic seeds 0.5–0.8 mm (0.020–0.031 in) in diameter.[3][4]
Distribution
Caltha natans has an amphi-Beringian distribution, being found in both North America and East Asia. In Asia, it is found in Siberia, Mongolia and the Chinese provinces of Heilongjiang and Nei Mongol.[4] In North America, it is found in Alaska, the Canadian provinces of British Columbia, North West Territories, Yukon, Saskatchewan Alberta, Manitoba and Ontario, and in a small part of the contiguous United States (in the states of Minnesota and Wisconsin).[3]
In Minnesota it is list as a threatened species, it is generally rare or very localized throughout its native range in North America, It has only been found a few times south of the Canadian boarder and a number of these locations have been wiped out by habitat loss.[5]
Habitat
Caltha natans is found growing in shallow, slow-moving streams and creeks, it is also found in pools, ditches, and along sheltered lake margins, swamps, and beaver ponds. The stems root at the nodes in mud, silt, or clay. It can be found growing in populations with a few scattered individuals, or as dense mats consisting of many plants. In Minnesota, C. natans has been found growing with other plants like Glyceria spp. (manna grass), Carex spp. (sedges), Potamogeton spp. (pondweed), and Utricularia spp. (bladderwort).[6]
References
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Caltha natans: Brief Summary
(
anglais
)
fourni par wikipedia EN
Caltha natans is a species of flowering plant in the buttercup family. It goes by the common name floating marsh marigold.
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- cc-by-sa-3.0
- droit d’auteur
- Wikipedia authors and editors
