Caltha natans

Pallas

Reise 3: 284. 1776

Selected by author to be illustrated
Treatment appears in FNA Volume 3.
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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. 2n=16, 32.

Phenology: Flowering late spring–summer (Jun–Aug).
Habitat: Floating or on moist mud, ponds, lakes, slow-moving rivers and streams
Elevation: 25-1500 m

Distribution

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Alta., B.C., Man., N.W.T., Ont., Sask., Yukon, Alaska, Minn., Wis., Eurasia.

Discussion

Unlike the other species of Caltha in North America, C. natans is relatively invariable morphologically and has not been divided into segregate taxa.

References

None.

Lower Taxa

No lower taxa listed.