Caltha natans

Pallas

Reise 3: 284. 1776.

Illustrated
Treatment appears in FNA Volume 3.

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

V3 661-distribution-map.gif

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.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Caltha natans"
Bruce A. Ford +
Pallas +
cuneate +, truncate +  and cordate +
curved +  and straight +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
cordate;ovate-reniform +
largest +
1cm;5cm +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
globose;cylindric +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1-6-flowered +
0 cm0 mm <br />0 m <br /> (22 cm220 mm <br />0.22 m <br />) +
nearly +  and sessile +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Sask. +, Yukon +, Alaska +, Minn. +, Wis. +  and Eurasia +
25-1500 m +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
showy +  and inconspicuous +
0 cm0 mm <br />0 m <br /> (22 cm220 mm <br />0.22 m <br />) +
stipitate +, sessile +  and aggregate +
linear-oblong +  and ellipsoid +
Floating or on moist mud, ponds, lakes, slow-moving rivers and streams +
axillary +  and terminal +
whorled +, opposite +  and alternate +
cauline +  and basal +
palmate +  and pinnate +
crenate;dentate;crenate;dentate +
distinct +
conspicuous +
reduced +
Flowering late spring–summer (Jun–Aug). +
5 +  and 55 +
not arillate +  and stalked +
rugulose +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
pinkish;white +
not persistent +
distinct +
3 +  and 6 +
oval-orbiculate +  and narrowly obovate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not +  and veined +
Illustrated +
rooting +  and leafy +
creeping +  and floating +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
persistent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
Caltha natans +
species +
herbaceous +  and woody +