Caltha

Linnaeus

Sp. Pl. 1: 558. 175.

,

Gen. Pl. ed. 5, 244. 1754.

Common names: Marsh-marigold populage
Etymology: Greek name for some yellow-flowered plants
Treatment appears in FNA Volume 3.

Herbs, perennial, from thick caudices 0.5-2 cm or slender stolons. Leaves basal and cauline, simple; proximal leaves petiolate, distal leaves sessile or nearly so; cauline leaves alternate. Leaf-blade unlobed, oblong-ovate to orbiculate-reniform or cordate, margins entire, dentate, or crenate. Inflorescences terminal or axillary, 1-6-flowered cymes or flowers solitary, to 22 cm; bracts leaflike, not forming involucre. Flowers bisexual, radially symmetric; sepals not persistent in fruit, 5-12, white, pinkish, yellow, or orange, plane, oval-orbiculate to narrowly obovate, 4-23 mm; petals absent; stamens 10-40; filaments filiform; staminodes absent between stamens and pistils; pistils 5-55, simple; ovules 15-35 per pistil; style 0.1-2 mm. Fruits follicles, aggregate, sessile or stipitate, linear-oblong to ellipsoid, sides prominently veined or not; beak terminal, straight or weakly curved, 0.2-2 mm. Seeds brown, elliptic to broadly elliptic, rugulose. x=8.

Distribution

Primarily temperate wetlands, worldwide

Discussion

Species 10 (3 in the flora).

Selected References

None.

Key

1 Stems leafless, or with 1 leaf; sepals white to yellow, not orange or pinkish. Caltha leptosepala
1 Stems leafy; sepals white, yellow, or orange, or pinkish. > 2
2 Stems creeping or floating, rooting at nodes; sepals white or pinkish, 4–7(–8) mm; follicles 20–55, bodies 3.2–6.5 mm; seeds 0.5–0.8 mm. Caltha natans
2 Stems erect, or sprawling with age and then producing shoots and roots at nodes; sepals yellow or orange, (6–)10–25 mm; follicles 5–15(–25), bodies 8–15 mm; seeds 1.5–2.5 mm. Caltha palustris

"thick" is not a number.

... more about "Caltha"
Bruce A. Ford +
Linnaeus +
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 />) +
globose;cylindric +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Marsh-marigold +  and populage +
1-6-flowered +
0 cm0 mm <br />0 m <br /> (22 cm220 mm <br />0.22 m <br />) +
nearly +  and sessile +
Primarily temperate wetlands +  and worldwide +
Greek name for some yellow-flowered plants +
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 +
axillary +  and terminal +
whorled +, opposite +  and alternate +
cauline +  and basal +
palmate +  and pinnate +
crenate;dentate;crenate;dentate +
distinct +
conspicuous +
reduced +
5 +  and 55 +
Sp. Pl. +  and Gen. Pl. ed. +
not arillate +  and stalked +
elliptic +  and broadly elliptic +
rugulose +
orange;yellow;orange;yellow;pinkish;white +
not persistent +
distinct +
3 +  and 6 +
oval-orbiculate +  and narrowly obovate +
0.4 cm4 mm <br />0.004 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
not +  and veined +
persistent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Ranunculaceae +
herbaceous +  and woody +