Drosera rotundifolia

Linnaeus

Sp. Pl. 1: 281. 1753.

Common names: Roundleaf sundew droséra à feuilles rondes
Treatment appears in FNA Volume 6. Treatment on page 424. Mentioned on page 421, 422, 423, 425.

Plants forming winter hibernaculae, rosettes (2–) 4–10 (–15) cm diam.; stem base not bulbous-cormose. Leaves erect to prostrate; stipules adnate to petioles their entire length, 4–6 mm, margins fimbriate along distal 1/2; petiole differentiated from blade, 1.5–5 cm, glandular-pilose; blade suborbiculate, 0.4–1 cm × 5–12 mm, broader than long, much shorter than petiole. Inflorescences 2–15 (–25) -flowered; scapes 5–35 cm, glabrous. Flowers 4–7 mm diam.; sepals connate basally, oblong, 4–5 × 1.5–2 mm, glabrous; petals white or pink, spatulate, 5–6 × 3 mm. Capsules 5 mm. Seeds light-brown, fusiform, 1–1.5 mm, finely and regularly longitudinally striate, with metallic sheen. 2n = 20.


Phenology: Flowering Jun–Sep.
Habitat: Sphagnum bogs, fens, beaver ponds, swamps, peaty gravels, sandy soil, wet sand (for example, disturbed bottoms of old sand pits, emergent sandy shorelines) in the North, lake and stream margins, sphagnous streamheads, and seeps in the South
Elevation: 0–3000 m

Distribution

V6 802-distribution-map.jpg

Greenland, St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Calif., Colo., Conn., Del., D.C., Ga., Idaho, Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Miss., Mont., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wis., Eurasia, Pacific Islands (New Guinea)

Discussion

Drosera rotundifolia was the carnivorous plant most studied by C. Darwin (1875). The species is circumboreal and is widespread across North America, much more common northward and rarer in the South. It is difficult to grow in warmer climates.

M. L. Fernald (1950) recognized forma breviscapa (Regel) Domin, found in the Canadian Maritime Provinces, with scapes 1–4 cm long and 1–3 flowers, and var. comosa Fernald, found from Gaspé County, Quebec, to New England and northern New York, with the parts of the flowers modified to green gland-bearing leaves. Dwarf, few-leaved plants found in Alaska have been called var. gracilis Laested.

Selected References

None.

Lower Taxa

None.
... more about "Drosera rotundifolia"
T. Lawrence Mellichamp +
Linnaeus +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
suborbiculate +
circinate +  and infolded +
broader than long , much shorter than petiole;5mm;12mm +
overwintering +
5 cm50 mm <br />0.05 m <br /> (?) +
Roundleaf sundew +  and droséra à feuilles rondes +
multiflowered +
umbel-like +
Greenland +, St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mont. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Eurasia +  and Pacific Islands (New Guinea) +
0–3000 m +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Sphagnum bogs, fens, beaver ponds, swamps, peaty gravels, sandy soil, wet sand (for example, disturbed bottoms of old sand pits, emergent sandy shorelines) in the North, lake and stream margins, sphagnous streamheads, and seeps in the South +
multicelled +  and mucilage-tipped +
2-15(-25)-flowered +
petiolate +, estipulate +  and stipulate +
fimbriate +
Pink (?) +  and White (?) +
distinct +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
3 cm30 mm <br />0.03 m <br /> (?) +
glandular-pilose +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
differentiated +
Flowering Jun–Sep. +
3-5-carpellate +  and compound +
5 cm50 mm <br />0.05 m <br /> (35 cm350 mm <br />0.35 m <br />) +
20 +  and 70 +
fusiform +
minute +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not bulbous-cormose +
0 cm0 mm <br />0 m <br /> (8 cm80 mm <br />0.08 m <br />) +
capitate +  and plumose +
0.4 cm4 mm <br />0.004 m <br /> (?) +  and 0.6 cm6 mm <br />0.006 m <br /> (?) +
greener in shade +
cuneate +, obovate +, spatulate +, orbiculate +, suborbiculate +  and unlobed +
Drosera rotundifolia +
species +
jawlike +
rose +  and pinkish lavender +
deciduous +, perennial +  and annual +