Drosera rotundifolia
droséra à feuilles rondes, round-leaf sundew
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.
2–15(–25)-flowered;
scapes 5–35 cm, glabrous.
4–7 mm diam.;
sepals connate basally, oblong, 4–5 × 1.5–2 mm, glabrous;
petals white or pink, spatulate, 5–6 × 3 mm.
5 mm.
light brown, fusiform, 1–1.5 mm, finely and regularly longitudinally striate, with metallic sheen.
= 20.
Drosera rotundifolia
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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