6. Drosera linearis Goldie, Edinburgh Philos. J. 6: 325. 1822.
Linear-leaved sundew, droséra à feuilles linéares Linear-leaved sundew, droséra à feuilles linéares
Plants forming winter hibernaculae; rosettes 6–15 cm diam.; stem base not bulbous-cormose. Leaves erect; stipules adnate to petioles their entire length, 5 mm, margins fimbriate; petiole differentiated from blade, <flattened>, 3–7 cm, glabrous; blade linear, 1–6 cm × 1.5–3 mm. Inflorescences 1–8-flowered; scapes 2–15 cm, glabrous. Flowers 6–8 mm diam.; sepals connate basally, oblong-elliptic, 4–5 × 2 mm, minutely glandular-denticulate; petals white, obovate, 6 × 3–4 mm. Capsules 4–5 mm. Seeds black, rhomboidal or oblong-obovoid, 0.5–0.8 mm, densely, irregularly crateriform. 2n = 20.
Flowering Jun–Aug. Marl fens, wet, limey shores, often in a centimeter of water; 10–400 m; Alta., B.C., Man., Nfld. and Labr. (Nfld.), N.W.T., Ont., Que., Sask.; Maine, Mich., Minn., Mont., Wis.
Drosera linearis is especially frequent on marly shores and fens of the western Great Lakes in Michigan. There, it is often found with D. anglica and D. rotundifolia. Drosera linearis is usually found on open marl, D. rotundifolia on sphagnum hummocks, and D. anglica more often around bases of hummocks and on fen margins (D. E. Schnell 2002). This is perhaps the most difficult species to maintain in cultivation, especially in warmer climates.