This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Drosera longifolia Michx. Fl. Bor. Am. 1: 186. 1803. Not L. 1753.
Drosera intermedia var. Americana DC. Prodr. 1: 318. 1824.
Rootstock elongated (2'-4' long when growing in water). Scape erect, glabrous, 2'-8' high. Blades of the leaves ascending, spatulate, obtuse at the apex, 3"-7" long, 1 1/2"-2" wide, their upper surfaces clothed with glandular hairs, gradually narrowed into a glabrous petiole 1/2'-1 1/2' long; raceme 1-sided; flowers several; pedicels about 1 1/2" long; petals white, slightly exceeding the sepals; seeds oblong, the testa close, roughened.
In bogs, Newfoundland to Saskatchewan, south to Florida and Louisiana. Also in Cuba, and in northern Europe. June-Aug.
Drosera longifolia L. Sp. Pl. 282. 1753.
Drosera anglica Huds. Fl. Angl. Ed. 2, 135. 1778.
Similar to the preceding species, but the leaf-blade is erect, longer (8"-15" long, 1 1/2"-2" wide), elongated-spatulate and narrowed into a glabrous or sparingly hairy petiole 1'-4' long; pedicels 1/2"-3" long; flowers usually several, racemose, white, 2"-2i" broad, rarely only one; seeds oblong, obtuse at both ends, the testa loose.
Drosera linearis Goldie, Edinb. Phil. Journ. 6: 325. 1822.
Scape low but sometimes exceeding the leaves, glabrous. Petioles erect, glabrous, 2'-4' long; blade linear, ą-3' long, about 1" wide, densely clothed with glandular hairs, obtuse at the apex; flowers few, or solitary, white; petals somewhat exceeding the sepals; seeds oblong, black, the testa close, smooth and somewhat shining.
In bogs, Quebec to Ontario, Alberta, Maine, Wisconsin and Minnesota. Blooms a little later than D. rotundifolia when the two grow together.
Drosera filiformis Raf. Med. Rep. (II.) 5: 360. 1808.
Drosera tenuifolia Willd. Enum. 340. 1809.
Scape erect, glabrous, 8'-2o' high. Leaves narrowly linear or filiform, glandular-pubescent throughout, 6'-15' long, about 1" wide, usually acutish at the apex, with no distinction between blade and petiole, woolly with brown hairs at the very base; racemes 1-sided, 10-30-flowered; pedicels 2"-4" long; flowers purple, 4"-12" broad; petals obovate, much exceeding the sepals; seeds fusiform, acute at each end, the testa minutely punctate.
Drosera brevif˛lia Pursh, a species of the southeastern United States, with cuneate-obovate leaves and glandular-pubescent scapes, enters our territory in extreme southeastern Virginia.