Dro'sera rotundifo'lia, or D. An'glica and D. Lonifo'lia, Drosera, Sundew, N.F. -- Droseraceae. The air-dried flowering plant of the former, frequently mixed with the two latter closely allied species, or at times wholly replaced by them with not more than 5 p.c. of foreign matter, yielding not more than 10 p.c. of acid-insoluble ash; N. Temperate zone, N. America. Small moss-like plant, glittering in sunshine when covered with dew. Matted or broken leaves, stems and fibrous black rootlets, reddish throughout; leaves mostly basal, petiolate; blade orbicular, 15 Mm. (3/5') broad, reddish glandular tentacles above, scape filiform, smooth, 10-30 Cm. (4-12') long, few 5-parted, small white fugacious flowers, raceme. D. Anglica -- leaves linear, obovate, glabrous or sparsely hairy petioles; D. Longi'folia -- leaves spatulate, blades 2-3 times longer than broad, petioles and scape smooth; odorless; taste faintly bitter, acidulous. Powder, reddish-brown -- oval-headed tentacles, few glandular hairs, stomata, fibro-vascular bundles, tracheae, parenchyma containing reddish substance, few starch grains; solvent: 67 p.c. alcohol; contains resin (acrid, odorous, greenish-brown), glucose, citric, malic acid, ferments (converts albumin into peptone), ash 30 p.c. Stimulant, expectorant; cronic bronchitis, whooping cough, tuberculosis -- of doubtful efficacy. Dose, 3ss-1 (2-4 Gm.); 1. Fluidextractum Droserae (67 p.c. alcohol). Tincture 10 p.c.