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Roscoea (named after Wm. Roscoe, 1753-1831). Zingiberaceae. Half-hardy perennial herbs often grown in the warmhouse, but also used for border planting.
Roots thick, fleshy, and fascicled: lvs. lanceolate or oblong: infl. in terminal spikes; bracts persistent, 1-fld.; fls. purple, blue, or yellow; calyx long, tubular, slit down one side; corolla-tube slender, lateral segms. spreading, upper broad, cucullate, erect; lateral staminoides oblanceolate, petaloid, erect, lip large, cuneate, deflexed, 2-cleft or emarginate; ovary 3-celled: caps, cylindric or clavate.—About 15 species, Himalaya region and China. Monographed by Schumann in Engler's Pflanzenreich, hft. 20 (vol. IV:46). Roscoeas thrive in light turfy loam and are prop. by division. R. purpurea is the species best known in cultivation.
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