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Iris ensata Thunb.
Iris kaempferi Sieb. ex Lem.
Rhizomatous plant 60-90 cm. Leaves sword-shaped, with prominent midrib, 1.0-1.5 cm broad. Stem shorter than leaves. Flowers 2-4, large, dark purple or violet, terminal. V - May to October. Fl - June-July. Fr - September. P - by seed and division. Known from Japan as an ancestor of the numerous cultivars of Japanese irises. Z 5 (4).
Siberia (southern regions), Far East, northeastern China, Korea and Japan. Moist meadow slopes, fluvial plains with rich lime-free soil.
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