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蓼大青叶为蓼科植物蓼蓝的干燥叶。夏、秋二季枝叶茂盛时采收两次,除去茎枝及杂质,干燥。以叶厚、色蓝绿者为佳。蓼大青叶原植物蓼蓝,穗状花序顶生或腋生,排列紧密;花小,花被5裂,裂片倒卵形,淡红色;雄蕊6至8;雌蕊1,柱头3歧。瘦果椭圆状三棱形,褐色,有光泽,包于宿存花被内,花期7至9月,果期8至10月。多为栽培。干燥后的蓼大青叶多皱缩、破碎,完整者展平后呈椭圆形,长3至8cm,宽2至5cm。蓝绿色或黑蓝色,先端钝,基部渐狭,
Polygonum leaves for Polygonaceae Polygonatum dry leaves. Harvested in summer and autumn, two branches of lush, remove stems and impurities, dry. To thick leaves, color blue green is better. Polygonum Folium Polygonum, spikes terminal or axillary, arranged in close; flowers small, perianth 5 crack, lobes obovate, reddish; stamens 6 to 8; pistil 1, stigma 3 disagree. Achene oblong prism, brown, shiny, enclosed in persistent perianth, flowering from July to September, the fruit from August to October. Mostly for cultivation. After drying Polygonum folium more froward, broken, complete flattened oval, length 3 to 8cm, width 2 to 5cm. Blue-green or black-blue, apex obtuse, base attenuate,