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天冬为百合科植物天冬的干燥块根。秋、冬季采挖,洗净,除去茎基和须根,置沸水中煮或蒸至透心,趁热除去外皮,洗净,干燥。药材性状本品呈长纺锤形,略弯曲,长5至18cm,直径0.5至2cm。表面黄白色至淡黄棕色,半透明,光滑或具深浅不等的纵皱纹,偶有残存的灰棕色外皮。质硬或柔润,有黏性,断面角质样,中柱黄白色。气微,味甜、微苦。质量以条粗壮、色黄白、半透明者为佳。性味天冬性寒,味甘,苦。归肺、肾经。
Asparagus for the lily family asparagus dry roots. Autumn and winter excavation, wash, remove the stem base and fibrous roots, boiled or boiled in water to the heart, remove the skin while hot, washed and dried. Medicinal traits This product is long spindle shape, slightly curved, 5 to 18 cm long, 0.5 to 2 cm in diameter. Surface yellowish white to light yellow brown, translucent, smooth or with varying depths wrinkles, occasional remaining gray-brown skin. Hard or soft, sticky, cross-section horny, the column yellow-white. Gas micro, sweet, slightly bitter. Sturdy quality, color yellow and white, translucent better. Taste winter cold, sweet, bitter. To the lungs, kidney.