一、形态特征半夏为天南星科多年生草本植物,株高15~40厘米。地下块茎球形或扁球形,直径0.5~4厘米,芽基部着多数须根,底部与下半部呈淡黄色、光滑,部分连年作种的大块茎周边常联生数个小块状侧芽。叶基生具长柄,1年生或较小珠芽长出的叶为卵状心形单叶,2年生以上为3小复叶,小叶片 First, morphological characteristics Pinellia ternata Branch perennial herb, plant height of 15 to 40 cm. Underground tubers spherical or oblate, 0.5 to 4 cm in diameter, the bud base with the majority of fibrous roots at the bottom and the bottom was pale yellow, smooth, part of the continuous planting of large tubers around the periphery often several small pieces of lateral bud. Leafy with long-handled, 1-year-old or smaller buds grow out of the egg-shaped heart-shaped single leaf, 2-year-old for more than 3 small leaves,