【摘要】 绞股蓝为多年生攀援草质藤本。主根早期夭折,根系由不定根组成,根的初生木质束为2～4原型,次生结构可有次生皮层发生。攀援茎纤细,冬季枯萎,具五稜,周维纤维连成一环,维管束2圈,外圈5个,内圈4或5个,其中2个较大;匍匐于地面的茎,越冬不死,变成多年生,逐步增粗,周维纤维断裂,维管束排成不规则的1圈。叶乌足状,5～7小叶;气孔器为王冠型,副卫细胞多为4～5个;栅栏、海棉组织分化明显,稀不明显。雌雄异株,圆锥花序,花小,浆果球形。更多还原

【Abstract】 Gynostemma pentaphyllum is a perennial climbing vine. Its tap root fails develop early,and the root system is composed by adventitious roots, the xylem arms of the primary structure of the root are 2-5 arches, secondary structure may develop secondary cortex.Its climbing stem is fine, and died down at the winter frost, while the parts of prostrating on the soil, covering with withe leaves, still survived and became perennial. The primary structure of the roof is a continuous ring of firous cells tha is perivascular fiber, 2 rings of vascular bundles, the outer ring 5 in number, and the inner 4-5, among them 2 are larger, and when the stem is getting older, which perivascular fiber will discontinuous and the vascular bundle become one ring. Compound leaf is palmate,leaflet 5-7, which palisade and sponge tissue distinguish clearly, rare not clear. Stomata are stephanocytic type, surrounded by 4-6 subsidiary cells which weakly differentiated, forming a more or less distinct rosette. Plant dioecious, inflorescence panicle, flower small, berry orbicular.更多还原