番薯属是开花植物旋花科中最大的属。
Ipomoea is the largest genus in the flowering plant family Convolvulaceae.
旋花：任一种分布广泛的旋花属的通常为蔓生或对生的植物，开有漏斗状花朵，包括几种野草和几种作为观赏植物栽培的植物。
Convolvulus: any of various mostly trailing or twining plants of the widespread genus convolvulus having funnel-shaped flowers and including several weeds and a few grown as ornamentals.
土木香大型粗糙的植物(土木香旋覆花属)，原产于中亚，花黄色，头状花序呈辐射状向四周延伸，根入药。
A tall, coarse plant (Inula helenium) native to central Asia, having rayed yellow flower heads. The roots are used medicinally.
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