The dodder is one kind of annual autoecious weed of alfalfa, cosmopolitan weed quarantine object.

摘要菟丝子是苜蓿田中最常年寄性恶性杂草，是世界性杂草检疫对象。

Herbs paludose or aquatic, perennial or under unfavorable conditions annual.

草本沼或水，多年植物或在不利状况下为年草本。

The kind of plant is a hardy annual.

这种植物是耐年植物。