一年生的

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

草沼生或水生，多生植物或在不利状况下为生草。

The kind of plant is a hardy annual.

种植物是耐寒生植物。

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

要菟丝子是苜蓿田中最常见生寄生性恶性杂草，是世界性杂草检疫对象。