1. Grey biennial sticks, and that Arendt profiling fracture. 二年生枝灰色，并可见纫纹纵裂。
2. North American annual or biennial with long soft hairs on the leaves. 北美一年生或两年生植物，叶子上有柔软的长毛。
3. Herbs biennial or perennial, with rhizomes or woody caudex, rarely annuals. 二年生或多年生草本，具根状茎或者木质，很少年刊。
英英解释
n.
1. a plant having a life cycle that normally takes two seasons from germination to death to complete; f
2. occurring every second year
3. having a life cycle lasting two seasons
