Contractile root A specialized root developed by certain bulb-and corm-forming plants that serve to pull the bulb or corm down to the appropriate depth in the soil, e.g. Crocus.

• 收缩根：在某些具有形成鳞茎或球茎的植物中特化的根结构。收缩根的作用是把形成的鳞茎或球茎定位于土壤的某一特定深度，例如番红花属的植物。