noun
hop trefoil; low hop clover
A species of clover (Trifolium campestre) with small yellow flower heads that resemble hop clusters.
道端にクスダマツメクサが咲いていた。
Hop trefoil was blooming by the roadside.
The name クスダマツメクサ literally means 'medicine-ball clover', likely from the resemblance of its flower heads to traditional Japanese medicine balls (kusudama).