Trifolium campestre (hop trefoil, "Kusudamatsumekusa")

Japanese name: クスダマツメクサ （薬玉詰草）
Scientific name: Trifolium campestre

[Overview]
An annual 50 cm tall, found on riverbeds and vacant lots.
The stems branch well and extend in a zigzag.
The leaves are alternate and consist of 3 leaflets; the leaflets are elliptical, 0.4–1 cm long, with low serrations on the upper margin.
From the leaf axils, globose racemes about 2 cm long are produced, bearing 20–50 yellow papilionaceous flowers 5 mm long.
The fruit is a legume.

[History]
It was discovered in Yokohama in 1943 and is now seen in various places.

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