A delicate annual weed of the Logaceae family (illustration). It grows in slightly damp places on roadsides and in fields. The stem is erect, 5-20 cm tall, thin, and branches out from the axils of the leaves that are clustered at the bottom. The leaves are opposite, oblong to elliptical, 5-20 mm long, and usually have three veins. The flowers are borne at the end of thin pedicels and have a white corolla with four lobes and a calyx with four lobes and pointed lobes at the ends. The calyx is persistent. The fruit, about 1.5 mm in diameter, retains the style even when ripe, and the base of the style splits open to release small seeds. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
マチン科の繊細な一年生雑草(イラスト)。路傍や野原の少し湿った場所に生育する。茎は直立し,高さ5~20cm,細く,下部に集まってつく葉の葉腋(ようえき)から枝を出す。葉は対生し,長卵形から楕円形で長さ5~20mm,通常3脈がある。花は細い花梗の先につき,白色で4裂する花冠と,4裂し,その裂片の先がとがる萼を有する。萼は宿存する。直径約1.5mmの実は,熟しても花柱が残っていて,その基部が裂開して,小さな種子を放出する。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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