Oleandra

Japanese: ツルシダ（英語表記）Oleandra

A perennial, evergreen herb of the family Vulgaris, closely related to the ball fern, but also resembling low shrubs at first glance. Some species have creeping roots, but those that grow upright are hard, form low clumps, and are covered with densely compressed scales. The leaves, which grow at joints on the rhizome, are sparsely arranged or in evenly spaced clusters, simple, entire, often narrowly elliptical, with pointed tips, and papery to leathery. The veins are free and run parallel to the leaf margin. The sporangia are located above the veins, often close to the midrib.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

タマシダに近縁なシダ類であるが，一見，低い灌木に似た種もあるツルシダ科の多年生，常緑草本。根は地上をはうものもあるが，直立するものでは質は硬く，低いやぶをつくり，密に圧着した鱗片によっておおわれる。根茎に関節をつくって出る葉はまばらにつくか，等間隔に房状につき，単葉で，全縁，多くは狭楕円形で，先端はとがり，紙質から革質。葉脈は遊離脈で，平行して葉縁に走る。胞子囊群は葉脈の上につき，しばしば中肋に近接する。

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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