Nervilia

...A small terrestrial orchid that rarely grows on the forest floor of evergreen forests. It is characterized by the fact that the leaves and flowers appear at different times. The Japanese name is a reference to the corm, which resembles the bulbil of the Japanese yam, and the leaves, which resemble those of the Asparagus orchid. It has a small corm. From May to July, a single flower appears on a flower stalk about 10 cm long. The leaves appear after the flower blooms. There is only one leaf, which is folded up like a fan inside the bud. When it opens, the petiole is long and the leaf blade is pentagonal-cordate, which is quite different from the leaves of normal orchids. The flowers are brown and do not open much, and are about 1 cm in diameter. ...

*Some of the terminology that mentions "Nervilia" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…常緑樹林の林床にまれに生える小型の地生ラン。葉と花が別々の時期に出るのが特徴。和名は球茎をヤマノイモのむかご(珠芽)，葉をウスバサイシン類になぞらえたもの。小さな球茎がある。5～7月，10cmくらいの花茎に花を1個つける。葉は花後に出る。葉はただ1枚のみ，芽の中では扇のようにたたみこまれており，それが開くと葉柄は長く，葉身は五角形状心形となり，通常のランの葉とはかなり異なる。花は茶褐色であまり開かず，径1cm程度。…

※「Nervilia」について言及している用語解説の一部を掲載しています。

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