Ephippianthus sawadanus (F.Maek.) Ohwi

Japanese: ハコネラン（英語表記）Ephippianthus sawadanus (F.Maek.) Ohwi

A small terrestrial orchid found rarely on the forest floor in cool temperate zones. The Japanese name is derived from Mt. Hakone, where it was first discovered. The rhizome is elongated and slender. Near the ground surface, it develops a single oval leaf, 1.5-3 cm long. Around June, it produces several sparse flowers at the end of a thin flower stalk, 8-15 cm long. The flowers are pale yellow-green and just under 1 cm in diameter. The lip has fine serrations from the center to the base. There are four waxy pollinia. The pillar has protrusions on both sides. A species endemic to Japan, distributed in the mountains on the Pacific side of Kanto and Kinki, mainly growing on the forest floor of beech zones.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

冷温帯の林床にややまれに見いだされる小型の地生ラン。和名は，最初の発見地，箱根山にちなむ。根茎は細長く伸長する。地表近くに，長さ1.5～3cmの楕円形の葉を1枚展開する。6月ころ，8～15cmの細い花茎の先に，数個の花をまばらにつける。花は淡黄緑色，径1cm弱。唇弁には中央部から基部にかけて細かい鋸歯がある。花粉塊は蠟質で4個。蕊柱（ずいちゆう）には左右に突起がある。日本特産種で，関東，近畿の太平洋側の山地に分布し，おもにブナ帯の林床に生育する。

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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