Myrmechis japonica

Family Orchidaceae
Subfamily Spiranthoideae
Tribe Cranichideae
Subtribe Goodyerinae
Scientific name Myrmechis japonica (Reichenbach f.) Rolfe
Synonyms Rhamphidia japonica Reichenbach f.
Common name (Japanese common name) aridoushi-ran [turu-aridoushi like orchid (turu-aridoushi = Mitchella undulata Siebold & Zuccarini)]
(English common name) none
Distribution (Japan) Hokkaido, Honshu (north of Kinki region), Shikoku
(Other nations) Russia (Far East), Korea, China
Habitat Mountane forest.
Chromosomal number 2n=56
Description Plants electing 3-8cm tall. Leaves 4-12mm long, 3-8mm wide, petioles 5-10mm long. Flowers 1 or 2 at top, white, calyx lobes 6-7mm long, labium ca. 2.5mm long (upper surface), longer than calyx lobes, flowering in July to August. Terrestrial. Perennial plants.
Note Myrmechis japonica (Reichenbach f.) Rolfe often occurs near Mitchella undulata Siebold & Zuccarini (Rubiaceae). Both flowers are small and very similar to each other. Due to these, it is relatively difficult to find native Myrmechis japonica in the dark forest.
Myrmechis japonica (Reichenbach f.) Rolfe var. tsukusiana Masamune occurs in Shikoku (Mt. Tsurugi) and Kyushu (Yakushima Island) of Japan. Label is shorter than calyx lobes.
Myrmechis japonica (Reichenbach f.) Rolfe var. sasakii (Yamamoto) S.S. Ying occurs in Taiwan. Yellow flowers.

Photo by Madame Popow Photo by Madame Popow
August 2008
at mountane forest
August 2008
at mountane forest