Burmannia championii Thwaites

Family: Burmanniaceae
Japanese: ヒナノシャクジョウ (雛の錫杖) [Hinanoshakujō]

This is a small mycoheterotroph that pops up in damp, dim areas of the forest floor in late summer. There's just something really mysterious about plants that aren't green. Thanks to Mitsuhashi-san for helping me learn to find these. In late July or August, the buds open one at a time, for only a few hours each, so if you spot one (in Shiratani Unsuikyo, or along the train tracks to Jomon Sugi or elsewhere) in bloom, congratulations!

References:
Tropicos.org. Missouri Botanical Garden. http://www.tropicos.org/Name/4600129 (04 Sep 2014)
米倉浩司・梶田忠 (2003-)　「BG Plants 和名－学名インデックス」（YList），http://ylist.info（ 2019年8月14日）