Gastrodia pubilabiata f. castanea
(Japanese name:Bengarayatsushiroran) is described as a new form
of Gastrodia pubilabiata in 1979 (Fukunaga,H.,et al.).
Taxonomic characteristics: With the original species, flowers are
black-, or purple-brown, while in the new form, the flowers are
red-brown. The other differences between the two can't be observed.
Bloom time: September-October.