Gastrodia elata Bl. f. cyaneum L. B. Lin: A new form of Gastrodia (Orchidaceae) in Yunnan

[Objective] Gastrodia elata Bl. f. cyaneum L. B. Lin represents a newly identified form of Gastrodia originated from Xiaocaoba Town of Zhaotong in Yunnan, providing comprehensive documentation of morphological characteristics with color photographs. [Methods] The aim was to identify G. elata f. cyaneum as a novel form by meticulous dissection, morphological examination, and comparative analysis with established specimens and literatures. [Results] Distinguished features that set G. elata f. cyaneum apart include an inverted egg-shaped tuber, the protruding, long, gray-green terminal bud, and the clear blue color of the floral axis, flowers, and capsules. [Conclusion] This research identify G. elata f. cyaneum as a novel form, which not only enriches the diversity of orchids, but also presents valuable resources for the breeding of G. elata.