Mitreola liui Sp. Nov. (Loganiaceae, Loganioideae), a new species from Chongqing, China

Mitreola liui sp. nov., a new species from Chongqing, China, is described and illustrated. This species is close to M. petiolatoides in morphological characters. Both of them have terete stem, lateral veins 4-6 pairs, stamens 5, inserted at corolla tube base but are distinguished by perennial, leaves blade long elliptic to oblanceolate, apex acute, the flower with narrow-triangular bracts. The key to the species of Mitreola in China is provided.