Nopporncharoenkul, N., Eakjamnong, W., Somnoo, T. and Punchay, K. 2026. Taxonomic treatment of nyctanthous species of Kaempferia subgen. Protanthium (Zingiberaceae), with two new infraspecific taxa endemic to Thailand. The Thailand Natural History Museum Journal. 20, 2 (Jul. 2026), 137–171.