Abstract
Zingiber baumii Chatan & Promprom, a new species from the Zingiberaceae family, is described from Sakon Nakhon Province in northeastern Thailand. This species was identified during field expeditions conducted between 2018 and 2024 in Phu Pha Yol National Park. The morphological characteristics of Z. baumii, such as red or pinkish-red leaf sheaths, leaf blades (1.5-) 2.0-3.0 cm wide, pink petioles, and bright yellow corolla with a red patch, distinguish it from closely related species such as Z. isanense Triboun & K. Larsen. Zingiber baumii grows in slightly shaded dry dipterocarp forests at elevations of 300-380 m. The preliminary conservation assessment indicates that this species should be classified as Endangered (EN) according to IUCN criteria due to its limited distribution and small population size. Detailed morphological comparisons with related species are provided, along with illustrations and habitat descriptions.
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