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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. [ABSTRACT FROM AUTHOR]

A new subspecies, Ardisia crenata Sims subsp. mukdahanensis Chatan & Promprom (Primulaceae), is described from Mukdahan Province, Thailand. This discovery was made during field studies conducted from 2021 to 2023, during which the authors collected and analysed specimens, comparing them with relevant taxonomic literature and herbarium collections. A. crenata subsp. mukdahanensis is distinct from its closest relative, A. crenata subsp. crassinervosa by a combination of morphological traits, such as moderately dense minute hairs on young shoots, abaxial side of young lamina and calyx, peduncles and pedicels; larger flowers (7.0–7.5 mm) that are pure white or pinkish; larger fruits (7–8 mm) and absence of glandular punctation in organs such as lamina, calyx, corolla, anther and fruit. This new subspecies grows in slightly dense dry evergreen forests or open areas near streams and is preliminarily assigned to the Data Deficient (DD) category according to IUCN guidelines. [ABSTRACT FROM AUTHOR]

Acilepis nakhonphanomensis Chatan & Promprom, a new species in the Sunflower family (Asteraceae) from northeastern Thailand, is described and illustrated. It mainly differs from other previously known similar Acilepis species by the receptacle, leaf blade margin, involucre, floret, corolla tube, anther, style, and achene. Colour illustrations, line drawings, distribution map, and morphological comparisons with its allied species are provided. The conservation status of the new species was also assessed. [ABSTRACT FROM AUTHOR]

Stemona namkhunensis Chatan & Promprom, a new species from the East of Thailand, is described and illustrated. It is morphologically similar to S. collinsiae Craib but clearly differs in the characteristic of the petiole, lamina, tepal, stamen, pistil, simple and pedunculated flower, and lacking bract. A morphological description, distribution, ecology, etymology, vernacular name, preliminary conservation status, and photographs are provided. A key to species of the erect species in Thailand is presented. [ABSTRACT FROM AUTHOR]

Objectives: This research was carried out for describing, illustrating and treating a new medicinal plant variety in the genus Trichosanthes. Methods: This research was carried out by collecting plant specimens in the Northeastern Thailand. Morphological characters were studied and compared with the closely related taxon and taxonomic literatures. Results: T. tricuspidata subsp. rotundata var. longirachis, was found. This plant is described and illustrated here and treated as a new variety. It differs from the other of T. tricuspidata subsp. rotundata by having the following combination characters: Comparatively stout herbaceous climber up to 20 m long, tendril 3-5-brached, probract obovate with obvious glands, mature blade unlobed or 3-shallowly lobed with 1-2 short angles, blade not deeply lobed (unlobed blade found in juvenile plants), blade size 5-11 cm diameter and raceme rachis length 10-130 cm. Its fruits and seeds were used as medicinal parts. Conclusion: Totally, three subspecies and four variety of T. tricuspidata in Thailand have been recorded so far. Important comparative morphological characters with some closely related variety are discussed. The local people used it as medicinal plant. [ABSTRACT FROM AUTHOR]