Abstract. Saensouk S, Boonma T, Saensouk P. 2021. Six new species and a new record of Curcuma L. (Zingiberaceae) from Thailand. Biodiversitas 22: 1658-1685. All six new species and a new record of Curcumawere described with detailed illustrations, photographs, summaries for their distribution, ecology, IUCN conservation status, and followed by a new record and key to 63 species of Curcuma revised and present in Thailand. The study surveyed six new species and a new record of Curcuma to collect, describe, measure, and illustrate the living and spirit specimens under a stereoscopic microscope. Plant materials and photographs were collected in the field from 2018 to 2019. The results of the study described six new species, including Curcuma chantaranothaii Boonma & Saensouk sp. nov., C. charanii Boonma & Saensouk sp. nov., C. rangsimae Boonma & Saensouk sp. nov., C. phrayawan Boonma & Saensouk sp. nov., C. puangpeniae Boonma & Saensouk sp. nov., C. purpurata Boonma & Saensouk sp. nov., and a first new record of C. peramoena. All six new species were recognized to be endemic to Thailand.

Abstract. Saensouk P, Saensouk S. 2021. Diversity and cytological studies on the genus Amomum Roxb. former Elettariopsis Baker (Zingiberaceae) in Thailand. Biodiversitas 22: 3209-3218. A comprehensive diversity and cytological studies of the genus Amomum Roxb. in Thailand have not been reported. This work aims to study the diversity and cytological including chromosome numbers and karyotypes of the genus Amomum Roxb. former Elettariopsis Bakerin Thailand. Ten species of Amomum were recognized from Thailand. Nomenclatures, vernacular names, distribution, ecology, and traditional utilization are provided. Only Amomum wandokthong is widely cultivated in all parts in Thailand. Four living species, i.e. Amomum curtisii, A. monophyllum, A. trilobum, and A. wandokthong have been collected from field trips. Therefore, the somatic chromosome numbers from four species of this genus were studied from root tips. The somatic chromosome numbers of each species in this study were counted from 20 cells. The karyotype formulas were derived from measurements of the metaphase chromosomes in photomicrographs. The chromosome numbers of four species were found to be 2n = 48. Karyotypes of four species were reported to be Amomum curtisii (32m + 8sm + 8st), A. monophyllum (26m + 12sm + 10st), A. trilobum (18m + 24sm + 6st), and A. wandokthong (28m + 16sm + 4st with five visible satellites chromosomes). The chromosome numbers of A. monophyllum and A. wandokthong were reported for the first time. The karyotypes of four species were studied for the first time.

Abstract. Saensouk P, Saensouk S. 2021. Short Communication: Taxonomy and the first report for pollen and leaf surfaces anatomy of the genus Enkleia (Thymelaeaceae) in Thailand. Biodiversitas 22: 1340-1344. Taxonomic of the genus Enkleia in Thailand are revised. Two species, Enkleia malaccensis Griff. and E. thorelii (Lecomte) Nevling, are reported. Enkleia siamensis (Kurz) Nevling and E. siamensis (Kurz) Nevling subsp. andamanica (Hutch. Ex C. E. Parkinson) Nevling are reduced to Enkleia malaccensis Griff.. Therefore, both species are recorded as synonym of E. malaccensis. E. thorelii is reported endemic to Thailand. Vernacular name, distribution data, ecological data, flowering period, fruiting period, conservation status, traditional use of this genus are provided. The pollen and leaf surfaces of the genus are examined and the first studied.