Curcuma lithophila and C. rufostriata (Zingiberaceae), two new species from Thailand, and additional notes on C. papilionacea

Abstract

Curcuma lithophila and C. rufostriata, two new species from Curcuma subgen. Hitcheniopsis, are described and illustrated. They are compared with their morphologically closest species, Curcuma rhabdota, C. papilionacea and C. sparganiifolia. Notes on distribution, ecology, etymology, uses and IUCN provisional assessments are provided. Further notes on the distribution of the recently described C. papilionacea and an improved IUCN conservation assessment are reported from additional collections.

Curcuma kakchingense (Zingiberaceae), a new species from northeast India

“…The highest diversity of the genus exists in Thailand, with the latest reported 67 species (Saensouk et al 2021b). Recent explorations have resulted in discoveries of many new species from Thailand, China and Vietnam (Boonma and Saensouk 2020, Leong‐Škorničková et al 2020, 2021, Soonthornkalump et al 2020, 2021, 2022, Tanaka et al 2020, Chen et al 2021, Maknoi et al 2021, Saensouk et al 2021a,b2021b,c2021c,d2021d, 2022a,b2021b, Nguyen et al 2022, Rakarcha et al 2022). The numerous recently discovered Curcuma species serve as a good indication of existing gaps in our knowledge of the morphological variability of the genus, particularly in the underexplored Indochinese region (Leong‐Škorničková et al .…”

Curcuma suraponii sp. nov. (Zingiberaceae), a new species of Curcuma subgen. Curcuma from Thailand

“…In contrast, the other two subgenera possess the epigynous glands, namely subgenus Curcuma, typically exhibit well-developed coma bracts and closed bell-shaped flowers, while subgenus Ecomatae generally lacks coma bracts and features open-form flowers, and bracts fused only at the base (Záveská et al 2012;Leong-Škorničková et al 2015). This classification system has been applied to the current taxonomic study of Curcuma in Thailand (e.g., Leong-Škorničková et al 2017Leong-Škorničková et al , 2020Leong-Škorničková et al , 2021Leong-Škorničková et al , 2022Boonma and Saensouk 2019;Maknoi et al 2019;Soonthornkalump et al 2020Soonthornkalump et al , 2021Soonthornkalump et al , 2022Rakarcha et al 2022;Saensouk et al , c, d, e, 2022aand Ruchisansakun and Jenjittikul 2023).…”

Curcuma maxwellii and C. rubroaurantiaca (Zingiberaceae, Zingiberoideae), two new species from Thailand

“…Over 65 species from all three subgenera are present in Thailand ( Leong-Škorničková et al 2021 ), of which more than 20 were described in the last 10 years (e.g. Maknoi et al (2011 , 2019 ); Chen et al (2015) ; Leong-Škorničková et al (2017 , 2020 , 2021 , 2022 ); Boonma and Saensouk (2019) ; Soonthornkalump et al (2020 , 2021 , 2022 ); Saensouk et al (2021) ; Rakarcha et al (2022) ; Ruchisansakun and Jenjittikul (2023) ).…”