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

Abstract

Curcuma maxwellii sp. nov. and Curcuma rubroaurantiaca sp. nov. (Zingiberaceae, Zingiberoideae, Zingibereae), two new red-orange-flowered species from Thailand, are described. They are compared to the morphologically closest species from the Curcuma subgen. Ecomatae and detailed descriptions, colour plates and information on their distribution, ecology, phenology and uses are provided. Preliminary IUCN conservation assessments for both of these species are proposed as Least Concern