Morphological observation
The morphological data of the new species were based on living plants and specimens collected in the field, and the vouchers were deposited at the herbaria IBSC and KUN (acronyms according to Thiers 2021), and the morphological data for similar species refer to their protologue (Blume, 1826; Wan, 1983), revised literature (Wallich, 1831; Candolle, 1844), regional flora (Backer & Bakhuizen van den Brink, 1965) or living plants and specimens.