Lasianthus sondangii (Rubiaceae, Lasianthus section Nudiflorae), a new species with a unique spiciform inflorescence from Central Vietnam. - TRAN, Thi Thuy Nhan; NGUYEN, Van Canh; LUONG, Van Dung; PHAN-Thi, Thanh Nha; NGUYEN, Hoa Thi; TRUONG, Ba Vuong; NGUYEN, Quoc Bao (Taiwania, 2026)