Hemiboea chanii C.H.Nguyen & Aver., sp. nov. A plants in natural habitat B leaf blade, abaxial surface C flowering branch D flower, frontal view E–G flower, side and half side views H stamens and staminodes I involucre J flower inside and outside views K ripening capsule, cross section L-M pistil and ripening capsule, side view N calyx segments. Photos by Nguyen Van Ly, correction and design by C.H. Nguyen.