1	Lower lip of calyx with teeth 1–2mm long, subequal, upper surface of leaves finely reticulate	var. brevidentata
–	Lower lip of calyx with teeth 2–4 mm long, 2 × longer than upper teeth, upper surface of leaves coarsely reticulate	2
2	Inflorescence axes, calyces and upper surface of leaves villose when young, pubescent when mature	var. villosa
–	Inflorescence axes, calyces and upper surface of leaves sparsely pubescent when young, becoming glabrescent when mature	var. sinensis