Morphology of Begonia giganticaulis D.K.Tian & W.G.Wang, sp. nov. A one of the single tallest plants cut into four sections B main stem base C stems showing colour of nodal cross-sections D main stem with much expanded node and whitish-green lines or spots E expanded node on terminal branch F, G male plant branches showing inflorescences and different colours H female branches I adaxially (left) nearly glabrous and abaxially sparse hairs on veins (right, arrows indicate) on blade surfaces J stipules showing shape and colour. (Photo F by Wen-Guang Wang; others by Dai-Ke Tian).