Subsect. Siphonochlamys (Bobr.) P. C. Li (Betulaceae)
亚组2. 华榛亚组Subsect. 2. Siphonochlamys (Bobr.) P. C. Li stat. nov. ——Corylus subgen. Siphonochlamys Bobr.
名称文献：Subsect. 2. Siphonochlamys (Bobr.) P. C. Li stat. nov. ——Corylus subgen. Siphonochlamys Bobr., Sov. Bot. 1: 32. 1936. —— Cor ylus sect. Avellana subsect. Colurnae Schneid. in Sarg., Pl. Wils. 2: 449. 1916. p. p.
形态特征：乔木或小乔木，少有灌木。果苞管状，完全包被坚果。长超过果的1-2倍，在果的上部缢缩。
产地分布：本亚组有下列3种。