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杨桐可以作为植物染料,寒食、清明前后以杨桐叶染饭是江南民俗。海桐是著名的观叶植物,明代将海桐、山矾混同;而在宋代,山矾另有所指。“海桐皮”其实是刺桐皮,与海桐无关。臭梧桐花期长、花序大,为著名园林花木。胡桐,即胡杨,出自西域,胡桐树脂有药用等价值。“拆桐”是后人断取柳永词而生造出来的,“拆桐花”就是泡桐花。
Yang Tong can be used as plant dyes, cold food, before and after the Qingming Yang Yeh-leaf dye rice is southern folk. Pittosporum is a famous foliage plant, the Ming Dynasty will Pittosporum, Shanluo mix; in the Song Dynasty, alum otherwise pointed. “Pittosporum skin” is actually a stingy skin, has nothing to do with Pittosporum. Stinky flowering period, inflorescence large, famous garden flowers and trees. Jutong, that Populus, from the Western Regions, the resinous medicinal value. “Demolition Tong” is the future generations get Liu Yong word and created, “Demolition Tong flower ” is paulownia flower.