A tuberous plant(Arisaema dracontium) of eastern North America, having divided leaves and minute flowers at the base of a long, slender spadix projecting from a narrow green spathe. Also called dragonroot龙根天南星：产于北美东部的一种块茎植物（天南星属龙根天南星） ，有开裂的叶和窄小佛焰苞上呈长而细肉穗花序的小花 也作 dragonroot