SINGAPORE - On the edges of a tropical rainforest, where there are vines draping branches and climbing plants snaking up trunks, the insidious grip of a smothering weed could be easily missed.
Yet, the invasive Zanzibar yam (Dioscorea sansibarensis) - described as the Batman plant for its bat-shaped leaves - is threatening the regeneration of Singapore's forests by depriving native plants of sunlight.
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