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Yushania fimbriata (Keng. zing)                                                                                               T56

 

This bamboo is a common component of coniferous and broadleaved forest in temperate parts of eastern and central Bhutan, from 1,700m to 2,600m. It is very similar to the western species Y. maling, but it is usually larger. This is a very vigorous bamboo, reaching up to 8m in height and 2cm in diameter, with internodes up to 40cm long. The combination of a dense ring of hairs at the base of the culm sheaths, no thickened transparent band on the leaf edges, and very erect leaf sheath bristles with no auricles, distinguishes this bamboo from other Yushania species in Bhutan. The culm sheaths and the leaf sheaths are quite similar to those of Borinda grossa, but the culms are rough and do not have the fine ridges seen on 

 

the culms of B. grossa, and it spreads rather than forming tight clumps. This bamboo will often form dense thickets that can severely restrict the regeneration of trees. Like Y. punatsangensis it can be categorised as an invasive weed. If it is to be suppressed substantially, it has to be burnt and grazed, and the new shoots should be cut repeatedly each summer. The rhizomes grow deep in the soil, and are solid and strong, so that physical removal is very difficult. Areas of forest with any large vigorously growing species of Yushania in the understorey should not ideally be clear-felled, as the extra light may allow the bamboo to dominate regeneration of tree species.

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