Bamboo longbow is made in the same way as my South India longbow. The back, middle lamination and the belly are all of Bamboo. From all natural materials, bamboo has the best characteristics for the bows. Bamboo bows are (compared with the similar bows from wood) faster and smoother to draw. Because they have higher efficiency then wooden bows, they can be made 5-10% lighter. This can be handy for example for women, older archers and people with arm/shoulder injures.
(click on a picture to enlarge)