Most rattans differ from other palms in having slender stems, 2–5 cm diameter, with long internodes between the leaves; also, they are not trees but are vine-like, scrambling through and over other vegetation. Rattans are also superficially similar to bamboo. Unlike bamboo, rattan stems (“malacca”) are solid, and most species need structural support and cannot stand on their own. However, some genera (e.g. Metroxylon, Pigafetta, Raphia) are more like typical palms, with stouter, erect trunks. Many rattans have spines which act as hooks to aid climbing over other plants, and to deter herbivores. Rattans have been known to grow up to hundreds of metres long. Most (70%) of the world’s rattan population exist in Indonesia, distributed among Borneo, Sulawesi, Sumbawa islands. The rest of the world’s supply comes from the Philippines, Sri Lanka, Malaysia and Bangladesh.