These protuberances develop into the sepals, petals, stamens, and carpels. The sepals and petals together form the perianth. They have five to ten oval showy sepals and three green bracts. The flowers are nearly perfectly pentamerous, with five petals, sepals, and stamens. The flowers are wide, with five lemon-yellow petals, five sepals, and ten stamens. It has six petals which are smaller than sepals, obovate, and membranous. The calyx, long, consist of upper three sepals and the hairy lower two. Zingiberales demonstrate an evolutionary trend in the ontogeny of the perianth (sepals and petals). The husks of walnuts develop from the bracts, bracteoles, and sepals, or sepals only. The calyx consists of five free sepals, of which one pair is oft strongly reduced. The flowers are bilaterally symmetrical with five united petals and five united sepals. The flower has 5 oblong, green sepals and 5 white petals. Flowers have two tiny sepals and four petals. The flower has five sepals and five usually yellow petals. The flowers often have five generally fused sepals and five free petals.