There are six tepals, six stamens and a pistil formed from three fused carpels. Each has five stamens and a gynoecium composed of two fused carpels. The pistil consists of two connate carpels. There are five stamens and a pistil formed from three fused carpels. Each flower has four projecting stamens and two fused carpels. These protuberances develop into the sepals, petals, stamens, and carpels. The pistils are composed of two to many connate carpels. There are six stamens, three fused carpels and three styles. There are six stamens, two fused carpels and two styles. The gynoecium consists of a compound pistil with two carpels. There are five stamens surrounding the stigma and style and two fused carpels. These verticils follow an acropetal development, giving rise to sepals, petals, stamens and carpels. The carpels and stamens of orchids are fused into a column. Within the carpels are ovules which develop into seeds after fertilization. In some species, however, the flowers are unisexual with only carpels or stamens.