The term wheat is used to describe any of the cereal grasses of the genus Triticum and their consumable grain. Wheat grain consists of the small, dry fruit produced by the grasses. The grains form at the head of the plant, which is comprised of alternating spikelets that may hold from one to five flowers. Each flower and the single ovary it holds is protected by membranous tissue collectively called the glume. Wheat is self-pollinating, and when the ovary is fertilized it develops into a kernel, or grain, a process that takes about a month.