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Domesticated Rice comprises two species in the Poaceae ("true grass") family, Oryza sativa and Oryza glaberrima. These plants are native to tropical and subtropical southern and southeastern Asia and Africa, respectively. Rice provides more than one fifth of the calories consumed by humans in their global diets.[1] (The term "wild rice" can refer to the wild species of Oryza, but conventionally refers to species of the related genus Zizania, both wild and domesticated.) Rice is a monocarpic annual plant, growing to 1–1.8 m tall, occasionally more depending on the variety and soil fertility. The grass has long, slender leaves 50–100 cm long and 2–2.5 cm broad. The small wind-pollinated flowers are produced in a branched arching to pendulous inflorescence 30–50 cm long. The seed is a grain (caryopsis) 5–12 mm long and 2–3 mm thick.