Bouteloua

Bouteloua is a genus of plants in the grass family. Members of the genus are commonly known as grama grass.

Taxonomy and systematics
The genus was named for Claudio and Esteban Boutelou, 19th-century Spanish botanists. David Griffiths produced a 1912 monograph on the genus.

Description
Bouteloua includes both annual and perennial grasses, which frequently form stolons. Species have an inflorescence of 1 to 80 racemes or spikes positioned alternately on the culm (stem). The rachis (stem) of the spike is flattened. The spikelets are positioned along one side of the spike. Each spikelet contains one fertile floret, and usually one sterile floret.

Distribution
Bouteloua is found only the Americas, with most diversity centered in the southwestern United States. It also occurs in the Ciénaga de Zapata Biosphere Reserve of Cuba.

Uses
Many species are important livestock forage, especially blue grama.

Species
Species of Bouteloua include:
 * Bouteloua alamosana Vasey – Mesoamerica
 * Bouteloua americana (L.) Scribn. – American grama – southern Mexico, Central America, West Indies, northern South America
 * Bouteloua annua Swallen – Baja California Sur, Sonora
 * Bouteloua aristidoides (Kunth) Griseb. – needle grama – United States (California, Arizona, Nevada, Utah, New Mexico, Texas); Mexico, South America, Aruba
 * Bouteloua barbata Lag. – six-weeks grama – United States, Mexico
 * Bouteloua bracteata (McVaugh) Columbus – Michoacán
 * Bouteloua breviseta Vasey – United States, Mexico
 * Bouteloua chondrosioides (Kunth) Benth. ex S.Watson – sprucetop grama – United States (AZ TX); Mesoamerica
 * Bouteloua curtipendula (Michx.) Torr. – sideoats grama – widespread in USA, Canada, Mexico
 * Bouteloua dactyloides (Nutt.) Columbus – buffalograss – USA, Canada, Mexico
 * Bouteloua dimorpha Columbus – Great Plains in USA, Canada, Mexico, Honduras, Cuba, Trinidad
 * Bouteloua distans Swallen – Mexico
 * Bouteloua disticha (Kunth) Benth. – from southern Mexico to Ecuador; also Cuba, Galápagos
 * Bouteloua eludens Griffiths – USA (Arizona, New Mexico), Mexico (Chihuahua, Coahuila, Sonora)
 * Bouteloua eriopoda (Torr.) Torr. – United States, Mexico
 * Bouteloua gracilis (Willd. ex Kunth) Lag. ex Griffiths – blue grama – Great Plains in USA, Canada, Mexico
 * Bouteloua hirsuta Lag. – USA (Great Plains, Southwest), Mexico, Guatemala
 * Bouteloua johnstonii Swallen – Coahuila
 * Bouteloua juncea (Desv. ex Beauv.) A.S.Hitchc. – lamilla – Cuba, Hispaniola, Puerto Rico
 * Bouteloua media (E.Fourn.) Gould & Kapadia – from central Mexico to Uruguay
 * Bouteloua megapotamica (Spreng.) Kuntze – Argentina, Brazil, Uruguay, Bolivia
 * Bouteloua mexicana (Scribn.) Columbus – Mexico, Belize, Guatemala, Honduras
 * Bouteloua multifida (Griffiths) Columbus – from Sonora to Oaxaca
 * Bouteloua nervata Swallen – Hidalgo, México State
 * ''Bouteloua parryi (E. Fourn.) Griffiths – Parry's Grama, Texas, Arizona, New Mexico, Northern Mexico
 * Bouteloua pectinata (Bouteloua hirsuta var. pectinata) – tall grama, eyebrow grass – Texas
 * Bouteloua pedicellata Swallen – Puebla, Hidalgo, Guanajuato, Tlaxcala, Nuevo León, Veracruz
 * Bouteloua polymorpha (E.Fourn.) Columbus – from Durango to Oaxaca
 * Bouteloua purpurea Gould & Kapadia – Guanajuato, D.F., San Luis Potosí, México State, Hidalgo, Querétaro
 * Bouteloua radicosa (E. Fourn.) Griffiths – purple grama – USA (Arizona, New Mexico), Mexico (Chihuahua, Michoacán, Coahuila, Morelos, Puebla, Durango, Zacatecas, Distrito Federal de México, Jalisco, Nuevo León, Hidalgo, Oaxaca, Tamaulipas)
 * Bouteloua reederorum Columbus – Durango, Puebla, Zacatecas, Oaxaca
 * Bouteloua reflexa Swallen – Sonora, Sinaloa, Baja California, Baja California Sur, Nayarit
 * Bouteloua repens (Kunth) Scribn. & Merr. – slender grama – Arizona, New Mexico, Texas, Oklahoma, Mesoamerica, Colombia, Venezuela, West Indies
 * Bouteloua rigidiseta (Steud.) Hitchc. – Texas grama – New Mexico, Texas, Oklahoma, Arkansas, Louisiana, Mexico (Aguascalientes, Durango)
 * Bouteloua simplex Lag. Much of southwestern and central United States, Central America, western South America
 * Bouteloua scabra (Kunth) Columbus – from Hidalgo to Honduras
 * Bouteloua stolonifera Scribn. – San Luis Potosí, Aguascalientes, Zacatecas
 * Bouteloua swallenii Columbus – from El Salvador to Venezuela
 * Bouteloua triaena (Trin. ex Spreng.) Scribn. – from Sinaloa to Guatemala
 * Bouteloua trifida Thunb. – Arizona, California, Nevada, New Mexico, Texas, Utah, Mexico
 * Bouteloua uniflora Vasey – Nealley grama, oneflower grama – Utah, Texas, Coahuila, Zacatecas, Nuevo León, Querétaro, Oaxaca, San Luis Potosí, Tamaulipas
 * Bouteloua vaneedenii Pilg. – Cuba, Leeward Islands, Venezuela
 * Bouteloua warnockii Gould & Kapadia – Warnock's grama – New Mexico, Texas, Sonora, Chihuahua, Coahuila, Nuevo León, Tamaulipas, Zacatecas
 * Bouteloua williamsii Swallen – Mexico, Guatemala, Honduras

Formerly included
Some grass species, formerly classified under Bouteloua, have been reclassified under other genera including:
 * Cathestecum
 * Chondrosum
 * Neobouteloua