David Griffiths

Opuntia aciculata, also called Chenille pricklypear, old man's whiskers, and cowboy's red whiskers, is a perennial dicot and an attractive ornamental cactus native to Texas. It belongs to the genus Opuntia (prickly pear cacti). It is also widespread in Nuevo Leon and Tamaulipas (northern Mexico). It was reported from Nuevo León, Mexico, according to D. Weniger in 1970. The specific name aciculata derives from many sources: the Latin word acicula which means "a small pin for a headdress". Chenille prickly pear, one of its vernacular names, comes for the fringe of spines around the edge of the

Bouteloua gracilis, the blue grama, is a long-lived, warm-season (C4) perennial grass, native to North America. It is most commonly found from Alberta, Canada, east to Manitoba and south across the Rocky Mountains, Great Plains, and U.S. Midwest states, onto the northern Mexican Plateau in Mexico. Blue grama accounts for most of the net primary productivity in the shortgrass prairie of the central and southern Great Plains. It is a green or greyish, low-growing, drought-tolerant grass with limited maintenance.

Opuntia fuliginosa is a species of prickly pear cactus found in the Sonoran Desert in Mexico.

Opuntia atrispina is a cactus species in the genus Opuntia.

Bouteloua eludens, colloquially known as Santa Rita grama or sometimes Santa Rita Mountain grama, is a grass species in the grama genus native to southern Arizona in the United States and northern Sonora in Mexico.

Bouteloua radicosa, colloquially known as purple grama, is a grass species in the grama genus native to the southwestern United States and northern Mexico.

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Bouteloua parryi, colloquially known as Parry's grama, is a grass species in the grama genus native to the southwestern United States and northern Mexico.

Opuntia nemoralis is a species of cactus (Cactaceae) native to the United States.

Opuntia anahuacensis is a cactus species in the genus Opuntia of the family Opuntioideae. It is commonly misidentified as O. lindheimeri and less commonly as O. bentonii.

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Opuntia cacanapa is a cactus in the genus Opuntia. In the United States, it is found primarily in the southern Trans-Pecos and the South Texas Plains from Brewster, Pecos, and Uvalde Counties south to Cameron County. It also occurs in nearby Mexico from the Rio Grande to as far south as Guanajuato and northern Hidalgo.

Opuntia bentonii was proposed by some botanists to be a synonym of Opuntia stricta. However, O. bentonii, which grows in Texas, is separate and distinct from O. stricta. O. bentonii was clearly described by Griffiths in 1911. Along with O. stricta,O. bentonii was one of the pest pears of Australia in the early Twentieth Century.

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Opuntia alta is a cactus species in the genus Opuntia. It is a large plant, with some older specimens forming trees to 4.6 metres (15 ft) tall. It is a naturally occurring hybrid of Opuntia engelmannii var. lindheimeri and O. stricta native to Texas and Louisiana.

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