Opuntia cacanapa Opuntia cacanapa Opuntia cacanapa is a cactus in the "Opuntia" genus. In the United States it is found on the South Texas Plains in Brewster County and adjacent counties to the southeast. It also occurs in nearby Mexico. The plants are variable in size, but can form shrubby trees from 1 to 2 m tall. They grow intermixed with other shrubs and small trees. The glaucous pads are pale and not dark green. Cladodes are 15 to 20 cm long and may be elliptical, obovate, or even subcircular. The flowers are a rich, canary yellow and have a prominent green
Opuntia arenaria Opuntia arenaria Opuntia arenaria was considered a variety of "O. polyacantha" by many botanists, and is still treated that way in the Flora of North America. However, "O. arenaria" is diploid and "O. polyacantha" is tetraploid. It was described by Engelmann in 1856. "Opuntia arenaria" can grow in soil that is essentially pure sand. It has rhizomes up to 1.5 m long that give rise to above ground shoots with small cladodes that are 4-7 x 2–3 cm in size. Major spines are found in the distal areoles and are often reflexed, up to 30 mm long. Minor spines are