21. Density-dependent root gnawing by rodents is proposed as one such mechanism in the Larrea-Opuntia system. 22. On " Opuntia quimilo " the larvae occur in the flowers and the crown of the fruit. 23. Cochineal is a red dye produced by a scale insect that lives on species of " Opuntia ". 24. A primarily cacti from the genus " Opuntia ", feeding on moisture and nutrients in the cacti. 25. Where hammock edges grade into coastal marshes semaphore cactus ( " Opuntia corallicola " ) can be found. 26. That which is not lake is primarily grasslands with some opuntia , huisache ( Acacia ) and other arid plants. 27. The padded and low-growing Opuntia , commonly called prickly pear, is the best known of this tolerant bunch. 28. A delicate rose color in Navajo rugs comes from fermented prickly pear cactus fruit, " Opuntia polyacantha ". 29. Other plants, such as opuntias , have hairs or spines that cause mechanical irritation, but do not inject chemicals. 30. Introduced species associated to disturbed areas, such as agaves and opuntias , are found with remnants of the native flora.
