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The fruit of the nopal cactus, called tuna, represents the heart of Copil, the nephew of the god Huitzilopochtli. The god ordered the people to "build the city in the place of Copil's heart" (Ramírez Codex), where the cactus grew on his land. It also alludes to the human sacrifice customs of the Aztecs.
A cactus (pl.: cacti, cactuses, or less commonly, cactus) [3] is a member of the plant family Cactaceae (/ k æ k ˈ t eɪ s i. iː,-ˌ aɪ /), [a] a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. [4]
A cycle basis of the graph is a set of simple cycles that forms a basis of the cycle space. [ 2 ] Using ideas from algebraic topology , the binary cycle space generalizes to vector spaces or modules over other rings such as the integers, rational or real numbers, etc. [ 3 ]
The homology of leaves is an easy conclusion to make. The plant morphologist goes further, and discovers that the spines of cactus also share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well.
Sand dollar cactus, sea urchin cactus, star peyote: small parts of Texas in the United States and Mexico. Astrophytum capricorne (A.Dietr.) Britton & Rose: Goat's horn cactus: Coahuila regions of Northern Mexico. Astrophytum caput-medusae D.R.Hunt: Nuevo León, Mexico Astrophytum coahuilense (H.Moeller) Kanfer: Coahuila and Durango, Mexico
Echinocereus is a genus of ribbed, usually small to medium-sized, cylindrical shaped cacti, comprising about 70 species native to the southern United States and Mexico in very sunny, rocky places.
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The Cactoideae are the largest subfamily of the cactus family, Cactaceae, and are widely distributed throughout the Americas. Cactaceae is the 5th most endangered plant or animal family evaluated globally by the International Union for Conservation of Nature. [1] Around 80% of cactus species belong to this subfamily. [2]