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Casa Grande Ruins National Monument
Located approximately between Tucson and Phoenix in Arizona is the Casa Grande Ruins National Monument. This 4-story structure is one of the largest native structures found in North America and was left empty around 1450 C.E. It is such an important archaeological site that President Benjamin Harrison in 1892 designated it as the first prehistoric and cultural reserve created in the US.
Woody plants here include Mesquite, Ironwood, Palo Verde and Creosote. Other interesting plants you may find here include Wolfberry (Lycium exsertum), Battle Saltbush (Atriplex polycarpa), Triangle-Leaf Bursage, (Ambrosia deltoidea) and Velvet Mesquite (Prosopis velutina), Carelessweed (Amaranthus palmeri), Scarlet Spiderling (Boerhavia coccinea) and Cuman Ragweed (Ambrosia confertifolia).
Non-native species include the ubiqutious Asian mustard (Brassica tournefortii) and Redstem Filaree (Erodium cicutarium).