1) Caryophylloid dicot genus 2) Genus carnegiea 
(Candelabra Cactus, Giant Cactus, Sahuaro, Saguaro) This group consists of only one, giant cactus native to the southwestern U.S. and northwest Mexico. C. gigantea (Candelabra Cactus; Giant Cactus; and Saguaro or Sahuaro) is one of the largest of the Cactus family. In the wild, the Saguaro Cactus usually forms large colonies. It is a home to many b...
[n] - caryophylloid dicot genus with only one species: saguaro
genus Carnegiea noun caryophylloid dicot genus with only one species: saguaro