The Cactaceae familia has four subfamilia: Pereskioideae, Maihuenioideae, Opuntioideae and Cactoideae.
Some species in this familia are good-looking enough to display in front of our home--in a row with an orchid, adding natural taste and "endurance style". The species is known as survivor in drought area for long period of time.
A worthfull reading on cactus: The Cactaceae, Vol. 1 or this The Cactaceae: Description And Illustrations Of Plants Of The Cactus Family, Vol. I & II and this The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family Complete in 4 Volumes Bound as 2 Volumes I, II, III and IV In Two Volumes