Plant types

Types of Aloe: 

There are over 500 types of aloe plants that do a variety of things. Aloe Vera plants may be short-stemmed or stemless with thick, full leaves that are either green or grayish green. Some varieties of aloe have white flecks on their stems. 

https://www.sproutabl.com/plants/succulents/types-of-aloe-vera-plants/ 

 http://aloeandyou.com/aloe-vera/all-about-aloe-vera.htm 

Types of Succulents: 

Different types of succulent plants come from arid deserts, seaside cliffs and even limbs of steamy jungle trees.  With some exceptions, most large succulent plants are not able to survive hard freezes, but quite a few small and miniature succulents tolerate down into the teens. Succulent types can range from individuals to spreading colonies, and from tall to tiny, plump to wispy, and with or without spiny thorns. Within each type there are often succulent varieties with amazing differences in leaf shape or color. Some succulents can even be edible including the young paddle-like leaves and sweet, plum-like fruits of prickly pear, and many more.  

https://www.diynetwork.com/how-to/outdoors/gardening/types-of-succulents  

 http://freshpatio.com/butterfly-garden-design/ 

Types of cacti:  

 The 'Lava Cactus', which is found on the Galapagos Islands, survives only in the harsh environment of the lava fields. It is one of the first plants to establish itself on lava that flows out and cools after a fresh volcanic eruption. Cactus are found in many shapes and sizes and can survive in diverse habitats. We generally believe cacti only thrive in an arid desert-like environment but, many cacti have rainforests too as their natural habitat. 

https://gardenerdy.com/types-of-cactus 

  https://www.ebay.co.uk/itm/Set-of-3-Mixed-Cactus-Cacti-Plants-In-5-5cm-Pots-/263242712488