Cactus
What would a trip to Arizona be without atleast one photo of Cacti.
Cacti are perennial and grow as trees, shrubs, or vines. Most species are terrestrial, but there are also many epiphytic species, especially in the tribes Rhipsalideae and Hylocereeae. In most species, except for the sub-family Pereskioideae (see image), the leaves are greatly or entirely reduced. The leaves may also be tiny and deciduous as can be seen on new shoots of Opuntia. Spines grown by the cacti are actually modified leaves; the stems (the green "pads" of many cacti) have also evolved to photosynthesize. The study of when spines grow and how they can be used to tell the cactus' age is called acanthochronology.
Cactus
What would a trip to Arizona be without atleast one photo of Cacti.
Cacti are perennial and grow as trees, shrubs, or vines. Most species are terrestrial, but there are also many epiphytic species, especially in the tribes Rhipsalideae and Hylocereeae. In most species, except for the sub-family Pereskioideae (see image), the leaves are greatly or entirely reduced. The leaves may also be tiny and deciduous as can be seen on new shoots of Opuntia. Spines grown by the cacti are actually modified leaves; the stems (the green "pads" of many cacti) have also evolved to photosynthesize. The study of when spines grow and how they can be used to tell the cactus' age is called acanthochronology.