الأربعاء، 18 ديسمبر، 2013

Species of cactus

 cactus
Most cacti live in habitats subject to at least some drought. Many live in extremely dry environments, even being found in the Atacama Desert, one of the driest places on earth. Cacti show many adaptations to conserve water
 cactus
 Most species of cacti have lost true leaves, retaining only spines, which are highly modified leaves. As well as defending against herbivores, spines help prevent water loss by reducing air flow close to the cactus and providing some shade
 cactus
 Cactus spines are produced from specialized structures called areoles, a kind of highly reduced branch. Areoles are an identifying feature of cacti
 cactus
 As well as spines, areoles give rise to flowers, which are usually tubular and multipetaled

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