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Succulent plant

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Succulent plants, such as this Aloe, sequester water in their fleshy leaves.
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Succulent plants, such as this Aloe, sequester water in their fleshy leaves.

Succulent plants, or succulents, are plants that store water in their enlarged fleshy leaves, stems, or roots. The enlargement is usually due to the greater amount of the parenchyma tissue, as in the aloe vera plant.

Although all plants store water, succulent plants are especially adapted and use their hollow bodies to store water for long periods. This allows them to survive in arid environments, where they receive little competition from other plants and herbivores. During the day, their habitat is rather hot. However, the habitat is cooler at night allowing the succulents to respire. Often, morning dewfall helps the plants to survive: Using long hairs, that cover a large part of their surface, some succulents are able to absorb dew.

Many succulents have a waxy coating on their stems and leaves, helping them to retain moisture. Having a large internal volume for storage but minimum surface area is also important to prevent water loss. CAM photosynthesis is also a common water conservation feature found in many succulents.

Succulence is a feature due to convergent evolution and is not necessarily an indication of genetic relationship.

Families and genera

Aizoaceae:Lithops julii, leaf succulent
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Aizoaceae:Lithops julii, leaf succulent

Apocynaceae:Pachypodium lealii, stem succulent
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Apocynaceae:Pachypodium lealii, stem succulent

Asphodelaceae:Haworthia arachnoidea, leaf succulent
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Asphodelaceae:Haworthia arachnoidea, leaf succulent

Bombaceae:Adansonia gregorii, stem succulent
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Bombaceae:Adansonia gregorii, stem succulent

Cactaceae:Rebutia muscula, stem succulent
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Cactaceae:Rebutia muscula, stem succulent

Crassulaceae:Crassula ovata, stem and leaf succulent
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Crassulaceae:Crassula ovata, stem and leaf succulent

Euphorbiaceae:Euphorbia obesa ssp. symmetrica, stem succulent
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Euphorbiaceae:Euphorbia obesa ssp. symmetrica, stem succulent

Moringaceae:Moringa ovalifolia, stem succulent
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Moringaceae:Moringa ovalifolia, stem succulent

Nolinaceae:Beaucarnea recurvata, stem succulent
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Nolinaceae:Beaucarnea recurvata, stem succulent

Ruscaceae:Dracaena draco, stem succulent
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Ruscaceae:Dracaena draco, stem succulent

Plant families and genera in which succulent species occur are listed below.

For some families, most members are succulent; for example the Cactaceae, Agavaceae, Aizoaceae, and Crassulaceae.

The table below shows the number of succulent species found in some families:

Family Succulent # Modified parts Distribution
Agavaceae 300 Leaf North and Central America
Cactaceae 1600 Stem The Americas
Crassulaceae 1300 Leaf (root) Worldwide
Aizoaceae 2000 Leaf Southern Africa
Apocynaceae 500 Stem Africa, Arabia, India
Didiereaceae 11 Stem Madagascar (endemic)
Euphorbiaceae > 1000 Stem and/or leaf and/or root Africa, Madagascar, Asia, the Americas, Europe, Australia
Asphodelaceae 500 Leaf Africa, Madagascar
Portulacaceae ? Leaf and stem The Americas

External links

 


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