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

Succulent plants, also known as succulents or fat plants, are water-retaining plants adapted to arid climate or soil conditions. Succulent plants store water in their leaves, stems and/or roots. Geophytes survive unfavourable periods by dying back to underground storage organs (tuberous roots, corms, bulbs, and rhizomes). They can be regarded as succulents. Some plants are succulent geophytes. The storage of water often gives succulent plants a more swollen or fleshy appearance than other plants, also known as succulence. In addition to succulence, succulent plants variously have other water-saving features. These may include:

• Crassulacean acid metabolism (CAM) to minimize water loss
• Absent, reduced, or cylindrical to spherical leaves
• reduction in the number of stomata
• stems, rather than leaves, as the main site of photosynthesis
• a compact, reduced, cushion-like, columnar or spherical growth form
• ribs enabling rapid increases in plant volume and decreasing surface area exposed to the sun
• a waxy, hairy or spiny outer surface to create a humid microhabitat around the plant which reduces air movement near the surface of the plant, thereby reducing water loss.
• roots very near the surface of the soil, so they are able to take up moisture from very small showers or even from heavy dew
• ability to remain plump and full of water even with high internal temperatures (e.g. 52⁰ Celsius)
• a very impervious outer cuticle (skin)
• they contain mucilaginous substances which retain water strongly

Many succulents come from the dry areas of the tropics and subtropics, such as steppes, semi-desert and desert. High temperatures and low precipitation force plants to collect and store water in order to survive long dry periods. Succulents also occur as epiphytes, as such they have limited or no contact with the ground, and are dependent on their ability to store water. Succulents also occur as inhabitants of sea coasts, or salt pans which are exposed to high levels of dissolved minerals.

The best known succulents are cacti (family: Cactaceae). Virtually all cacti are succulents, but not all succulents are cacti.

[edit] Families and genera

Aizoaceae:Lithops julii, leaf succulent

Apocynaceae:Pachypodium lealii, stem succulent

Asphodelaceae:Haworthia arachnoidea, leaf succulent

Cactaceae:Rebutia muscula, stem succulent

Crassulaceae:Crassula ovata, stem and leaf succulent

Euphorbiaceae:Euphorbia obesa ssp. symmetrica, stem succulent

Cylindropuntia imbricata:stem, woody succulent

Moringaceae:Moringa ovalifolia, stem succulent

Nolinaceae:Beaucarnea recurvata, stem succulent

Ruscaceae:Dracaena draco, stem succulent

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

• Agavaceae: Agave, Beschorneria, Chlorophytum, Furcraea, Hesperaloe, Hesperoyucca, Yucca
• Aizoaceae: Aizoanthemum, Aizoon, Galenia, Sesuvium, Tetragonia, Trianthema, Zaleya
  • subfamily Mesembryanthemoideae (syn. Mesembryanthemaceae): Acrodon, Aethephyllum, Aloinopsis, Amoebophyllum (non-current), Amphibolia, Antegibbaeum, Antimima, Apatesia, Aptenia, Arenifera, Argyroderma, Aridaria, Aspazoma, Astridia, Bergeranthus, Berrisfordia (non-current), Bijlia, Braunsia, Brianhuntlia, Brownanthus, Calamophyllum, Carpanthia, Carpobrotus, Carruanthus, Caryotophora, Caulipsilon, Cephalophyllum, Cerochlamys, Chasmatophyllum, Cheiridopsis, Circandra, Cleretum,Conicosia, Conophytum, Corpuscularia, Cylindrophyllum, Dactylopsis, Delosperma, Dicrocaulon, Dinteranthus, Diplosoma, Disphyma,Dorotheanthus, Dracophilus, Drosanthemum, Eberlanzia, Ebracteola, Ectotropis (non-current), Enarganthe, Erepsia, Esterhuysenia, Eurystigma (non-current), Faucaria, Fenestraria, Frithia, Gibbaeum, Glottiphyllum, Halenbergia (non-current), Hallianthus, Hameria, Hartmanthus, Hereroa, Herrea (non-current), Herreanthus (now Conophytum), Hydrodea (non-current), Hymenogyne, Ihlenfeldtia, Imitaria (non-current), Jacobsenia, Jensenbotrya, Jordaaniella, Juttadinteria, Kensitia (non-current), Khadia, Lampranthus, Lapidaria, Leipoldtia, Lithops, Machairophyllum, Malephora, Marlothistela, Maughaniella (non-current), Mesembryanthemum, Mestoklama, Meyerophytum, Micropterum (non-current), Mimetophytum (non-current), Mitrophyllum, Monilaria, Mossia, Muiria, Namaquanthus, Namibia, Nanathus, Nelia, Neohenricia, Neorhine (non-current), Nycteranthus (non-current), Octopoma, Odontophorus, Oophytum, Ophthalmophyllum (non-current), Orthopterum, Oscularia, Ottosonderia, Pherelobus (non-current), Phiambolia, Phyllobolus, Platythyra (non-current), Pleiospilos, Polymita, Prenia, Psammophora, Psicaulon, Rabiea, Rhinephyllum, Rhombophyllum, Ruschia, Ruschianthemum (non-current), Ruschianthus, Ruschiella, Saphesia, Sarozona,Sceletium, Schlecteranthus, Schwantesia, Scopologena, Semnanthe (now Erepsia), Skiatophytum, Smicrostigma, Sphalmanthus (non-current), Stayneria, Stoeberia, Stomatium, Synaptophyllum, Tanquana, Titanopsis, Trichodiadema, Vanheerea, Vanzijlia, Viokia, Wooleya, Zeuktophyllum
• Amaranthaceae: Arthraerua
• Amaryllidaceae (geophytes): Ammocharis, Apodolirion, Boophone, Brunsvigia, Crinum, Crossyne, Cryptostephanus, Cyrtanthus, Gethyllis, Habranthus, Haemanthus, Hessea, Nerine, Pancratium, Rauhia, Scadoxus, Strumaria, Zephyranthes,
• Anacardiaceae: Operculicaria, Pachycormus
• Apiaceae: Steganotaenia
• Apocynaceae: Adenium, Mandevilla, Pachypodium, Plumeria
  • subfamily Asclepiadoideae (syn. Asclepiadaceae): Absolmsia, Asclepias, Australluma, Aspidoglossum, Aspidonepsis, Baynesia, Brachystelma, Caralluma, Ceropegia, Chlorocyathus, Cibirhiza, Cordylogyne, Cynanchum, Dischidia, Dischidiopsis, Duvalia, Duvaliandra, Echidnopsis, Edithcolea, Eustegia, Fanninia, Fockea, Glossostelma, Hoodia, Hoya, Huernia, Huerniopsis, Ischnolepis, Larryleachia, Lavrania, Marsdenia, Matelea, Miraglossum, Notechidnopsis, Odontostelma, Ophionella, Orbea, Orbeanthus, Pachycarpus, Parapodium, Pectinaria, Periglossum, Petopentia, Piaranthus, Pseudolithos, Quaqua, Raphionacme (geophyte), Rhytidocaulon, Riocreuxia, Sarcorrhiza, Sarcostemma, Schizoglossum, Schlechterella, Stapelia, Stapelianthus, Stapeliopsis, Stathmostelma, Stenostelma, Stomatostemma, Tavaresia, Trachycalymma, Tridentea, Tromotriche, Tylophora, White-sloanea, Woodia, Xysmalobium
• Araceae: Zamioculcas
• Araliaceae: Cussonia
• Asparagaceae: Myrsiphyllum (now Asparagus)
• Asphodelaceae: Aloe (succulents and succulent geophytes), Astroloba, x Astroworthia, Bulbine (succulent geophytes, succulents, and geophytes), Bulbinella (geophyte), Chortolirion (succulent geophytes), Gasteria, Haworthia, Poellnitzia, Trachyandra (succulent geophytes and succulents),
• Asteraceae: Arctotheca, Baeriopsis, Cadiscus, Chrysanthemoides, Coulterella, Crassocephalum, Didelta, Emilia, Eremothamnus, Gymnodiscus, Gynura, Hillardiella (geophyte), Lopholaena, Monoculus, Nidorella, Osteospermum, Othonna (succulents and succulent geophytes), Phaneroglossa, Poecilolepis, Polyachyrus, Pteronia, Senecio, Solanecio,Tripteris
• Balsaminaceae: Impatiens
• Basellaceae: Anredera, Basella
• Begoniaceae: Begonia
• Bombacaceae: Adansonia, Cavanillesia, Ceiba, Pseudobombax
• Boraginaceae: Heliotropium
• Brassicaceae: Heliophila, Lepidium
• Bromeliaceae: Abromeitiella
• Burseraceae: Boswellia, Bursera, Commiphora
• Cactaceae: Acanthocalycium, Acanthocereus, Ariocarpus, Armatocereus, Arrojadoa, Arthrocereus, Astrophytum, Austrocactus, Aztekium, Bergerocactus, Blossfeldia, Brachycereus, Browningia, Brasilicereus, Calymmanthium, Carnegiea, Cephalocereus, Cephalocleistocactus, Cereus, Cintia, Cipocereus, Cleistocactus, Coleocephalocereus, Copiapoa, Corryocactus, Coryphantha, Dendrocereus, Denmoza, Discocactus, Disocactus, Echinocactus, Echinocereus, Echinopsis, Epiphyllum, Epithelantha, Eriosyce, Escobaria, Escontria, Espostoa, Espostoopsis, Eulychnia, Facheiroa, Ferocactus, Frailea, Geohintonia, Gymnocalycium, Haageocereus, Harrisia, Hatiora, Hylocereus, Jasminocereus, Lasiocereus, Leocereus, Lepismium, Leptocereus, Leuchtenbergia, Lophophora, Maihuenia, Malacocarpus, Mammillaria, Mammilloydia, Matucana, Melocactus, Micranthocereus, Mila, Monvillea, Myrtillocactus, Neobuxbaumia, Neolloydia, Neoraimondia, Neowerdermannia, Obregonia, Opuntia, Oreocereus, Oroya, Ortegocactus, Pachycereus, Parodia, Pediocactus, Pelecyphora, Peniocereus, Pereskia, Pereskiopsis, Pilosocereus, Polaskia, Praecereus, Pseudoacanthocereus, Pseudorhipsalis, Pterocactus, Pygmaeocereus, Quiabentia, Rauhocereus, Rebutia, Rhipsalis, Samaipaticereus, Schlumbergera, Sclerocactus, Selenicereus, Stenocactus, Stenocereus, Stephanocereus, Stetsonia, Strombocactus, Tacinga, Thelocactus, Turbinicarpus, Uebelmannia, Weberbauerocereus, Weberocereus, Yungasocereus
• Campanulaceae: Brighamia
• Capparidaceae: Maerua
• Caricaceae: Carica, Jacarathia
• Chenopodiaceae: Atriplex, Chenopodium, Dissocarpus, Einadia, Enchylaena, Eremophea, Halopeplis, Maireana, Malacocera, Neobassia, Osteocarpum, Rhagodia, Roycea, Halosarcia, Salicornia, Salsola, Sarcocornia, Sclerochlamys, Sclerolaena, Sueda, Tecticornia, Threlkeldia
• Cochlospermaceae
• Commelinaceae: Aneilema, Callisia, Cyanotis, Tradescantia, Tripogandra
• Convolvulaceae: Ipomea, Merremia, Stictocardia, Turbina
• Crassulaceae: Adromischus, Aeonium, Afrovivella, Aichryson, Bryophyllum, Cotyledon, Crassula, Cremnophila, × Cremnosedum, Dudleya, Echeveria, Graptopetalum, Hylotelephium, Hypagophytum, Kalanchoe, Lenophyllum, Meterostachys, Monanthes, Orostachys, Pachyphytum, Perrierosedum, Phedimus, Pistorinia, Prometheum, Pseudosedum, Rhodiola, Rosularia, Sedella, Sedum, Sempervivum, Sinocrassula, Thompsonella, Tacitus, Tylecodon, Umbilicus, Villadia
• Cucurbitaceae: Acanthosicyos, Apodanthera, Brandegea, Cephalopentandra, Ceratosanthes, Citrullus, Coccinia, Corallocarpus, Cucumella, Cucumis, Cucurbita, Cyclantheropsis, Dactyliandra, Dendrosicyos, Doyera, Eureindra, Fevillea, Gerrandanthus, Gynostemma, Halosicyos, Ibervilla, Kedostris, Lagenaria, Marah, Momordica, Neoalsomitra, Odosicyos, Parasicyos, Syrigia, Telfairia, Trochomeria, Trochomeriopsis, Tumamoca, Xerosicyos, Zehneria, Zygosicyos
• Didiereaceae: Alluaudia, Alluaudiopsis, Decaria, Didierea
• Dioscoreaceae: Dioscorea (geophytic succulent)
• Doryanthaceae: Doryanthes
• Ericaceae: Sphyrospermum
• Eriospermaceae: Eriospermum (geophyte)
• Euphorbiaceae: Cnidoscolus, Euphorbia, Jatropha, Monadenium, Pedilanthus, Synadenium
• Fabaceae: Delonix, Dolichos, Erythrina, Lotononis, Neorautanenia, Pachyrhizus, Tylosema
• Fouquieriaceae: Fouquieria
• Geraniaceae: Monsonia, Pelargonium (succulents and geophytes), Sarcocaulon
• Gesneriaceae: Aeschynanthus, Alsobia, Chirita, Codonanthe, Columnea, Nematanthus, Sinningia, Streptocarpus
• Hyacinthaceae (geophytes, a few succulent geophytes): Albuca, Bowiea, Daubenya, Dipcadi, Drimia, Drimiopsis, Eucomis, Hyacinthus, Lachenalia, Ledebouria, Litanthus, Massonia, Merwilla, Namophila, Ornithogalum, Polyxena, Pseudogaltonia, Pseudoprospero, Resnova, Rhadamanthus, Rhodocodon, Schizobasis, Schizocarphus, Spetaea, Urginea, Veltheimia, Whiteheadia
• Hypoxidaceae (geophytes): Empodium, Hypoxis, Pauridia, Saniella, Spiloxene
• Icacinaceae: Pyrenacantha (geophyte)
• Iridaceae (geophytes): Babiana, Chasmanthe, Crocosmia, Devia, Dierama, Dietes, Duthiastrum, Ferraria, Freesia, Geissorhiza, Gladiolus, Hesperantha, Ixia, Lapeirousia, Melasphaerula, Micranthus, Moraea, Pillansia, Radinosiphon, Romulea, Sparaxis, Syringodea, Thereianthus, Tritonia, Tritoniopsis, Watsonia, Xenoscapa
• Lamiaceae: Aeollanthus, Dauphinea, Perrierastrum, Plectranthus, Rotheca, Solenostemon, Tetradenia, Thorncroftia
• Lentibulariaceae
• Loasaceae: Schismocarpus
• Loranthaceae: Actinanthella, Agelanthus, Erianthemum, Helixanthera, Moquiniella, Oncocalyx, Pedistylis, Plicosepalus, Septulina, Tapinanthus, Vanwykia
• Melastomataceae: Medinilla
• Meliaceae: Entandrophragma
• Menispermaceae: Chasmanthera, Stephania, Tinospora
• Molluginaceae: Hypertelis
• Moraceae: Dorstenia, Ficus
• Moringaceae: Moringa
• Nolanaceae: Nolana
• Nolinaceae: Beaucarnea, Calibanus, Dasylirion, Nolina
• Orchidaceae subfamily Epidendroideae Phalaenopsis
• Orchidaceae (succulents) Acampe, Aerangis, Ansellia, Bolusiella, Bulbophyllum, Calanthe, Cyrtorchis, Oberonia, Polystachya, Tridactyle, Vanilla

(succulent geophytes) Eulophia, Liparis, Oeceoclades

(geophytes) Acroliphia, Bartholina, Bonatea, Brachycorythis, Brownleea, Centrostigma, Ceratandra, Corycium, Cynorkis, Didymoplexis, Disa, Disperis, Dracomonticola, Eulophia, Evotella, Gastrodia, Habernaria, Holothrix, Huttonaea, Neobolusia, Nervilia, Plicosepalus, Pachites, Platycoryne

• Oxalidaceae (geophytes): Oxalis
• Passifloraceae: Adenia
• Pedaliaceae: Holubia, Pterodiscus, Sesamothamnus, Uncarina
• Phyllanthaceae: Phyllanthus
• Phytolaccaceae: Phytolacca
• Piperaceae: Peperomia
• Poaceae: Dregeochloa
• Portulacaceae: Amphipetalum, Anacampseros, Avonia, Calyptrotheca, Ceraria, Cistanthe, Calandrinia, Dendroportulaca, Grahamia, Lewisia, Parakeelya (this name is not accepted by the Australian State and National Herbaria), Portulaca, Portulacaria, Schreiteria, Talinella, Talinum
• Rubiaceae: Anthorrhiza, Anthospermum, Hydnophythum, Hydrophylax, Myrmecodia, Myrmephythum, Phylohydrax, Squamellaria
• Ruscaceae: Cordyline, Dracaena, Sansevieria
• Sapindaceae: Erythrophysa
• Saxifragaceae
• Sterculiaceae: Brachychiton, Sterculia
• Urticaceae: Laportea, Obetia, Pilea, Pouzolzia, Sarcopilea
• Viscaceae: Viscum
• Vitaceae: Cissus, Cyphostemma
• Xanthorrhoeaceae: Xanthorrhoea
• Zygophyllaceae: Augea, Seetzenia, Zygophyllum

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:

[edit] External links

• Cacti & Succulent Picture Gallery
• Cactus and Succulent Field Number Database
• Plants of Southern Africa
• PlantZAfrica
• Australian Plant Names Index
• FloraBase - The Western Australian Flora

[edit] See also

Look up succulent in Wiktionary, the free dictionary.

• Cactus and Succulent Society of America