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Valentine.gr  

August 2012


Did you know that Lithops is a stony shaped plant that uses camouflage as a means of protection and for that reason carry the nicknames of "living stones" and "pebble plants"?

Living Stones (Lithops spp.)

Lithops -  Living Stones - Lithops spp.

Lithops is a genus of succulent plants in the ice plant family, Aizoaceae. Members of the genus are native to southern Africa. The name is derived from the Ancient Greek words ëßèïò (lithos), meaning "stone," and ïø (ops), meaning "face," referring to the stone-like appearance of the plants. They avoid being eaten by blending in with surrounding rocks and are often known as pebble plants or living stones.

Although it is hard to imagine, the body of a lithops is in fact a pair of leaves that have evolved to efficiently retain whatever moisture becomes available to the plant. In some areas of their habitat rainfall may not occur for many months so conservation of water is of prime importance.

To minimise any evapouration the leaves have become so truncated that they have lost the appearance of a normal leaf and have become rounded like a pebble.

This has helped to make them less obvious to foraging animals so the plants that best mimic the colour and appearance of the soil and stones of their surroundings stand the best chance of survival. This in turn has led to the evolution of different species and varieties.

Individual Lithops plants consist of one or more pairs of bulbous, almost fused leaves opposite to each other and hardly any stem. The slit between the leaves contains the meristem and produces flowers and new leaves. The leaves of Lithops are mostly buried below the surface of the soil, with a partially or completely translucent top surface or window allowing light to enter the interior of the leaves for photosynthesis.

During winter a new leaf pair, or occasionally more than one, grows inside the existing fused leaf pair. In spring the old leaf pair parts to reveal the new leaves and the old leaves will then dry up. Lithops leaves may shrink and disappear below ground level during drought. Lithops in habitat almost never have more than one leaf pair per head, the environment is just too arid to support this. Yellow or white flowers emerge from the fissure between the leaves after the new leaf pair has fully matured, one per leaf pair. This is usually in autumn, but can be before the summer equinox in L. pseudotruncatella and after the winter equinox in L. optica. The flowers are often sweetly scented.

The most startling adaptation of Lithops is the colouring of the leaves. The leaves are not green as in almost all higher plants, but various shades of cream, grey, and brown, patterned with darker windowed areas, dots, and red lines. The markings on the top surface disguise the plant in its surroundings.

Lithops are obligate outcrossers and require pollination from a separate plant. Like most mesembs, Lithops fruit is a dry capsule that opens when it becomes wet; some seeds may be ejected by falling raindrops, and the capsule re-closes when it dries out. Capsules may also sometimes detach and be distributed intact, or may disintegrate after several years.

Lithops are popular novelty house plants and many specialist succulent growers maintain collections. Seeds and plants are widely available in shops and over the Internet. They are relatively easy to grow if given sufficient sun and a suitable well drained-soil.

Normal treatment in mild temperate climates is to keep them completely dry during winter, watering only when the old leaves have dried up and been replaced by a new leaf pair. Watering continues through autumn when the plants flower and then stopped for winter. The best results are obtained with additional heat such as a greenhouse. In hotter climates Lithops will have a summer dormancy when they should be kept mostly dry, and they may require some water in winter. In tropical climates, Lithops can be grown primarily in winter with a long summer dormancy. In all conditions, Lithops will be most active and need most water during autumn and each species will flower at approximately the same time.

Lithops thrive best in a coarse, well-drained substrate. Any soil that retains too much water will cause the plants to burst their skins as they over-expand. Plants grown in strong light will develop hard strongly coloured skins which are resistant to damage and rot, although persistent overwatering will still be fatal. Excessive heat will kill potted plants as they cannot cool themselves by transpiration and rely on staying buried in cool soil below the surface.

Propagation of Lithops is by seed or cuttings. Cuttings can only be used to produce new plants after a plant has naturally divided to form multiple heads, so most propagation is by seed. Lithops can readily be pollinated by hand if two separate clones of a species flower at the same time, and seed will be ripe about 9 months later. Seed is easy to germinate, but the seedlings are small and vulnerable for the first year or two, and will not flower until at least two or three years old.

The first scientific description of a Lithops was made by William John Burchell, explorer of South Africa, botanist and artist, although he called it Mesembryanthemum turbiniforme. In 1811 he accidentally found a specimen when picking up from the ground a "curiously shaped pebble". Unfortunately his description isn't detailed enough to be sure which Lithops he had discovered and the name Lithops turbiniformis is no longer used, although for many years it was applied to what is now known as Lithops hookeri.

Several more Lithops were published as Mesembryanthemum species until in 1922 N E Brown (Nicholas Edward Brown) started to split up the overly large genus on the basis of the capsules. The genus Lithops was created and dozens more species were published in the following decades. Brown, Gustav Schwantes, Kurt Dinter, Gert Nel, and Louisa Bolus continued to document Lithops from across southern Africa, but there was little consensus on the relationships between them, or even which populations should be grouped as species. As recently as the 1950s, the genus was little known in cultivation and not well understood taxonomically.

In the 1950s, Desmond and Naureen Cole began to study Lithops. They eventually visited nearly all habitat populations and collected samples from approximately 400, identifying them with the Cole numbers which have been used ever since and distributing Cole numbered seed around the world. They studied and revised the genus, in 1988 publishing a definitive book (Lithops: Flowering Stones) describing the species, subspecies, and varieties which have been accepted ever since.

New species continue to be discovered steadily in remote regions of Namibia and South Africa, most recently L. coleorum in 1994, L. hermetica in 2000, and L. amicorum in 2006.

After flowering in the fall and extending through winter, when the new 'bodies' are forming within the old leaves, the latter become soft and flaccid and begin to shrivel. Some may split on the sides from the pressure of the new body inside, and often there will be dry or 'dead' spots on the old leaves at this stage. This is perfectly normal. Eventually the old leaves dry up, leaving the plant with a perfect set of new ones.


Source:
http://en.wikipedia.org/wiki/Lithops 
http://www.lithop.supanet.com/

 

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Green birdflower - Crotalaria cunninghamii
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Indian plum - Flacourtia jangomas
Apple of Sodom - Calotropis procera
Silver Vine - Actinidia polygama
Yerba Mansa - Anemopsis californica
Tree of Death - Manchineel - Hippomane mancinella
Dove Tree - Davidia involucrata
Ashwagandha - Winter Cherry - Withania somnifera
Zabala - Lardizabala biternata
Longan - Dimocarpus longan
Flame tree - Delonix regia
Ïrchid tree - Bauhinia variegata
Pink Lapacho - Handroanthus impetiginosus
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Golden Himalayan raspberry - Rubus ellipticus
Flame Thrower Palm - Chambeyronia macrocarpa
Toothbrush tree - Mustard tree - Salvadora persica
Monastery bamboo - Thyrsostachys siamensis
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Candelabra tree - Euphorbia ingens
Shea butter tree - Vitellaria paradoxa
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Tree of Damocles - Oroxylum indicum
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Albany pitcher plant - Cephalotus follicularis
Nipa palm - Nypa fruticans
Marmalade Box - Genipa americana
Ice Cream Bean - Inga edulis
Gular - Cluster fig - Ficus racemosa
Kei apple - Dovyalis caffra
Stork's Bill - Erodium cicutarium
Camu Camu - Myrciaria dubia
Pemphis - Pemphis acidula
Sisal - Agave sisalana
Jute Mallow - Corchorus olitorius
Sugar Apple - Annona squamosa
Sapodilla - Manilkara zapota
Black Sapote - Diospyros nigra
Star Apple - Chrysophyllum cainito
White Ginger Lily - Hedychium coronarium
Yuzu - Citrus junos
Wild Loquat - Sugar Plum - Uapaca kirkiana
Tonka - Cumaru - Dipteryx odorata
Chinese bayberry - Myrica rubra
Wood Apple - Limonia acidissima
Açaí - Euterpe oleracea
Tindola - Ivy gourd - Coccinia grandis
Blue honeysuckle - Haskap - Lonicera caerulea
Balata - Manilkara bidentata
Calabash nutmeg - Monodora myristica
Allanblackia
Kola nut - Cola nitida
Rainbow eucalyptus - Eucalyptus deglupta
Elephant apple - Dillenia indica
Australian Christmas tree - Nuytsia floribunda
Honeywort- Cerinthe major
Aconite - Monkshood - Wolfsbane - Aconitum napellus
Crown of Thorns - Euphorbia milii
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Goldenrain Tree - Koelreuteria paniculata
Naranjilla - Lulo - Solanum quitoense
Brazil nut tree - Bertholletia excelsa
Sea grape - Coccoloba uvifera
Bignay - Antidesma bunius
Cashew - Anacardium occidentale
Giant Himalayan Lily - Cardiocrinum giganteum
African Hemp - Sparrmannia africana
Lychee - Litchi chinensis
Prickly Heath - Gaultheria mucronata
Hoodia - Bushman's hat - Hoodia gordonii
Cannibals Tomato - Solanum viride
Ashoka - Saraca asoca
Ackee - Blighia sapida
African plum - Safou - Dacryodes edulis
Solandra - Solandra maxima
Stapelia - Stapelia gigantea
Foxglove - Digitalis purpurea
Swiss Cheese Plant - Monstera deliciosa
Chocolate flower - Berlandiera lyrata
Sandersonia - Sandersonia aurantiaca
Northern Japanese Magnolia - Magnolia kobus
Champak - Magnolia champaca
Hooker’s lips - Psychotria elata
Suicide Tree - Cerbera odollam
Konjac - Amorphophallus konjac
Madagascar ocotillo - Alluaudia procera
Water Banana - Typhonodorum lindleyanum
Salak - Salacca zalacca
Natal Plum - Carissa macrocarpa
Ashanti blood - Mussaenda erythrophylla
Duranta - Duranta erecta
Maqui - Aristotelia chilensis
Manuka - New Zealand Tea Tree - Leptospermum scoparium
Suriname cherry - Eugenia uniflora
Australian Finger Lime - Citrus australasica
Sacred Flower of the Incas - Cantua buxifolia
Job's tears - Coix Lacryma-jobi
Velvet Bean - Mucuna pruriens
Java Apple - Syzygium samarangense
Screwpine - Pandanus utilis
Marimo - Aegagropila linnaei
Achocha/Caigua - Inca cucumber - Cyclanthera pedata
Rubber Tree - Hevea brasiliensis
Sugar cane - Saccharum officinarum
Sacha inchi - Plukenetia volubilis
Coffea - Coffee Tree - Coffea arabica
Liquorice - Licorice - Glycyrrhiza glabra
Mullein -Verbascum thapsus
Iceplant - Mesembryanthemum crystallinum
Chayote - Sechium edule
Roselle - Hibiscus sabdariffa
Black Goji - Lycium ruthenicum Murray
Rose Cactus - Pereskia grandifolia
Durian - Durio zibethinus
Jackfruit tree - Artocarpus heterophyllus
Cassabanana - Sicana odorifera
Chilean myrtle - Arrayan - Luma apiculata
Kurrajong - Brachychiton populneus
Rice-paper Plant -Tetrapanax papyrifer
Shell Ginger - Alpinia zerumbet
Harlequin Glorybower - Clerodendrum trichotomum
Coco de Mer - Lodoicea maldivica
Silver Tree - Leucadendron argenteum
Buffaloberry - Shepherdia argentea
Himalayan Honeysuckle - Leycesteria formosa
Raisin Tree - Hovenia dulcis
Borojo - Alibertia patinoi - Borojoa patinoi
Butterfly Pea - Clitoria ternatea
Honey Flower - Melianthus major
Ombu - Phytolacca dioica
Lion's Ear - Wild Dagga - Leonotis leonurus
Moringa - Miracle Tree - Moringa oleifera
Sea Daffodil - Pancratium maritimum
Spear Lily - Gymea - Doryanthes
Camphor tree - Cinnamomum camphora
Waterwheel - Aldrovanda vesiculosa
Flowering rush - Butomus umbellatus
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Dead Man’s Fingers - Decaisnea
Bitter Melon - Momordica charantia
Shoapnuts Tree - Shoapberry - Sapindus
Acerola - Malpighia
Monkey Ladder - Sea Heart - Entada gigas
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Caper - Capparis spinosa
Lithops - Living Stones
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Chilean Lantern Tree - Crinodendron hookerianum
Parrot's Beak - Lotus berthelotii
Water Hyacinth - Eichhornia crassipes
Guaiac Tree - Guaiacum officinale - Lignum-vitae
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Cow's Udder - Solanum mammosum
Miracle fruit - Synsepalum dulcificum
Akebia - Akebia quinata
Chilean Firebush - Embothrium coccineum
Caesalpinia - Caesalpinia pulcherrima
Welwitschia - Welwitschia mirabilis
Saguaro - Carnegiea gigantea
Schisandra - Schisandra chinensis
Monarda - Bee balm - Bergamot
Tamarind - Tamarindus indica
Neomarica - Walking Iris
Red hot poker - Kniphofia - Tritoma
Sikkim rhubarb - Rheum nobile
Reseda - Mignonette
Paulownia - Paulownia tomentosa
Belamcanda chinensis - Leopard lily
Blue Poppy - Meconopsis
Cannonball Tree - Couroupita guianensis
Tamarillo - Cyphomandra betacea
Goji - Wolfberry - Lycium barbarum
Vanilla - Vanilla Planifolia
Stevia - Stevia rebaudiana
Pachypodium
Physalis
Ceropegia
Sturt pea - Swainsona formosa
Clematis
Grevillea
Jade vine - Strongylodon macrobotrys
Sansevieria - Snake Plant
Trochetia
Yareta - Azorella compacta
African tulip tree - Spathodea campanulata
Angel's Trumpets - Brugmansia
Achiote - Annato - Bixa orellana
Sausage Tree - Kigelia pinnata
Castor Oil Plant - Ricinus communis
Firewheel Tree - Stenocarpus sinuatus
Bat Flower - Tacca
Snake gourd - Trichosanthes cucumerina
Sedum
Hydnora - Hydnora africana
Pickerel Weed - Pontederia
Argan - Argania spinosa
Astilbe - False Goats Beard
Feijoa - Pineapple Guava - Acca sellowiana
Aquilegia - Columbine
Cassiope
Sweet Box - Sarcococca
Christmas Cactus - Schlumbergera
Foxtail Lily - Eremurus
Rue - Ruta graveolens
Pittosporum
Ylang-Ylang - Cananga odorata
Rose of Jericho - Anastatica hierochuntica
Gunnera
Waterlily - Nymphaea
Calico Flower - Aristolochia
Daylily - Hemerocallis
Contorted hazel - Corylus avellana Contorta
Torch Ginger - Etlingera elatior
Mistletoe - Viscum album
Devil´s claw - Harpagophytum procumbens
Teasel - Dipsacus
Pampas grass - Gynerium argenteum - Cortaderia Selloanna
Purple coneflower - Echinacea purpurea
Coral Tree - Erythrina crista-galli
Portulaca
Lobelia
Field Poppy - Papaver Rhoeas
Narcissus - Daffodil
Mimosa pudica - Sensitive Plant
Boxwood - Buxus sempervirens
Firethorn - Pyracantha
Star of Bethlehem - Ornithogalum
Cosmos
Muscari - Grape Hyacinth
Papyrus - Cyperus papyrus
Zinnia
Honeysuckle - Lonicera
Passiflora - Passion Flower
Calendula - Marigold
Lupine - Lupinus
Canna - Indian Shot
Witch Hazel - Hamamelis
Oak - Quercus
Brunsvigia - Candelabra Flower
Tree peony - Paeonia suffruticosa
Olive - Olea europaea
Cornflower - Centaurea cyanus
Desert rose - Adenium obesum
Oleander - Nerium Oleander
Abutilon
Sweet Pea - Lathyrus odoratus
Chaenomeles - Flowering Quince
Forsythia
Amaryllis - Hippeastrum
Butchers broom - Ruscus aculeatus
Bay Laurel - Laurus nobilis
Gloriosa
Bamboo
Gladiolus
Artichoke - Cynara scolymus
Clivia - Clivia Miniata
Dipladenia - Dipladenia sanderii
Date palm - Phoenix dactylifera
Peach - Prunus persica
Almond - Prunus amygdalus
Willow - Salix
Pomegranate - Punica granatum
Protea cynaroides
Colchicum autumnale
Bird of Paradise - Strelitzia reginae
Cardon - Pachycereus pringlei
Wolffia arrhiza
Puya raimondii
Fuchsia
Asphodelus - Asphodel
Primula - Primerose
Dicentra spectabilis - Bleeding Heart
Edelweiss - Leontopodium alpinum
Helleborus Niger - Christmas Rose
Zantedeschia - Calla Lily
Fritillaria imperialis - Crown imperial
Aster
Heliconia
Common Sunflower - Helianthus annuus
Bee Orchid - Orphys apifera
Convalaria majalis - Lily of the Valley - Muguet
Syringa Vurgaris - Lilac
Viola
Impantiens
Snowdrop - Galanthus
Poinsettia - Euphorbia pulcherrima
Dionaea muscipula
Banksia
Sea anemone
Amorrhophallus titanum
Rafflesia arnoldi

 

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