Balm of Gilead (Cedronella canariensis) stem
Rosa thorns
Holly (Osmanthus heterophyllus)
Barberry (Berberis vulgaris) branch and berries
Ripe sloes (Prunus spinosa)
Wind sculpted hawthorn tree (Crataegus monogyna)
Sea holly
Blessed thistle (Cnicus benedictus)
Gorse (Ulex europaeus), Pembrokeshire, Wales, UK
Bramble stem, foliage and root system
Mahonia aquifolium 'Apollo'
Spurge (Euphorbia canariensis)
Raptor perched in the top of a thorny acacia tree
Ceiba;name of a genus of many species of large trees found in tropical areas;including Mexico;Guatemala;Central and South America
Calliandra haematocephala
Polaskia chichipe cactus
Thorn apple on white background
Thornapple seeds
Thorn apple seed pod
Lemon balm, SEM
Century plant leaves
Rose thorns
Fox-tail agave (Agave attenuata)
Golden-bell (Forsythia suspensa) flowers
Alluaudia procera spines and leaves
Alluaudia procera tree
Cactus spines
Cactus plants
Cactus plant
Honey locust thorn
Four roses, X-ray
Robin's pincushion galls
French lavender (Lavandula dentata)
Dogwood (Cornus alba 'Baton Rouge')
Parodia herteri cactus
Cactus in flower
Centaurea sphaerocephala flower
Sweet chestnut
Close-up of cactus plant, Yelapa, Jalisco, Mexico
Agave Plant
Aloe vera
Houseleek (Sempervivum 'Blue Boy')
Houseleek (Sempervivum montana)
Blue Agave (Agave tequilana)
Bramble (Rubus sp.) branch, X-ray
Beech (Fagus sylvatica)
Acacia karoo thorns
Mountain sumac (Rhus copallina)
Acacia thorns
Castor oil fruits (Ricinus communis)
Teasel flower head
Pineapples (Ananas comosus)
Thorn apple (Datura stramonium) seed pod
Sea holly (Eryngium giganteum)
Daisy flower, fluorescent light micrograph
Honey locust thorn, light micrograph
Balloon milkweed
Lilac (Syringa vulgaris) leaves and flowers
Rosemary (Rosmarinus officinalis)
Rose of Sharon (Hibiscus syriacus)
Peony (Peony lactiflora 'Baroness Schroeder')
Mammillaria zeilmanniana
Mammillaria spinosissima in flower
Puncture vine (Tribulus terrestris)
Leaf oil glands, SEM
Stinging nettle leaf, SEM
Sage leaf, SEM
Rosemary, SEM
Blackberries (Rubus fruticosus)
Venus flytrap (Dionaea muscipula)
Venus flytrap leaves, SEM
Carnivorous plant leaf scales, SEM
Alluaudia procera leaves
Holly leaves
Goosegrass leaf, SEM
Venus flytrap leaf, SEM
Sweet chestnuts (Castanea sativa)
Didieriaceae thorns
Chilean Rhubarb (Gunnera manicata)
Fresh green succulent plants in garden
Cactus against a clear blue sky
Thorny plant stalk
Close-up of thorns on a spiked plant, San Miguel de Allende, Guanajuato, Mexico
Close-up of cactus
Saguaro cactus
Cactus plant spines
Cactus
Cacti
Prickly pear cactus, Opuntia ficus-indica
Prickly pear cactus (Opuntia sp.)
Cacti garden
Flowering cactus (Cleistocactus sepium)
Thistle flower
Teasel seed head
Prickly pears (Opuntia ficus-indica)
Gymnocalycium stenopleurum cactus
Gymnocalcyium horstii cactus
Mammillaria geminispina cactus
Parodia cactus and succulents
Eryngium 'Dove Cottage Hybrid'
Euphorbia officinarum subsp. echinus
Slender candelabra euphorbia (Euphorbia avasmontana)
Succulent spiny spurge (Euphorbia grandicornis)
Eryngium x tripartitum flowers
Cactus Facheiroa ulei abstract
Pochote tree (Pachira quinata), Oaxaca, Mexico
Teasel (Dipsacus sylvestris)
American sweetgum (Liquidambar styraciflua) fruit
London plane (Platanus ラ hispanica) fruit
Cactus, Epithelantha micromeris
Peacock butterfly caterpillars
Cactus (Winterocereus aureispina)
Dried teasel abstract
Carline thistle
Orange Pyracantha berries
Rosa 'Pink Tiara'
Cabbage thistle (Cirsium oleraceum)
Sea buckthorn (Hippophae rhamnoides)
Rattan palm
South African porcupine
Acacia flowers (Acacia karoo)
Purple sage (Salvia officinalis Purpurascens)
Prickly pear (Opuntia ficus-indica)
Purple anise (Illicium floridanum)
Barberries and leaves
Arnica angustifolia
Dog rose (Rosa canina)
Bearberry (Arcostaphylos uva-ursi)
Cannabis plant, SEM
Tobacco (Nicotiana alata) leaf, SEM
Notocactus leninghausii
Christ's thorn (Phalacrocorax carbo)
Witches' broom gall
Love in the mist seed head (Nigella sp.)
Wind sculpted tree.
Sage leaf trichomes, SEM
Yarrow flower petal, SEM
Comfrey flower petal, SEM
White Tipped Agave Plant, Kenya
Aloe vera flowers
Stachys recta calyx, light micrograph
Sceptrum banksia (Banksia sceptrum)
Crown of thorns
Angelical stem, UV fluorescence micrograph
Close up of thorns of plant from agave species