Blessed thistle (Cnicus benedictus)
Sea holly
Cabbage thistle (Cirsium oleraceum)
Thistle flower
Spear thistle flower
Carline thistle
Balm of Gilead (Cedronella canariensis) stem
Castor oil fruits (Ricinus communis)
Sea holly (Eryngium giganteum)
Thorn apple seed pod
Rose thorns
Fox-tail agave (Agave attenuata)
Spear thistle (Onopordum sp.)
Cotton thistle (Onopordum acanthium)
Holly leaves
Thornapple seeds
Century plant leaves
Spear thistle (Cirsium vulgare)
Acacia flowers (Acacia karoo)
Centaurea sphaerocephala flower
Thorn apple (Datura stramonium) seed pod
Polaskia chichipe cactus
Acacia thorns
Cactus spines
Honey locust thorn
Puncture vine (Tribulus terrestris)
Thistle, extreme close-up
Stachys recta calyx, light micrograph
Goosegrass leaf, SEM
Flowering cactus (Cleistocactus sepium)
Mammillaria zeilmanniana
Flowering cactus plant
Flower pollen
Cactus Facheiroa ulei abstract
Dried teasel abstract
Carline thistle (Carlina vulgaris)
Venus flytrap leaf, SEM
Venus flytrap (Dionaea muscipula)
Alluaudia procera spines and leaves
Yarrow flower petal, SEM
Sweet chestnut
Comfrey flower petal, SEM
Leaf oil glands, SEM
Ceiba;name of a genus of many species of large trees found in tropical areas;including Mexico;Guatemala;Central and South America
Spurge (Euphorbia canariensis)
Cactus plants
Cactus plant
Teasel flower head
Pineapples (Ananas comosus)
Aloe vera flowers
Wind sculpted hawthorn tree (Crataegus monogyna)
Teasel seed head
Sunflower pollen, SEM
Carnivorous plant leaf scales, SEM
Alluaudia procera leaves
Alluaudia procera tree
Aloe vera
Bramble stem, foliage and root system
Blue Agave (Agave tequilana)
Thistle
Slender candelabra euphorbia (Euphorbia avasmontana)
Holly (Osmanthus heterophyllus)
Houseleek (Sempervivum montana)
Bramble (Rubus sp.) branch, X-ray
Gorse (Ulex europaeus), Pembrokeshire, Wales, UK
Houseleek (Sempervivum 'Blue Boy')
Thistle, cropped
Stinging nettle leaf, SEM
Sage leaf, SEM
Lemon balm, SEM
Chilean Rhubarb (Gunnera manicata)
Rosa thorns
Teasel (Dipsacus sylvestris)
Cactus in flower
Prickly pear cactus, Opuntia ficus-indica
Plant trichome, light micrograph
Beech (Fagus sylvatica)
Sweet chestnuts (Castanea sativa)
Tobacco (Nicotiana alata) leaf, SEM
Balloon milkweed
Close-up of cactus plant, Yelapa, Jalisco, Mexico
Venus flytrap leaves, SEM
Rosemary, SEM
Marigold pollen grain, SEM
Common ragweed pollen, SEM
Sea holly (Eryngium sp.)
Parodia herteri cactus
Gymnocalycium stenopleurum cactus
Eryngium 'Dove Cottage Hybrid'
Eryngium x tripartitum flowers
Mammillaria spinosissima in flower
Cactus (Winterocereus aureispina)
Close-up of thorns on a spiked plant, San Miguel de Allende, Guanajuato, Mexico
Didieriaceae thorns
Robin's pincushion galls
Cactus plant spines
Star cactus (Astrophytum ornatum)
Cacti
Echinopsis smrziana
Prickly pear cactus (Opuntia sp.)
Mammillaria geminispina cactus
Euphorbia officinarum subsp. echinus
Pochote tree (Pachira quinata), Oaxaca, Mexico
Ripe sloes (Prunus spinosa)
Fresh green succulent plants in garden
Acacia karoo thorns
Orchid petal, ESEM
Orchid petal, SEM
Pansy petal, SEM
Petal trichomes, SEM
Rapeseed flower petal, SEM
Pansy flower petal, SEM
Sage leaf trichomes, SEM
Cherry laurel (Prunus laurcocerasus)
Prickly pear (Opuntia ficus-indica)
Bee sting
Thistle husk
Spiny bush cricket
Agave Plant
Lava cactus
Arnica pollen grain, SEM
Marsh mallow pollen, SEM
Sceptrum banksia (Banksia sceptrum)
Four roses, X-ray
Bay laurel flower petal, SEM
Snapdragon flower petal, SEM
Flower petal, SEM
Love in the mist seed head (Nigella sp.)
Veronicastrum virginicum 'Fascination'
Astilbe chinensis 'Purpurlanze'
Showy foxtail (Ptilotus exaltatus)
Lythrum salicaria 'Fire Candle'
Orchid primrose (Primula vialii) flowers
Close up of thorns of plant from agave species
Saguaro cactus
Cactus
Cleistocactus cactus
Cacti garden