close up cactus spines

backdrop background barb barbed biology bloom blooming blossom botanical botany briar brier briery bur burr cactaceae cactaceous cactus closeup decoration decorative desert detail echinate exotic floral floriculture flower garden green grow growing growth herbal home image indoors macro nature perennial petals pike pistil plant pricker prickle screensavers spicule spikes spines texture thorn thornbush thorny trichome