close up of slender thistle carduus tenuiflorus flower; blurred background; east san francisco bay area, california

america area background barb bay bloom blooming blurred botany bright california carduus close closeup color colors copy detail detailed east flora floral flower francisco garden green head herb herbal macro magenta medicine natural nature outdoors petal plant pricker purple san sharp single slender space spiked spring states tenuiflorus thistle thorn united vibrant violet vivid weed wild wildflower