unripe shell of the chestnut fruits,

hairy furry cactus balls sphere chestnut chinquapin acorn cup cupule cone acorncup botany fruits wild plant bushy exotic flora spiny prickly biting acanthoid acanthous barbed briery echinate lappaceous spiculate spinescent spinose spinous strigose thorned thorny bristling seta bristle danger pair two group set unripe shell urchin hedgehog green round decorative isolated cutout objects