single yellow sea urchin coryphantha radians cactus flower

background ball beast beauty bizarre black botany cactaceae cacti cactus center closeup collection collector container contradiction contrast copy coryphantha cylindrical dangerous detailed diameter eight flower gardening harshness hobby horticulture irridescent macro one pallida parts patio petals plant potted radians red reduncispina rhinoceos rhinoceros sea seaurchin sepals sharp sharpness shimmering single softness space spines stamens stigma structure succulent thorns top ugliness unique unusual urchin vicious yellow