Dicot stem. Helianthus (sunflower) vascular bundles (ring), phloem, xylem, pith cortex, epidermis. 10x at 35mm. Vascular bundles arranged in a ring. Organization of primary tissues. [Getty Images]

Dicot stem. Helianthus (sunflower) vascular bundles (ring), phloem, xylem, pith cortex, epidermis. 10x at 35mm. Vascular bundles arranged in a ring. Organization of primary tissues.

Photolibrary Ed Reschke