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Term Definition
Ray A radial band of tissue in the wood of vascular plants that allows movement of water, nutrients, and photosynthate in stems and trunks; in Cyperaceae, a secondary axis of a compound inflorescence; in Solanum (Solanaceae), a division of a stellate hair.
Ray flower A zygomorphic flower with a straplike corolla found in Asteraceae. Compare with disk flower. A medial section of a capitulum (head) of a species of Asteraceae. Drawing by B. Angell.