Fig. 17
From: The adjustment of China endemic Heptacodium miconioides Rehd. to temperate zone of Poland
Longitudinal radial section of the 1-year stem H1 in Heptacodium myconioides. Designations: an – annular thickening of metaxylem; gr – gradual vessel tail, scalariform thickening and plate (arrow); me—metaxylem vessel; pp – simple pitted vessel; px – protoxylem; sc – scalariform thickening of metaxylem vessel; sh – helical / spiral thickening of protoxylem vessel; sp – simple plates (arrow); tr – tracheids; ve – secondary xylem vessel. Scale bar 100 µm