Sap from a grape vine (Vitis vinifera). Sap within woody plants is carried upwards in xylem elements of the central stem. Grape vines have a high root pressure so that if stems are cut in early spring before leaves develop, the sap bleeds profusely, as here. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR JEREMY BURGESS)
Our website uses cookies. By using and navigating through the website and its offers, you accept these cookies. Detailed information about the use of cookies and how to delete them can be found in our data privacy statement.
