The thickness of sapwood is some indication of how long a growth ring of wood is able to function. Look at Table 8-3. About how long does wood of catalpa function? How about wood of wild black cherry or honey locust?

Table 8-3

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TABLE 8-3 Thickness of Sapwood in Eudicot Trees Catalpa speciosa (catalpa) Robinia pseudoacacia (black locust) Juglans cinerea (butternut) Maclura pomifera (Osage orange) Sassafras officinale (sassafras) Aesculus glabra (Ohio buckeye) Juglans nigra (black walnut) Prunus serotina (wild black cherry) Gleditsia triacanthos (honey locust) Number of Xylem Rings in Sapwood 1-2 2-3 5-6 5-10 7-8 10-12 10-20 10-12 10-12