This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
AcaciaXanthophloeaSpines. Spines and emerging spring leaves of Acacia xanthophloea The spines of African Acacias such as this are modified stipules Note the emerging stipules beginning to form spines and the older hardened spines at the bases of shoots own JeanGeilland Public domain Acacia xanthophloea Spines botany JeanGeilland