Blacklocust (Robinia pseudoacacia)
Blacklocust twigs display alternate leaf arrangement. The buds are hidden beneath the leaf scars, and saplings produce paired stipular spines.
![](https://ohioplants.org/wp-content/uploads/2017/09/Robinia-pseudoacacia-twig.jpg)
Blacklocust twig with stout stipular spines.
The production of spine is a variable feature; tall old trees lack them.
![](https://ohioplants.org/wp-content/uploads/2017/09/Robinia-pseudoacacia-twigs.jpg)
Blacklocust twigs with and without stout stipular spines.