what is a stipular spine
1 In many species, one stipular spine or a pair of stipular spines may be observed at each node, e.g., among legumes, and for legumes, the stipular spine is the typical type of shoot armature (Examples: coral tree, Chloroleucon, and a mimosa).tipule-like outgrowths may also be found at the base of leaflets on a compound leaf, in addition to stipules at the base of the petiole (rachis). Leaflet stipules are termed stipels or, less commonly, secondary stipules.