Senegalia tenuifolia was abundant on finca Hamadryas near Ciudad Colon south of S. Jose. (N 09.91029, W 084.28731).
This species is a real creeper, sometimes covering the crown of small trees. It has many small scattered hooks on the twigs. The petiole is 1,5 cm long with a bulging gland on the lower part. The rachis is channeld, to 11,5 cm long, showing small hooks on the underside. The leaf has 15-24 pair of pinnae with appr. 50 leaflet-pairs per pinna. At the tip of the leaf is a 0,5 cm long thin mucro. I never found a blooming specimen. Only in one location I found old fruits beneath the tree.