Buddleja sessiliflora, commonly known as Rio Grande butterfly-bush or tepozán, native to southern Arizona and the lower Rio Grande Valley of Texas in the United States[2] as well as much of central and northern Mexico excluding the Chihuahua Desert and Baja California Sur.

[3] The shrub grows in thorn savannah, forests, riparian zones, along roadsides and in disturbed areas from sea level to 2,800 m. The species was first named and described by Kunth in 1818.

[4][5] Buddleja sessiliflora is a trioecious shrub or small tree 1.5 – 5 m tall, the trunk reaching < 7 cm diameter, bark is yellow-brown in colour and fissured.

The young branches are subquadrangular, yellowish, the youngest sections tomentose.

The scent of the flowers is generally regarded as unpleasant, 'like ammonia but sweeter'.