This species has not been reported previously from the barrier island of Tamaulipas.
This subspecies is presumably confined in distribution to the barrier island of Tamaulipas.
He did not visit the barrier island or the Laguna Madre de Tamaulipas.
Dr. Marshall Johnston kindly identified specimens of plants from the barrier island.
Any low sandy island that is parallel to the mainland and protects it from storms. (See Cape Hatteras.)
Note: Barrier islands normally change location every ten to thirty years, a fact that makes coastline management a major problem in environmental policy.