Pericome caudata is the primary species present, sometimes joined by 'strays' from adjacent communities. 1997 for associations currently described for the southeastern United States. Unconsolidated material sparse vegetation. Dunes with sparse herbaceous vegetation VII.C.1.N.a.010. This alliance is known from sparsely vegetated quartz sand dunes in the eastern Trans-Pecos of Texas.
Known examples have sparse vegetation consisting primarily of annuals.
Most abundant species include Heliotropium convolvulaceum, Psoralidium lanceolatum, Polanisia jamesii, Helianthus petiolaris, Helianthus neglectus, Panicum havardii, Euphorbia carunculata, and Mentzelia sp. This vegetation varies a great deal from year to year, depending on moisture. The name and circumscription of this alliance may be changed as further data are available. 1997 for associations currently described for the southeastern United States. This alliance is known from riverside quartz sand dunes along the Rio Grande River in Trans-Pecos Texas in the vicinity of Boquillas.