United States, Texas, Presidio, Chinati Mtns. State Natural Area. Indian Spring Creek.
29.88139 -104.56889
Broad, brushy arroyo with fine-grained buff-colored sand and gravel. Associates include Salix, Prosopis glandulosa, Baccharis, Tamarix, Brickellia californica, Hymneoclea, and Chilopsis. Erect annual 40 m. tall in gravel and sand arroyo. Ray flts white. Disk pale greenish white.