United States, Texas, Jim Wells, S end of N-S runway at Naval Auxiliary Landing Field Orange Grove, ca. 2.2 airmiles E to ESE of jct. US Rt. 281 and Co. Rd. 220, at N27o53'00.6", W098o03'05.9". San Diego NE Quadrangle.
27.8835 -98.05164
Common in fallow corn field on deep, well drained, moderately alkaline loam (Clareville Series, Pachic Argiustolls) on level to gently sloping upland underlain by calcareous sandstone of the Lissie Formation. Associates include Aphanostephus ramosissimus, Cenchrus spini-fex, Convolvulus equitans, Cynodon dactylon, Eupatorium incar-natum, E. odoratum, Helianthus annuus, Ipomoea cordatotriloba, Linum sp., Oxalis dillenii, Parthenium hysterophorus, Pyrrhopappus pauciflorus, Ratibida columnifera, Salvia coccinea, Sarcostemma cynanchoides, Solanum elaeagnifolium, Sorghum halepense, Teucrium cubense, Verbesina microptera.