United States, Texas, Cameron, Laguna Atascosa Nat'l WLR.
2 mi. S of entrance to Unit 1, on primitive rd. to S from main rd. Roadside under dense scrub. Gray, clayey silt, very hard. Celtis spin.-Cereus sp.-Zizyphus sp. complex. Annual herb, 15-20 cm. Sprawling on ground, ultimate branches weakly upright. Lavender corolla.