United States, Texas, Cameron, Middle bridge in the Resaca Park, Brownsville.
25.901747 -97.497484 +-10000m.
Distributed in South Texas, an erect annual herb on open ground and fields, etc., sandy loam soil. Flowers white, in a terminal corymb, odorless. Leaves are very finely dissected, lace-like. Fruit in clusters of small capsules, bark green, roots fibrous. Frequent throughout this region. Sometimes covering large areas.