Other names: Hammerwort
Scientific names: Parietaria pensylvanica Muhl. ex Willd.
Description: A cool-season annual commonly found in lawns and roadsides throughout South Texas. In no-till and strip-till fields, this weed poses a significant problem in the spring, unless effectively controlled by residual herbicides applied in the fall/winter or burndown herbicides prior to planting.
Leaves: Simple, alternate, lanceolate in shape, with entire margins. Pubescent along margins with some pubescence on leaf surfaces.
Inflorescence: Flowers unisexual (separate male and female flowers) in axillary clusters
Seed: A shiny brown achene