Devil's Horsewhip
Achyranthes aspera Linnaeus var. pubescens (Monquin-Tandon) C.C. Townsend
Devil's Horsewhip: https://marylandbiodiversity.com/species/16283
Synonyms
Achyranthes aspera var. obtusifolia  Centrostachys aspera  Centrostachys indica  Rough Chaff-flower 

Source: Wikipedia

Wikipedia content unavailable for this taxon.