Scleranthus perennis  
Family: Caryophyllaceae
perennial knawel
Scleranthus perennis image
Robert W. Freckmann  
Etymology: Scleranthus: from Greek scleros, "hard," and anthos, "flower," from the extremely hard hypanthium or calyx tube
Plants: spreading perennial, up to 6" tall forb; stems with many forks
Leaves: opposite, growing together at the base, linear
Flowers: greenish, tiny, 5-parted, mostly stalkless, no petals, sepals rounded with conspicuous white borders; inflorescence a tight, branched clusters; blooms June-Sept.
Habitat: disturbed areas
Scleranthus perennis image
Emmet J. Judziewicz  
Scleranthus perennis image
Merel R. Black  
Scleranthus perennis image
Robert W. Freckmann  
Scleranthus perennis image
Merel R. Black