W20 



BALLHEAD SANDWORT 



Arena'ria conges' ta 



Flowers white, in congested, terminal, 

 bracted heads 



Petals 5, about % in. long, entire, 

 oblong, about twice as long as the 5, 

 thin, dry, whitish, strongly keeled, 

 outer flower parts (sepals) 



Stamens 10 



Leaves opposite, strongly ascending 

 or nearly erect, narrow, grasslike, rigid, 

 about % to 3 in. long, tipped with a hard, 

 prickly point, with fine-toothed margins 



Stems tufted, erect, 4 to 14 in. high, 

 slender, somewhat woody at base, hair- 



Taproot perennial, with many- 

 branched root crown 



