MUSTARD FAMILY 



VERNAL WHITLOW-GRASS 



Drdba verna 



Whitlow-Grass. Drdba verna 



Annual or biennial. Natu- 

 ralized from Europe. Waste- 

 lands, sandy fields, and road- 

 sides, from Atlantic coast to 

 the Mississippi. February- 

 May. 



Stem. — One to five inches 

 high. 



Leaves. — About an inch long, 

 in a tuft or rosette on the 

 ground, oblong or spatulate, 

 covered with stiff hairs. 



Flowers. — Small white cruci- 

 fers at the summit of the 

 flowering stem; petals are two- 

 cleft and so destroy the cross- 

 like effect; pods vary from 

 round-oval to oblong-lance- 

 olate. 



Pollinated by bees; also practises self-pollination. 

 Nectar-bearing. 



A small, insignificant plant, its rosettes of small 

 leaves trodden upon and unnoticed. 



LYRE-LEAVED ROCK-CRESS 



Arabis lyrdta 



Perennial or biennial. Sandy or rocky places. Ontario 

 to Manitoba, south to Virginia, Tennessee, and Mis- 

 souri. Found in northern Ohio. April, May. 



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