Veronica filiformis
Creeping Veronica
Southern Europe and Northern Europe and Asia

 
2 inches tall
Pale blue, with 4 petals flowers borne singly in the leaf axils
Early summer
Opposite, rounded leaves are crenate on the margin and the stems root all along their length, thus forming dense mats of growth.
 
 
 
 
Pest in lawns

 

 
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