Verbenaceae (Vervain family)

Broadleaf plant family

Of about 90 known genera, only three occur in the state. Most prevalent are the vervains, with seven species, most commonly encountered throughout Missouri.

Vervain, blue
Verbena hastata
 

Vervain, hoary
Verbena stricta
 

For an idea of relative seed size, each photo contains a millimeter ruler. The distance between increments is 1 mm.