Medford Leas Residents Assn.
Wildflowers Home Page

Solanum nigrum
Common Nightshade
Solanaceae

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Interesting info:

wikipedia has info, photos and also culinary and medical uses & photos

wikipedia

This is not "deadly nightshade" which is Atropa belladonna

 

Brassica rapa - Rape
Mother Herbs

You ought to know:

Area: Dry waste places

Height: 1 - 3 feet

Frequency: Low

Blooms: Summer

Color: Violet