A distinguishing characteristic of long-stalked phyllanthus is the round seed capsule. (Photo by Mark Claesgens)

Long-stalked phyllanthus are extremely invasive summer annuals. (Photo by Mark Claesgens)

Mulberry weed has an upright growth habit. (Photo by Ron Strahan)

Mulberry weed has unique feathery flowers that first appear purplish and then brown. (Photo by Mark Claesgens)