A walk in the backyard:

Mystery plant. Not sure if these are flowers or fruit. I’ve been watching it over 2 years and still can’t identify it.
Scientific names and families:
White wood aster/Eurybia divaricata – Aster Family: Asteraceae
Climbing nightshade/Solanum ducamara – Nightshade Family: Solanaceae
Parsley/Petroselinum crispum – Parsley family: Apiaceae
Jewelweed/Impatiens capensis – Touch-me-not Family: Balsaminaceae
Ragweed/Ambrosia artemisiifolia – Aster Family: Asteraceae
Mystery plant???