houseweeds

Galinsoga parviflora, also known as galinsoga, guasca, quickweed, and gallant soldier, annoyingly pops up everywhere in the garden. But apparently it's edible and is used as a herb or in salads. Wikipedia says,

In Colombia it is used as a spice herb in the soup Ajiaco. It can also be used as an ingredient in leaf salads, although its subtle flavour, reminiscent of artichoke, mostly develops after being cooked. In eastern Africa, the plant is collected from the wild, and its leaves, stem and flowers eaten. It is also dried and ground into powder for use in soups.