Purslane

Purslane is a succulent, edible weed that thrives in hot, dry conditions and spreads rapidly by seed.
Portulaca Olderacea
Origin: Global
USDA Hardiness Zones: 2-11
Pros:
Edible – leaves are rich in omega-3 fatty acids
Heat tolerant – survives drought and poor soil
Cons:
Rapid spreader – reseeds and regenerates easily
Unwanted in beds – competes with desirable plants
David Kim