Coronopus didymus
The name of this weed is particularly sad. Its common English name is apparently "lesser swinecress." With a name like that, I had to pay it tribute.
Watch this weed grow as a stop-motion animation.
With thanks to The Luggage Store Gallery for their roof access & all around awesomeness.
Location
San Francisco
, CA
United States
See map: Google Maps
California US
Not accessible to the public.