Iceland poppies, Papaver nudicaule. These are actually golden yellow with orange streaks ... the camera hasn't managed to capture the colour very accurately. Despite its name this species of poppy originates in Asia.
The camera also freaked a little in trying to capture the intense red of this newly opened California poppy (Eschscholtzia californica) with fluted petals and orange streaks ... but you get the idea.
Another view of the Patty's Plum oriental poppy (Papaver orientale).
A common wild field poppy, Papaver rhoeas, self-seeded in a pot on the patio. Poppies have a curious ability to express their flower size according to the available conditions, and this rather small bloom is typical of what happens when they grow in pots.