London Rocket
Sisymbrium irio, Mustard family (Cruciferae)
Flowers: Very small yellow flowers, to 1/8", clustered at top of stem. Thin spikes with yellow tips may surround the cluster, like a spray of fireworks.
Leaves: Long, dark green leaves, wavy and pointed.
Height: Grows to 3' high.
Photographed March 23, near Superstition Mountain..
Typically found near roadsides.