London Rocket
Sisymbrium irio
This specimen found in Phoenix, Arizona on 20 March 2008 was imaged using a flat-bed scanner.
SPRING ANNUAL: Tall, weedy annual growing quickly after favorable
winter/spring rains blooming from January to April.
LEAVES Smooth, dark green, glabrous leaves are pinnately divided.
RANGE: Abundant everywhere in the Sonoran Desert of Arizona and
Sonora region especially in vacant city lots and in agricultural areas. Also in disturbed soils near roadsides and in washes.
FLOWERS: Small yellow flowers are arranged in elongated spikes.
FRUIT: thin, elongate pods with numerous seeds.