Sisymbrium irio
Possibly the most abundant weed in Las Cruces. Also reasonably common in ravines outside of cities.
Plant habit, behind my apartment in Las Cruces, 1/28/05.
An inflorescence in Las Cruces, 1/28/05.
A closer view of flowers in Las Cruces, 1/28/05.
Cauline leaf and developing lateral inflorescence in Las Cruces, 1/28/05.