Senna armata

It is native to the desert regions around the intersection of Nevada, Arizona, eastern California and northern Baja California, where it grows in sandy and rocky habitat, such as arroyos.

It is a shrub growing up to a meter tall, its grooved, branching stems often narrowing to thorns at their tips.

The spiny branches are coated in tubular hairs which help protect it from hot desert air.

Flowers occur singly or in small clusters in leaf axils.

They are fragrant and showy, with five petals in shades of yellow to salmon pink, each measuring roughly a centimeter long.