African or Sahara Mustard
Photographed at Hedgepeth Hills, Maricopa Co., Arizona. Feb 2, 2008. This image is available at full resolution at the Wikimedia Project.
The flowers of Sahara Mustard are disposed on tall spikes and are very pale yellow. Long, coarse siliques (pods) contain many seeds.
ANNUAL: Robust weed of mostly disturbed ground but increasingly
invading pristine Sonoran Desert habitat. Begins vegetative growth early spring
or late winter.
In February 2020 I found a colony of Mustard Aphid, Lipaphis, on new growth of Sahara Mustard.
Should this aphid become widespread on this invasive it could help integrate it to the Sonoran Desert ecosystem
and lessen its adverse effects.
Usual-looking sac of a bug, greenish-gray, distinguished usually by the host plant. More info
The flowers of Sahara Mustard open early in spring and are visited by Honey Bees. This bee's pollen baskets are loaded with the yellowish pollen of this mustard. And, like this mustard, honey bees are not native to the Sonoran Desert.
Brassicaceae -- Mustard Family
Desert Field Guide
Sonoran Desert Places
Sonoran Desert Naturalist Home Page