- Anagallis arvensis – Scarlet Pimpernel
- Anagallis arvensis ssp. foemina – Poorman's Weatherglass
- Baileya multiradiata – Desert Marigold
- Centaurea melitensis – Maltese Star-thistle
- Centaurium arizonicum – Arizona Centaury
- Cirsium arizonicum – Arizona Thistle
- Cirsium neomexicanum – New Mexico Thistle
- Cirsium ochrocentrum – Yellowspine Thistle
- Conyza canadensis – Canadian Horseweed
- Corydalis aurea – Scrambled Eggs
- Dieteria canescens – Hoary Tansyaster
- Dryopetalon runcinatum – Rockmustard
- Erigeron divergens – Spreading Fleabane
- Erodium cicutarium – Redstem Stork's Bill
- Erodium texanum – Texas Stork's Bill
- Erysimum capitatum – Sanddune Wallflower
- Gaillardia pulchella – Firewheel
- Hymenothrix wislizeni – Trans-Pecos Thimblehead
- Hymenothrix wrightii – Wright's Thimblehead
- Ipomopsis longiflora – Flaxflowered Ipomopsis
- Lactuca serriola – Prickly Lettuce
- Lamium amplexicaule – Henbit Deadnettle
- Lappula occidentalis – Flatspine Stickseed
- Lesquerella gordonii – Gordon's Bladderpod
- Machaeranthera tanacetifolia – Tanseyleaf Tansyaster
- Malva parviflora – Cheeseweed Mallow
- Matthiola longipetala – Night Scented Stock
- Melilotus officinalis – Yellow Sweetclover
- Mentzelia multiflora – Adonis Blazingstar
- Modiola caroliniana – Carolina Bristlemallow
- Nicotiana obtusifolia – Desert Tobacco
- Nuttallanthus texanus – Texas Toadflax
- Oenothera elata – Hooker's Evening Primrose
- Streptanthus carinatus – Lyreleaf Jewelflower
- Verbascum thapsus – Common Mullein
- Veronica anagallis-aquatica – Water Speedwell
Biennials
Biennials are plants with a two-year life cycle, and they will generally bloom during their second year.
Listed below are some of the biennial plants found in southeastern Arizona.