- Ambrosia acanthicarpa, Hookers Bur-ragweed;Flatspine bur ragweed
- Ambrosia ambrosioides, Ambrosia leaf bur ragweed;Canyon Ragweed
- Ambrosia artemisiifolia, Ragweed;Ambrosia elatior L;Annual ragweed;Rgweed
- Ambrosia bidentata, Lanceleaf ragweed
- Ambrosia chamissonis, Silver bur ragweed
- Ambrosia cheiranthifolia, Rio Grande ragweed
- Ambrosia chenopodiifolia, San Diego bur ragweed;San Diego Bursage
- Ambrosia confertiflora, Burr Ragweed;Franseria confertiflora Dc Rydb;Franseria tenuifolia Harv & Gray;Weakleaf bur ragweed
- Ambrosia cordifolia, Tucson bur ragweed
- Ambrosia deltoidea, Triangle bur ragweed;Triangleleaf Bursage
- Ambrosia eriocentra, Woolly fruit bur ragweed
| - Ambrosia grayi, Woollyleaf bur ragweed
- Ambrosia hispida, Coastal ragweed
- Ambrosia ilicifolia, Hollyleaf bur ragweed
- Ambrosia linearis, Streaked bur ragweed
- Ambrosia peruviana, Peruvian Ragweed;Peruvian ragweed;Ambrosia cumanensis
- Ambrosia psilostachya, Perennial Ragweed;Ambrosia coronopifolia Torr & A Gray;Cuman ragweed
- Ambrosia pumila, Dwarf bur ragweed
- Ambrosia tenuifolia, Lacy Ambrosia;Slimleaf Bur Ragweed
- Ambrosia tomentosa, Skeletonleaf bur ragweed
- Ambrosia trifida, Giant Ragweed;Great ragweed
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