Physical Setting
Climate
Adaptations
Tucson Plants
Tucson Animals
External Resources
Physical Setting
Climate
Adaptations
Tucson Plants
Tucson Animals
External Resources
PlantsNative TreesNative ShrubsNative CactusesWildflowersOther Plants
Previous SpeciesNext Species
Canyon Ragweed (Ambrosia ambrosioides)
canyon ragweedDESCRIPTION: Shrub to 6' or more. Branches are reddish-brown with long, white hairs. Leaves are simple, toothed, elongated triangle or lance-shaped, hairy, green, and up to 5" long. Flowers bloom Feb. - May and are yellowish-green, small (less than 0.5" wide), in spikes. Fruit is a bur with spines to 1" long. Compositae (Sunflower) Family.
NATURAL HISTORY: Flower is wind-pollinated and plagues allergy-sufferers. Most commonly seen in washes and along roadsides where soil moisture is higher here in Tucson area.

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