Ambrosia bidentata Michx. - Ragweed

Ambrosia bidentata plant

Family - Asteraceae

Stems - No info. yet.

Ambrosia bidentata stem

Leaves - No info. yet.

Inflorescence - No info. yet.

Ambrosia bidentata inflorescence

Involucre -No info. yet.

Ray flowers - Absent.

Disk flowers - No info. yet.

Ambrosia bidentata flowers

Flowering - July - October.

Habitat - Prairies, fields, waste ground, pond margins, pastures, roadsides, railroads.

Origin - Native to U.S.

Other info. - This weedy species is common throughout much of Missouri but is absent in the northwest corner of the state. The plant is easy to identify in the field because of its 1-3 shallowly lobed leaves and its single terminal spike of staminate flowers. Like the other species in this genus this plant is a cause of hay fever in the fall.

Photographs taken off Hwy 60, Carter County, MO., 8-31-03, and at Big Spring, MO., 8-3-04.


Back