Robert W. Freckmann Herbarium


  Ambrosia psilostachya DC. image
Photographer: Kenneth J. Sytsma           

Botancial Illustration

Emmet J. Judziewicz

Emmet J. Judziewicz

Emmet J. Judziewicz
Family Asteraceae
Ambrosia psilostachya DC.
perennial ragweed, western ragweed
Ambrosia: Greek for "food of the gods"
psilostachya: derived from the Greek psilos, "bare," and stachys, "a spike," hence a "bare spike"
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect, perennial, 12"-40" tall forb with upper branches; creeping, fibrous roots
Flower: inflorescence of many, small, green, bead-like heads on 6" spikes; blooms Aug.-Sept.
Fruit:seeds not on fluffy pappus
Leaf:usually once pinnately-divided, lower leaves opposite, upper leaves alternate
Habitat: dry; prairies, disturbed sites; in sandy soil
(Glossary)

More Information Natural Communities Herbarium Specimens
All Ambrosia list Google- Images or Text

Flora of North America (off site)
Synonyms 
Ambrosia californica Rydb.
Ambrosia coronopifolia Torr. & A.Gray
Ambrosia coronopifolia Torr. & A.Gray var. asperula A.Gray
Ambrosia coronopifolia Torr. & A.Gray var. gracilis A.Gray
Ambrosia cumanensis Kunth
Ambrosia lindheimeriana Scheele
Ambrosia psilostachya DC. var. californica (Rydb.) S.F.Blake
Ambrosia psilostachya DC. var. coronopifolia (Torr. & A.Gray) Farw. ex Fernald
Ambrosia psilostachya DC. var. lindheimeriana (Scheele) Blank.
Ambrosia rugelii Rydb.

         
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