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Digital Herbaria

Ambrosia trifida var. texana

Ambrosia trifida L. var. texana Scheele

Texan Great Ragweed, Giant Ragweed

Asteraceae (Aster Family)

USDA Native Status: L48 (N)

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Specimen & Label Data

Ambrosia trifida var. texana

Giant Ragweed


Location: NE corner of Salado Creek & low-water crossing on road from main base of Ft Sam Houston to Pershing Firing Range, San Antonio.
Latitude: 0.000000

Habitat: Full sun. Damp, alluvial soil. Manay, among mixed herbaceous species.

Description: Tap-rooted annual, to 2.5 m tall. leaves opposite, scabrous, long petioled. Lower leaf blades orbicular, 3-5 cleft, becoming simple above. Margins serrage. Staminate heads racemose; pistillate heads clustered in axils below racemes.

County: Bexar
Collector: Harry Cliffe
Collection Date: Oct 12, 1994
Specimen number: 706

Herbarium Owner: NPSOT
Herbarium ID: 0995
Accession Date: Jan 24, 1995
Accession Number: 78

Annotations: MCFXB (In flower & fruit)

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