Native Plants
Digital Herbaria
Ambrosia trifida var. texana
Ambrosia trifida L. var. texana Scheele
Texan Great Ragweed, Giant Ragweed
Asteraceae (Aster Family)
USDA Symbol: AMTRTUSDA Native Status: L48 (N)
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Specimen & Label Data
Ambrosia trifida var. texana
Giant Ragweed
Asteraceae
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)