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
Blood ragweed
Asteraceae
Location: 15 m N of the new Iron Bridge, on E side of creek--Oakwell Farms.Latitude: 0.000000
Habitat: Half shade; moist, alkaline, alluvial soil.
Description: Erect, taprooted annual, 4 m tall. Stem angled and striate. Leaves variable (3-5 palmate lobes usual), to 15 cm long, almost that broad, on petioles to 7 cm, opposite, dark green. Infloresence of staminate racimiform heads to 10 cm long; pistillate heads much smaller, congested in axial bracts below the racemes.
County: Bexar
Collector: Harry Cliffe
Collection Date: Jul 29, 1987
Specimen number: 288
Herbarium Owner: NPSOT
Herbarium ID: 0536
Accession Date: Aug 24, 1993
Accession Number: 40
Annotations: MCXXB