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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 Symbol: AMTRT
USDA 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

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