Native Plants

Plant Database

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Lynn, Janice

Ambrosia trifida var. texana

Ambrosia trifida L. var. texana Scheele

Texan Great Ragweed, Giant Ragweed

Asteraceae (Aster Family)

Synonym(s): Ambrosia aptera, Ambrosia trifida var. aptera

USDA Symbol: AMTRT

USDA Native Status: L48 (N)

From the Image Gallery

15 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Annual
Habit: Subshrub
Leaf Arrangement: Opposite
Leaf Complexity: Simple
Leaf Shape: Elliptic , Lanceolate , Ovate
Leaf Base: Cuneate , Truncate
Size Notes: Up to about 12 feet tall, often shorter.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: Yellow
Bloom Time: Jul , Aug , Sep , Oct , Nov

Distribution

USA: AZ , IL , KS , LA , MO , MS , NM , OK , TX

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Lady Bird Johnson Wildflower Center - Austin, TX
Nueces River Authority - Uvalde, TX

Herbarium Specimen(s)

NPSOT 0536 Collected Jul 29, 1987 in Bexar County by Harry Cliffe
NPSOT 0995 Collected Oct 12, 1994 in Bexar County by Harry Cliffe

2 specimen(s) available in the Digital Herbarium

Wildflower Center Seed Bank

LBJWC-MM-707 Collected 2009-11-16 in Hays County by Lady Bird Johnson Wildflower Center

1 collection(s) available in the Wildflower Center Seed Bank

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Ambrosia trifida var. texana in USDA Plants
FNA: Find Ambrosia trifida var. texana in the Flora of North America (if available)
Google: Search Google for Ambrosia trifida var. texana

Metadata

Record Modified: 2022-10-12
Research By: TWC Staff

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