Plant species of Tumamoc Hill

Tumamoc has more than 300 species of plants. Thanks to the artistry, hard work and generosity of T. Beth Kinsey, you can already see a few of them in this part of the website.

The species list has all our species but many do not yet have their own webpage. We are working to include them, too. (Check the What's new? page for notice of additions.)

Meanwhile, visit Beth's own site Fireflyforest where you will find other plants of southern Arizona, as well as many from Hawaii. And please do let Beth know how much you appreciate her work!

Ambrosia deltoidea – Triangle Bur Ragweed

Ambrosia deltoidea - Triangle Bur Ragweed, Triangle Burr-Ragweed, Triangleleaf Bursage, Triangle-leaf Bursage

Ambrosia deltoidea - Triangle Bur Ragweed, Triangle Burr-Ragweed, Triangleleaf Bursage, Triangle-leaf Bursage

Plant Name

Scientific Name: Ambrosia deltoidea

Synonym: Franseria deltoidea

Common Names: Triangle Bur Ragweed, Triangle Burr-Ragweed, Triangleleaf Bursage, Triangle-leaf Bursage

Plant Characteristics

Duration: Perennial

Growth Habit: Shrub, Subshrub

Arizona Native Status: Native

Habitat: Desert

Flower Color: Yellowish, Greenish

Flowering Season: Spring

Height: To 2 1/2 feet (76 cm) tall or more

Description: The staminate (male) flower heads are clustered at the tips of short flower spikes, and the pistillate (female) flower heads are clustered below them. The flowers are wind-pollinated and are followed by spiny burs. The leaves have toothed margins and are hairy, petiolate, mostly alternate, gray-green in color, triangular in shape, and up to 1 3/4 inches (4.4 cm) long. The stems are upright, hairy, and brownish to green in color.

Special Characteristics

Allergenic – The male flowers have highly allergenic pollen.

Classification

Kingdom: Plantae Plants
Subkingdom: Tracheobionta Vascular plants
Superdivision: Spermatophyta Seed plants
Division: Magnoliophyta Plants
Class: Magnoliopsida Dicotyledons
Subclass: Asteridae
Order: Asterales
Family: Asteraceae Aster family
Genus: Ambrosia L. – ragweed
Species: Ambrosia deltoidea (Torr.) Payne – triangle bur ragweed

RETURN TO SPECIES LIST

Tumamoc is retooling to meet the challenges and opportunities of its second century.
Your support can make these plans a reality.

Help Tumamoc extend its timeline throughout the 21st century
and beyond.
 Tumamoc is managed by the University of Arizona College of Science and Pima County, Arizona.