Ambrosia

acanthicarpa

Annual Bursage

efloras

Acanthicarpa is derived from the Greek akanthi (thorn) and carpa (fruit). This specimen was growing on sandy soil on the road to Christ in the Desert near Ghost Ranch, New Mexico. Nearby species include Grindelia nuda (Curlytop Gumweed), Psilostrophe tagetina Yellow Paper Daisy), and Dimorphocarpa wislizeni (Spectacle Pod).

Ambrosia

ambrosioides

Canyon Ragweed

efloras

 
Growing in the Gardens of the Sonoran Desert Museum at 3,000 Foot elevation on April 20, 2003.
Ambrosia

deltoides

Triangle Leaf Bursage

eflora

Triangle Leaf Bursage, along with Larrea tridentata (Creosote Bush) is one of the most drought tolerant shrubs in the Southwest. This specimen was growing in a desert park near Tucson, Arizona at an elevation of 2,400 Feet on March 14, 2007. Nearby flora include Paloverde and Saguaro.
Ambrosia

dumosa

Burro Weed

efloras

Dumosa means shrubby. Its a sunny, cool day at Mesquite Flats Campground in Death Valley, California. Three or four gray shrub species growing on the gravel fands and adjacent alkali flats near Mesquite Spring. Elevation here is 1,750 feet, nearly 2,000 feet above the visitor center. Apparently the weather has been recently cool (its March 15) leaves are just coming out. Plant height is 36 inches, leaves alternate, length 11 mm., width 10 mm. Flowers are typical ambrosia, tiny and greenish.
Ambrosia

psilostachya

Western Ragweed

efloras

This specimen was growing on disturbed ground in a field in Los Alamos, New Mexico, in August. Elevation is 7,200 feet. Nearby species include Lacuta serrulata.
Ambrosia

salsola

Gray Cheesebush

efloras

Specimen growing on gravel roadside in Death Valley California, 1,800 Feet, March 17, 2007. Threadlike leaves are about 35 mm long and 1mm or less wide . Plant height is 24 in., leaves alternate, flowers greenish white, flowe width 11mm, 2 style branches, note male flowers in backgound of several photos.
Ambrosia

trifida

Giant Ragweed

elforas

Giant Ragweed, Ambrosia trifida, growing in low area near roadside,Arkansas River Valley just upstream of Lake Pueblo. 5,000 feet, September 13, 2007. Huge herbaceous plant is 2.3 meters tall, disk flowers only, leaves unlobed. Leaves on this species vary from three lobed to unlobed.