Burroweed. Ambrosia dumosa, Aster Family ( Asteraceae ) Formerly called the Compositae or composite family, Burroweed. Also Called: White Bursage, Burro Weed, Burro Bush, Desert Bur Sage, Desert Ragweed, Burro - Weed, White Bursage, Franseria dumosa. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. While this plant is recommended by the Arizona Municipal Water Users Association, WE STRONGLY RECOMMEND THAT YOU DO NOT USE IT!! Ambrosia are considered by many to be noxious weeds and are listed among some of the leading plants that cause allergies. Their burs have a habit of getting caught into clothing. With that being said, ranchers do like the plants since the flowers are edible by cattle and sheep. Ambrosia dumosa is a highly branched, drought-deciduous, perennial shrub 8 inches to 40 inches in height and width. Its younger stems are covered with soft gray - white hairs. It has tiny, slightly obvate leaves with soft gray-white hairs, that are 1 to 3 times pinnately compound, or deeply lobed, and clustered on short branches. Its inflorescence is yellow with tiny staminate and pistallate flower heads on a single plant (monoecious). Ambrosia dumosa has hairy, spiney, spherical bur-like fruits ranging in color from golden to purple to brown. Ambrosia dumosa, the burro-weed or white bursage, is a common constituent of the creosote-bush scrub community throughout the Mojave desert of California, Nevada, and Utah and the Sonoran Desert of Arizona and northwestern Mexico. Wind blown pollen from Ambrosia dumosa is said to be highly allergenic. Quick Notes: Height: Up To about 40 inches tall and about 40 inches wide. Flowers: On an inflorescence, of male and female heads (plant monoecious). Yellow, the staminate heads have many flowers and are 3 to 5 mm in diameter with a 5 to 8 lobed involucre. The pistillate heads are 2 flowered and lack a corolla. Flowering Time: Mid March to June and September to November. Fruit: Spherical bur-like fruits, colored from gold, to purple, to brown. Covered with microscopic hairs, the fruit has 12 to 35 flat and straight spines which are 1/4 to 1/3 inches in length and scattered over the surface. Leaves: Dull green 1 - 3 times pinnate leaves mostly clustered, 1/8 to 3/8 inch long, with 1-3 short obtuse lobes, generally clustered on short branches. Found: The USDA claims it is native to the USA (AZ, CA, NV, UT). It is also native to regions of northwestern Mexico; Baja Norte, Baja California, & Sonora. Hardiness: USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) 8.6 to 9.0 (strongly alkaline) Sun Exposure: Full Sun Sun to Partial Shade Elevation: 0 to 5,842 feet. Habitat: Creosote Bush Scrub, Joshua Tree Woodlands. Miscellaneous: Photos Courtesy: Wikipedia, the free encyclopedia. WE STRONGLY RECOMMEND THAT YOU DO NOT USE THIS PLANT!!.

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