Poaceae), prickly Russian thistle
, pitseed goosefoot, Chenopodium berlandieri (Chenopodiaceae), buffalo gourd, Cucurbita foetidissima (Cucurbitaceae), Drummond's clematis, Clematis drummondii (Ranunculaceae), peppergrass, Lepidium sp.
is particularly troublesome in arid and semi-arid regions of the western United States.
Monitoring Russian Thistle
(Salsola iberica) Root Growth Using a Scanner-Based, Portable Mesorhizotron.
is a summer annual weed, first reported in the United States in South Dakota in 1877 (Dewey 1893).
They are quackgrass, Canada thistle, burdock, white or oxeye daisy, snapdragon or butter and eggs, cocklebur, perennial sow thistle, sour dock, yellow dock, wild mustard, wild parsnip, and Russian thistle
As Pyne explained in Fire in America, the cattle industry introduced new sources of fuel like the exotic Russian thistle
as well as the ubiquitous cow chips, which, "sailing like flaming frisbees before high winds," became "a major threat to isolated farms and towns.
Besides ragweed, which is considered to be the pollen most responsible for late summer and fall hayfever in North America, there are other weeds that can cause pollen allergy, including sagebrush, pigweed, tumbleweed, Russian thistle
, and cockleweed.
Ragweed is the major culprit, but others of importance are sagebrush, redroot pigweed, lamb's quarters, Russian thistle
(tumbleweed), and English plantain.
Other weeds that cause allergic reactions are pigweed and sagebrush (tumbleweed), Russian thistle
, plantain, mugwort, dock sorrel, cocklebur and lamb's quarters.
The most common seasonal antigen was Russian thistle
Currently, EBCL's top weed priorities include yellow starthistle, Russian knapweed, saltcedar, Russian thistle
, leafy spurge, hoary cress, perennial pepper-weed, spotted knapweed, medusahead ryegrass, and rush skeleton weed.
In California, residents only have to look to the hills and vacant city lots for a list of culprits: Russian thistle
, or tumbleweed; coastal sage; mug woort; lamb's quarters; lenscale; pig weed; western and false ragweed; English plantain and redroot.