Snakeweed


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Snakeweed

 

several species of plants of various families.

The name most often refers to Polygonum bistorta, a herbaceous plant of the family Polygonaceae. The thick, twisted, snakelike rhizome contains tannins, gallic and ellagic acid, catechin, oxymethylanthraquinone, starch, glucose, vitamin C, provitamin A, dyes, and other substances. The liquid extract and the decoction of the rhizome are used as astringents and antiphlogistics internally for intestinal disorders and uterine and gastrointestinal hemorrhages and externally for inflammatory diseases of the mucous membranes.

The name “snake weed” is also given to Virginia snake root (Aristolochia serpentaria), a North American plant of the family Aristolochiaceae. In various localities of the USSR “snakeweed” is used for about ten other species of plants, including ladies’-tobacco (Antennaria dioica)’, species of the genus Gnaphalium, family Compositae; and the lily of the valley (Maianthemum bifolium), family Liliaceae.

References in periodicals archive ?
On 11 July, three nymphs (one 4th instar and two 5th instars) of the snakeweed grasshopper, Hesperotettix viridis viridis, were collected for comparison with A.
Shallow rills through the Laate Orchard and the Lalio cornfield were filled with fine woody material from rubber rabbitbrush (Chyrsothamnus nauseosus) and broom snakeweed (Gutierrezia sarothrae).
Two women, Anna Pierce, a midwife and her assistant, Aunt Shawnee,demonstrated that milk from a cow fed Snakeweed killed a calf which consumed the milk.
The rancher (with a few honorable exceptions) is a man who strings barbed wire all over the range; drills wells and bulldozes stock ponds; drives off elk and antelope and bighorn sheep; poisons coyotes and prairie dogs; shoots eagles, bears, and cougars on sight; supplants the native grasses with tumbleweed, snakeweed, povertyweed, cowshit, anthills, mud, dust, and flies.
Snakeweed (Gutierriza sarothrae) was negatively affected by increased frequency of clipping, steadily decreasing between years by -0.
If we can determine how to safely increase the use of previously unused woody species, including honey mesquite, creosotebush, and broom snakeweed, we could tap an unused range resource," says Havstad.
Under turquoise skies, the dark junipers, spiky gray-green yucca and lime stalks of snakeweed contrasted sharply with the waters of the Rio Puerco, a shallow red river curling through high red banks.
Since the end of the nineteenth century, desert grasslands in southern Arizona have experienced notable increases in the distribution and density of scrubby trees and shrubs, including mesquite (Prosopis), juniper (Juniperus), burroweed (Isocoma tenuisecta), and snakeweed (Gutierrezia; Bahre, 1995).
So also is the case of the snakeweed grasshopper, Hesperotettix viridis (Scudder), which can reach densities of 30 m-2, but feeds exclusively on poisonous plants (Pfadt 1994).
Remote sensing of broom snakeweed (Gutierrezia sarothrae) and spiny aster (Aster spinosus).