Locoweed

plant

Oct 9, 2023 - 07:34
 0  19

locoweed, any of several species of poisonous plants of the genera Astragalus and Oxytropis, in the pea family (Fabaceae). Locoweeds are native to the prairies of north central and western North America and can pose a danger to livestock, horses, and other grazing animals. If ingested, the plants’ toxins produce frenzied behaviour, impaired vision, and sometimes death, though most locoweeds are unpalatable to livestock and are eaten only when other forage is unavailable. The level of toxicity appears to depend on soil conditions; decaying locoweeds release toxins sometimes taken up by otherwise harmless forage crops.

Many locoweed species are low-growing plants, up to 45 cm (1.5 feet) high. They are of variable hairiness and generally feature compound leaves and spikes of pealike flowers. A few are especially dangerous: woolly locoweed (Astragalus mollissimus), with woolly leaves and violet flowers; halfmoon milkvetch (A. wootonii), with whitish flowers; crazyweed, or purple loco (Oxytropis lambertii), with pink to purplish flowers; and the showy oxytropis (O. splendens), bearing silvery hairs and rich lavender-pink flowers.

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