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Delphinium geyeri is a species of plant in the Ranunculaceae family that is often called by the common names plains larkspur and foothills larkspur. It is infamous for causing the deaths of cattle grazing in the spring because it is especially poisonous before it flowers and so it is also called poisonweed by ranchers.
All parts of these plants are considered toxic to humans, especially the younger parts, [2] causing severe digestive discomfort if ingested, and skin irritation. [ 2 ] [ 3 ] [ 10 ] [ 64 ] Larkspur, especially tall larkspur, is a significant cause of cattle poisoning on rangelands in the western United States. [ 65 ]
Delphinium trolliifolium is a species of larkspur known by the common names poison delphinium, cow poison, and Columbian larkspur. It is native to Washington, Oregon, and northern California. [1] This wildflower reaches one half to just over one meter in height. It has large, shiny, deeply lobed leaves.
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Delphinium caseyi, also known as Casey's larkspur, is a flowering plant within the family Ranunculaceae. [ 1 ] Their population is estimated to be at around 100 individuals, which lead to this species receiving a critically endangered status.
Delphinium nudicaule, known by the common names canyon larkspur, red larkspur, orange larkspur, and canyon delphinium, is a flowering herbaceous perennial plant in the buttercup family Ranunculaceae. It is native to low-elevation canyons and slopes, foothills, and mountain ranges of California, US, from the Sierra Nevada to the California Coast ...
Delphinium cardinale is a species of larkspur known by the common names scarlet larkspur and cardinal larkspur. This wildflower is native to California and Baja California , where it grows on coastal, inland, and desert chaparral slopes, such as the Colorado Desert , and the Peninsular and Transverse Ranges . [ 2 ]
Since larkspur is common in high-elevation locations, many ranchers wait to move their cattle until the end of summer owing to a decrease in toxicity. Delphinium scopulorum is so toxic that death can occur within a few hours of ingestion. Death is due to neuromuscular blocking as well as cardiotoxic effects.