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	Larkspur: Managing grazing to avoid poisoning cattle
	Publication #: MP-111.13 Date Published: 07/01/2010 Publication Author(s): Michael A. Smith James W. Waggoner Shannon sims

Description:
Poisoning of cattle by larkspur (Delphinium spp.) is common perhaps the most common deadly poisonous plant problem on Western U.S. rangelands. Poisoning usually occurs in spring on plains and foothill ranges in Wyoming and during summer on montane ranges. The small stature larkspur species typical of plains and foothill rangelands are D. geyeri, nuttallianum, and bicolor. These species vary regionally around Wyoming in abundance and incidences of poisoning. Plains larkspur (D. geyeri) in Albany and Carbon counties of southeast Wyoming appears to be the most frequent problem. Tall larkspurs, D. barbeyi in southern Wyoming and D. occidentale in most of Wyoming, but less poisonous in southern Wyoming, occur in mountain regions generally receiving more than 20 inches annual precipitation.

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