Swainsonpea (Fremont County Declared Noxious Weed)
Swainsonpea (Fremont County declared weed)
- Sphaerophysa salsula
- Fabaceae (Pea family)
Swainsonpea was introduced from Asia and is commonly found in some western states including Wyoming, infesting roadsides, along fences and other areas. A Declared Noxious Weed in Fremont County, it is a potential threat to alfalfa and grain producing areas.
Growth Habit: Creeping, upright perennial, many branched.
Leaves: Compound, composed of numerous opposite leaflets which are oval and covered with hair.
Flowers: Orange-red about 1/4 to 1 inch in length. Flowers from May to July. Numerous seeds are formed in bladder-like translucent pods.
Roots: Creeping, lateral roots. Reproduces by root and seed.
Status: County Declared Noxious Weed, Category 4. Widespread infestation. Control and maintenance of current weed infestations.
Control: Herbicides can be effective. FCWP offers a 40 percent Cost Share on chemicals for controlling this species. Contact your local weed and pest office for further treatment recommendations.
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Lander
332-1052
56 Tweed Ln
Lander, WY 82520
Riverton
856-2192
1446 Cowboy Ln
Riverton, WY 82501