Stem

Up to 5 ft. tall and covered with short hairs

Leaves

Pinnate-compound; leaflets are oval, opposite, 0.2-0.8 in. long, lack leaf stems (petioles) and covered with short hairs on lower surface

Flower

Pea-like, reddish-orange and 0.5 in. long
Pods are oval, bladder-like, translucent and contain many seeds; seeds remain in pods during dispersal

Root

Woody, creeping root system; roots associate with nitrogen-fixing bacteria

Photo of Swainsonpea plant with small pink flowers

Other

Often infests roadsides, fencerows and irrigation ditches; not known to occur in Nevada
Perennial; reproduces by seed and creeping roots
Potential contaminant of alfalfa seed due to similar size, shape and weight
Also known as Austrian peaweed

Control

Hand removal of individual plants, including roots, can limit spread of small infestations
Apply 2,4-D, aminopyralid, clopyralid, dicamba, glyphosate, picloram, or triclopyr at bloom stage

Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Nevada Noxious Weed Field Guide – Swainsonpea, Extension, University of Nevada, Reno, Field Guide

Learn more about the author(s)

Heidi Kratsch

Also of Interest:


Needs Assessment for Noxious Weeds in Churchill County: Part 4 of 5 - Criteria for Herbicide Use and Selection This fact sheet is the fourth in a series of five that reports the results of a needs assessment survey completed by faculty in University of Nevada Cooperative Extension (UNCE). The survey attempted to identify the major issues related to the management and control of weeds in N... Davison, J., Powell, P., Schultz, B., and Singletary, L. 2012, University of Nevada Cooperative Extension
Nevada’s Priority Agricultural Weeds: Hoary Cress Plants commonly referred to as hoary cress (Cardaria sp.), or short whitetop, are one of three different but closely related perennial forbs. The Cardaria species are widespread across all eleven Western states, including every county in Nevada. B. Schultz, S. Foster 2021, Extension, University of Nevada, Reno, SP-21-03
Nevada Noxious Weed Field Guide – African mustard African mustard is a noxious weed that has been identified by the state of Nevada to be harmful to agriculture, the general public, or the environment. Learn more about this weed. Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., H. Kratsch, Moe, A., Schultz, B. 2020, Extension, University of Nevada, Reno, Field Guide
Nevada Noxious Weed Field Guide – Common crupina Common crupina is a noxious weed that has been identified by the state of Nevada to be harmful to agriculture, the general public, or the environment. Learn more about this weed. Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Extension, University of Nevada, Reno, Field Guide
Nevada Noxious Weed Field Guide – Common St. Johnswort Common St. Johnswort is a noxious weed that has been identified by the state of Nevada to be harmful to agriculture, the general public, or the environment. Learn more about this weed. Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Extension, University of Nevada, Reno, Field Guide

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Nevada Noxious Weed Field Guide – Swainsonpea