Stem

  • Up to 5 ft. tall and covered with short hairs
Photo of Swainsonpea plant

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
Photo of Swainsonpea plant with pink flowers

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 
Photo of Swainsonpea plant with pink flowers

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)

 

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
African mustard plant
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
Photo of common crupina stem
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
Photo of Common St. Johnswort plant
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
 

Associated Programs

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Master Gardeners of Washoe County

Master Gardeners provide free, research-based horticulture information to Nevadans.

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Master Gardeners of Nevada

Program trains local gardeners to provide research-based horticulture information to Nevadans

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Integrated Pest Management

Integrated Pest Management program is a long-term management strategy that uses a combination of tactics to reduce pests to tolerable levels with potentially lower costs for the pest manager and minimal effect on the environment.