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:

 
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B. Schultz, S. Foster 2021, Extension, University of Nevada, Reno, SP-21-03
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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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Crimson fountaingrass 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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