wavyleaf thistle
Asterales > Asteraceae > Cirsium undulatum (Nutt.) Spreng
Synonym(s): gray thistle, wavy-leaf thistle,

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Number:1211063
Description: Flower(s); close-up of purple flower "balls"
Photographer:Dave Powell, USDA Forest Service
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Invasive Reference(s)

Subject Reference(s)

  • USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA. - http://plants.usda.gov/