Wavy leaf thistle, Cirsium undulatum, is a native thistle of the plains and the west of North America (sunflower family, Asteraceae). Thistles are a weird group: some are rare and endangered, some are extremely abundant noxious weeds. Wavy leaf isn't currently protected, but it is closer to being rare than noxious.
|Rosette of wavyleaf thistle|
|Wavyleaf thistle with developing fruits.|
Seeds are essential for genetic variation and to colonize areas farther away, but clones keep population stable.
|They looked like four different small plants, |
but underground they were connected.
|One wavy leaf thistle plant or two in the shade of this tree?|
|Wavy leaf thistle hanging off a slope.|
Comments and corrections welcome.
Kathy Keeler, A Wandering Botanist
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