|Also known as:||Button Eryngo, Button Snakeroot|
|Habitat:||sun; moist to dry sandy, loamy soil; prairies, open woods|
|Bloom season:||July - August|
|Plant height:||2 to 5 feet|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Whitish green globe-like flowerheads, ½ to ¾ inch wide, are arrayed in an orbital cluster at the end of a tall, smooth stalk. Each flower head is composed of numerous small flowers with 5 white petals, notched at the tip, 2 long white styles, and 5 white stamens with greenish to brown tips. Surrounding each flower are prickly floral bracts. At the base of the flower head is a whorl of leafy bracts, lance-like and prickly. A plant has a few to many clusters from the leaf axils and on branching stems in the upper part of the plant.
Leaves are mostly basal, long and sword-like with parallel veins and tapering to a sharp point, up to 2½ feet long and only 1 inch wide with a few smaller leaves ascending the stem. Stem leaves are stiff, clasp the stem and typically wrap around it. Leaf surfaces are waxy, the edges either smooth or commonly with widely spaced, fine spiny teeth. Stems are hairless, blue-green, waxy, and ridged.
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Photos by K. Chayka taken in Dodge county. Photos courtesy Peter M. Dziuk taken in Dodge county and a residential garden in Anoka county.
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