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AGAVE AND YUCCA | CACTI | WILDFLOWERS

Cirsium Undulatum, Wavy-Leaf Thistle


Plants > Wildflowers > Asteraceae > Cirsium Undulatum
Wavy-Leaf Thistle; Cirsium undulatum in the Abajo Mountains, Utah
Cirsium undulatum in the Abajo Mountains, Utah
Common names:
Wavy-leaf thistle, pasture thistle
Family:
Aster (Asteraceae)
Scientific name:
Cirsium undulatum
Main flower color:
Pink
Range:
All the western states; less common in the far west
Height:
Up to 7 feet
Habitat:
Prairie, grassland, semi-deserts, woodland, disturbed areas, from near sea level to 9,000 feet
Leaves:
Ovate to oblong, up to 15 inches long and 4 inches across, with wavy, spiny margins
Season:
May to October
Pintrest
The dark green phyllaries are the most distinctive feature of cirsium undulatum; the outer faces have a prominent white ridge down the middle - often relatively wide though sometimes narrow - and their tips terminate in a spine, angled away from the involucre. Phyllaries are in 8 to 12 rows, becoming longer and narrower towards the top. The color of the disc florets ranges from white to pale pink to purple, and their length from 1 to 2 inches. The corolla lobes are about half as long as the corolla tubes. Plants produce up to ten flowerheads, in an open, branched, terminal cluster.

Stems are stout and erect, reaching a height of 7 feet or more. They are densely covered by greyish-white hairs. Branches, if present, are few in number, and only on the upper part of the stem. Leaves are lined by teeth or lobes, deep or shallow, widely or closely spaced. Lobes terminate in a yellowish spine, up to half an inch long. Leaf margins are conspicuously wavy. The upper leaf surfaces have a sparse hair covering, while the lower surfaces are more densely covered.




Flowerhead and bud
Flowerhead and bud
Wavy-Leaf Thistle
Pink florets
Stem and leaves
Stem and leaves
Flowerhead
Flowerhead
Wavy-edged leaf
Wavy-edged leaf
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