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Wavyleaf Thistle
Cirsium undulatum
About Wavyleaf Thistle (Cirsium undulatum) 0 Nurseries Carry This Plant Cirsium undulatum is a species of thistle known by the common names wavyleaf thistle and gray thistle. It is native to much of central and western North America from British Columbia east to Manitoba and south as far as the State of Durango in Mexico. It has also been found outside of its native range as an introduced species. Cirsium undulatum is widespread and found in many habitat types. It is a perennial herb exceeding 200 cm (79 in) in height. The stem branches a few times toward the top of the plant if at all. The leaves are very wavy along the edges and usually cut into shallow toothed lobes. The longest near the base of the plant are up to 30 centimetres (12 inches) long. The inflorescence holds one or more flower heads each up to 5 centimetres (2. 0 inches) long and wide. The head is lined with spiny phyllaries of different shapes. The flowers in the head are white to lavender to pink and up to 5 centimetres (2. 0 inches) long. The fruit is an achene a f
Plant Description
Plant Type
Plant Type
Perennial herb

6.6 ft tall

Flower Color
Flower Color
Pink, Purple

Wildlife Supported

Landscaping Information
Natural Setting
Annual Precipitation: 10.4" - 24.4", Summer Precipitation: 0.29" - 1.36", Coldest Month: 28.6" - 53.6", Hottest Month: 60.1" - 79.8", Humidity: 0.93" - 24.33", Elevation: 465" - 5334"

Alternative Names
Common Names: Gray Thistle, Wavy-leaved Thistle

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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