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Cirsium arizonicum

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About Arizona Thistle (Cirsium arizonicum) Cirsium arizonicum (Arizona thistle) is a North American species of thistle in the sunflower family, native to the southwestern United States and northwestern Mexico. It has been found in Arizona, southeastern California, New Mexico, Nevada, Colorado, Utah, Sonora, and northwestern Chihuahua. Cirsium arizonicum is a herbaceous plant that can be either biennial or perennial, reaching 30-150 cm in height. The spiny leaves are oblong-obovate with pinate lobes; the basal leaves are larger, 10-40 cm long, while leaves on the upper stem can be only 3 cm long. The inflorescence is 3-4 cm in length and 1. 5-2 cm diameter, red to pink or purple, with all the florets of similar form (no division into disc and ray florets); individual plants are very variable in the number of heads produced, from one to 100. Flowering is from mid spring to mid fall. The species occurs in mountains, at elevations of 900-3,600 m.
Plant Description
Plant Type
Perennial herb

Max. Height
1 - 4.9 ft (0.3 - 1.5 m)

Flower Color
Pink, Purple, Red

Native Status

Natural Setting
Elevation ?
5229' - 14328'

Annual Precip. ?
6.5" - 58.9"

Summer Precip. ?
0.88" - 2.79"

Coldest Month ?
18.0° F - 45.1° F

Hottest Month ?
38.6° F - 69.2° F

Humidity ?
1.73 vpd - 24.01 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

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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