| Arizona Thistle Flowering Plant, Cirsium arizonicum. With Two-Tailed Swallowtail Butterfly, Papilio multicaudata. Photos Taken August 27, 2008. Yarnell, Arizona. |
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| Arizona Thistle Flower. Cirsium arizonicum. | Arizona Thistle Flower. Cirsium arizonicum. |
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| Arizona Thistle Plants. Cirsium arizonicum. | Arizona Thistle Leaf. Cirsium arizonicum. |
Arizona Thistle.
We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Arizona Thistle is a herbaceous plant that can be either a biennial or perennial, reaching about 4 feet in height. Cirsium arizonicum is native to the southwestern United States, including Arizona, southeastern California, New Mexico, Nevada, and Utah. Its oblong - obovate leaves are pinnately - lobed with pinate lobes. Its basal leaves are 3/8 inch to 1 1/2 inch long. Arizona Thistle blooms in Arizona from May to October and grows at elevations from about 3000 to 7000 feet pinion pine, chaparral, or shrub oak forests. The inflorescence is 1 1/4 inch to 3 inches in length. They are about 5/8 inch to 7/8 inches in diameter, They are red to pink or purple in color, with all the florets of similar form. Each plant varies in the number of inflorescences produced, from one to about 100. Five sub species have been identified, they are:
Cirsium arizonicum var. arizonicum.
Quick Notes:
Height: Up To About 4 Feet Tall.
Flowers: Flowers range from Color, red to pink or purple. An inflorescence: flowerhead formed of many flowers. Flowers emerge from a round, spiky ball that gets to about 1-inch diameter; flowers have long, upright petals that stand straight out.
Stalk: Several, erect or ascending, glabrous to thinly arachnoid-tomentose with fine non-septate trichomes and/or villous with septate trichomes, sometimes � glabrate; branches 0�many, ascending.
Flowering Time: May - October, in Yarnell, Arizona.
Fruit: The fruit is an achene with a bristly pappus 0.6 to 0.8 inch long.
Seeds: The seed has tufts of tiny hair, or pappus, which can carry them far by wind.
Leaves: The oblong - obovate leaves are pinnately - lobed with pinate lobes. Its basal leaves are 3/8 inch to 1 1/2 inch long.
Found: Native to the southwestern United States, including Arizona, southeastern California, New Mexico, Nevada, and Utah. Normally in pinion pine, chaparral, or shrub oak forests.
Hardiness:
Soil pH requirements:
Sun Exposure:
Elevation: 3,000 - 7,000 Feet.
Habitat: Commonly found in sandy to gravelly washes.
Miscellaneous: Flowering Photos Taken August 27, 2008. Yarnell Arizona, at 4,800 feet.
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