|yellow starthistle|| USDA PLANTS Symbol: CESO3
U.S. Nativity: Exotic
|Centaurea solstitialis L.|
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
|Synonym(s): yellow star thistle, yellow star-thistle|
|Native Range: Africa, temp. Asia, Europe (GRIN);|
Yellow starthistle is an annual that can grow from ¼ - 3 ft. (0.1-1 m) in height. Leaves near the base are petiolate, dissected, 2-6 in. (5-15 cm) long and usually absent at time of flowering. Leaves further up the stem are decurrent, entire and 0.4-4 in. (1-10 cm) long. Flowering occurs from June to October, when yellow flowers appear in heads at the tips of the branches. Bracts that subtend the flower head have a small cluster of spines and a stout central spine 0.4-1 in. (10-25mm) in length. Yellow starthistle was accidentally introduced into the United States in the mid- 1800’s as contaminate of alfalfa seed. Yellow starthistle invades woodlands, pastures, roadsides and fields.
Identification, Biology, Control and Management Resources
|Selected Images from Invasive.org||View All Images at Invasive.org|
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.
|U.S. National Parks where reported invasive:|
|Death Valley National Park (California)|
Grand Canyon National Park (Arizona)
Redwood National Park (California)
Sequoia and Kings Canyon National Parks (Californina)
Yosemite National Park (California)