Colorado Thistles: the good, the bad and the ugly Colorado Thistles: the good, the bad and the ugly By Patricia Butler, CO Native Plant Society Boulder Chapter (April 25, 2021) According to Flora of Colorado (Ackerfield 2015, but some species names have recently changed and are noted below), Colorado has 24 native thistles and half a dozen non-native invasives
Know Your Thistles! - Colorado Native Plant Society If you would like to learn to identify the noxious thistles they include Canada thistle, bull thistle, musk thistle, plumeless thistle, and scotch thistle Look these up online to identify them and learn how to manage them
21 Yellow Wildflowers in Colorado (W Pics!) - Bird Watching HQ Spiny Sow-thistle is an invasive yellow wildflower that grows throughout Colorado It can be found in pastures, roadsides, vacant lots, construction sites, grasslands, and waste areas It’s native to Europe, North Africa, and Asia
Sonchus Asper, Prickly Cow Thistle - American Southwest The yellow, dandelion-like flowers form a cluster at the top of the thick, hollow, ridged stems (filled with milky sap); they are composed of up to 150 thin ray florets and dozens of short stamens, branched at the tip, and they have a diameter of one inch when fully open
55 Common Wildflowers in Colorado (Pictures and Identification) The Curlycup Gumweed (Grindelia squarrosa) can be seen in summer and fall in openings and foothills This wildflower can grow several feet in height and width It is a bushy plant with bright yellow flowers The flowers have a strong medicinal smell It is an erect and branched perennial herb growing to more than one hundred centimeters in height
Plants of Lake Pueblo State Park · iNaturalist Plants of Lake Pueblo State Park Positioned approximately six miles west of the City of Pueblo, and within two hour’s drive of Denver and Colorado Springs, Lake Pueblo State Park attracts around 1 8 million visitors each year
Thistles of Colorado Identification and Management Guide The leaf surface of the plant has a distinct center vein with slight pubescence on the topside and more underneath Flower heads are usually solitary on the end of each stem, gumdrop-shaped, one to two inches tall with long, stiff, yellow tipped spines Flowers are generally bright purple but sometimes white in color
NATIVE AND INVASIVE THISTLES OF SAN MIGUEL AND OURAY COUNTIES Phyllaries tipped with a yellow, reflexed (bends away from the flowering head) spine Flowers yellowish-white or rarely, pale lavender or pink; May through September Common on the open grasslands of eastern plains Photo by Kent Pfeiffer
Wildflower identification 3 - Ask Extension The yellow flower is hard to see, but the fruit reminds me of Menodora scabra, rough menodora We found this at Lake Pueblo in June, 2012, after spring rain in May Have not seen it since If the fruit turns a pinkish -red, I've got it right