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Milk thistle flowerhead Cirsium arizonicum, showing arachnoid cobwebbiness on stems and leaves, with ants attending aphids that might be taking advantage of the shelter. Thistle is the common name of a group of flowering plants characterized by leaves with sharp prickles on the margins, mostly in the family Asteraceae. Prickles can also occur ...
Cirsium erisithales, the yellow thistle [2] or yellow melancholy thistle, is a perennial herbaceous plant in the tribe Cardueae within the family Asteraceae. [ 3 ] Description
Thomas Nuttall (1786-1859) described var. megacanthum as "one of the most terribly armed plants in the genus." [8] [9] Cirsium horridulum is a biennial herb up to 250 centimetres (100 in) tall, with a large taproot and fleshy side roots that sometimes sprout new shoots. Leaves are up to 40 centimetres (16 in) long with thick, sharp spines along ...
Cirsium vulgare (spear thistle) is listed in the United States (where as a non-native invasive species it has been renamed "bull thistle") as a noxious weed in nine states. [6] Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as bees and butterflies.
Silybum marianum is a species of thistle.It has various common names including milk thistle, [1] blessed milkthistle, [2] Marian thistle, Mary thistle, Saint Mary's thistle, Mediterranean milk thistle, variegated thistle and Scotch thistle (not to be confused with Onopordum acanthium or Cirsium vulgare).
C 3 plants lose 97% of the water taken up through their roots to transpiration. [13] Creeping thistle is a herbaceous perennial plant growing up to 150 cm, forming extensive clonal colonies from thickened roots that send up numerous erect shoots during the growing season. [14] It is a ruderal species. [15]
— Asa Gray, “How Plants Grow,” 1858 Thistles are a marvelous group of plants. Botanists place them all as members of the sunflower (or aster) family, which is a truly gargantuan group with ...
Separate cypselae. Onopordum acanthium (cotton thistle, Scotch (or Scottish) thistle) is a flowering plant in the family Asteraceae.It is native to Europe and Western Asia from the Iberian Peninsula east to Kazakhstan, and north to central Scandinavia, and widely naturalised elsewhere, [1] [2] [3] with especially large populations present in the United States and Australia.