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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 spikes on the margins, mostly in the family Asteraceae. Prickles can also occur all ...
Illustration. Milk thistle is an upright herb that can grow to be 30 to 200 cm (12 to 79 in) tall and has an overall conical shape. [3] The approximate maximum base diameter is 160 cm (63 in).
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] Given its adaptive nature, Cirsium arvense is one of the worst invasive weeds worldwide. Through comparison of its genetic ...
Silybum (milk thistle) is a genus of two species of thistles in the family Asteraceae. [ 1 ] [ 3 ] The plants are native to the Mediterranean regions of Europe , [ 4 ] North Africa , and the Middle East .
It is a tall biennial or short-lived monocarpic thistle, forming a rosette of leaves and a taproot up to 70 cm (28 in) long in the first year, and a flowering stem 1–1.5 m (3 ft 4 in - 4 ft 11 in) tall in the second (rarely third or fourth) year. It can grow up to 1.8 metres (5 ft 11 in) tall. [12]
The flowers are insect pollinated, and various thistle species are widely known as important food sources for butterflies, as well as bees. ... — Asa Gray, “How Plants Grow,” 1858.
The Cardueae are a tribe of flowering plants in the daisy family and the subfamily Carduoideae. [5] Most of them are commonly known as thistles; [6] four of the best known genera are Carduus, [7] Cynara (containing the widely eaten artichoke), Cirsium, [7] and Onopordum.
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.