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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 ...
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. [7] They are annual, biennial, or perennial herbs.
Cirsium is a genus of perennial and biennial flowering plants in the Asteraceae, one of several genera known commonly as thistles. They are more precisely known as plume thistles [citation needed]. These differ from other thistle genera (Carduus, Silybum and Onopordum) in having a seed with a pappus of feathered hairs on their achenes. The ...
Annuals and perennials are also great for different purposes and different garden types. Aul Cervoni is helping us break down the difference between annual vs. perennial plants, in addition to ...
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.
The flowers are insect pollinated, ... — 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 ...
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]
Conversely, perennials come back for many seasons.While the top portion of a perennial dies back in winter, new growth appears the following spring from the same root system.
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