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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 over the plant – on the stem and on the flat parts of the leaves.
Kali tragus, the Russian thistle Leaves of a mature plant coming into flower, each leaf with one flower and two bracts in its axil. Salsola tragus is an annual forb.In habit, the young plant is erect, but it grows into a rounded clump of branched, tangled stems, each one up to about a metre long.
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.
Spear thistle is designated an "injurious weed" under the UK Weeds Act 1959, [19] and a noxious weed in Australia [18] [20] [21] and in nine US states. [22] Spread is only by seed, not by root fragments as in the related creeping thistle C. arvense. It is best cleared from land by hoeing and deep cutting of the taproot before seeds mature ...
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]
Plants of the genus are known commonly as plumeless thistles. [ 3 ] [ 4 ] They are native to temperate Eurasia and North Africa, [ 1 ] and several are known elsewhere as introduced species . [ 4 ] This genus is noted for its disproportionately high number of noxious weeds compared to other flowering plant genera.
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 texanum is a species of plant in the tribe Cardueae within the family Asteraceae found in North America. Common names include Texas thistle, ...