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Cirsium oleraceum, the cabbage thistle [3] or Siberian thistle, is a species of thistle in the genus Cirsium within the family Asteraceae, native to central and eastern Europe and Asia, where it grows in wet lowland soils. [4] Cirsium oleraceum is a herbaceous perennial plant growing to 1.5 m tall, the stems unbranched or with only a very few ...
The cardoon (Cynara cardunculus / ˈ s ɪ n ər ə k ɑːr ˈ d ʌ n k j ʊ l ə s /), [2] [3] also called the artichoke thistle, is a thistle in the family Asteraceae. It is a naturally occurring species that also has many cultivated forms , including the globe artichoke .
Large plants have some branches along the upper portion of their stems. [3] The leaves along the stem are alternate and measure up to 23 cm (9 in) long and 8 cm (3 in) wide. [ 4 ] Leaves vary in shape, with larger leaves generally lanceolate , and smaller leaves elliptic.
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.
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. These prickles protect the plant from herbivores.
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 palustre is a tall thistle which reaches up to 2 metres (7 ft) in height. The strong stems have few branches and are covered in small spines. In its first year the plant grows as a dense rosette, at first with narrow, entire leaves with spiny, dark purple edges; later, larger leaves are lobed.
The stiff leaves are usually pinnate with strong, yellow spines; the lowest leaves are up to 80 cm (30 in) long. The leaf margins are rolled over and the underside of the leaf is felted with white hair. The inflorescence is cymose with a few large flowers with a diameter of up to 7 cm (3 in). These are globular and densely covered with woolly hair.