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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.
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
The plants develop a rosette, with large leaves up to about 40 centimetres (16 inches) long. [6] The seeds are able to germinate between 15 °C to 30 °C, thriving in conditions that offer moist soil and an alternating day/night temperature. [8] A single plant is able to produce around 100 seeds per flower, up to about 20,000 seeds per plant. [8]
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.
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.
Cirsium longistylum, the long-style thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae.The species is found only in the central part of the State of Montana in the United States, in the portions of the Rocky Mountains called the Big Belt, Castle, Elkhorn, and Little Belt ranges.
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 ...
The large, alternate leaves are waxy-lobed, toothed and thorny, as in other genera of thistle. The lower leaves are sessile (attached to the stem without petiole). The upper leaves have a clasping base. They have large, disc-shaped pink-to-purple, rarely white, solitary flower heads at the end of the stem. The flowers consist of tubular florets.