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Milk thistle flowers isolated on a white background. Top view.
Cotton Thistle, Onopordum acanthium, sometimes posited as the Scotch Thistle, against a natural green background with copy space.
A spring young thistle flower bud
Echinops flower bud.
Nature's resilience: A solitary thistle stands tall amidst the sprawling fields, a testament to its strength and beauty in the face of the elements.  #FieldElegance #NatureResilience
Flowering Milk Thistle (Silybum marianum). Also known as Marian's Thistle, St. Mary's Thistle, Holy Thistle, and Blessed Thistle. Historically used as a medicinal herb. An invasive species in many areas.
Close-up of a Scotch or Scotch thistle flower opening. Onopordum acanthium. Medicinal plant.
Close up of thistle flower heads prior to blooming
Close up macro image of creeping thistle. Cirsium arvense
Close up view of a thistle.
Thistle on a white background
Shot in frisco, tx
Flower of bull thistle, genus Cirsium Vulgare
Purple flowers garden background
Close up of an unopened thistle flower head. Cirsium. Selective focus. Areas out of focus.
close-up of purple thistle in Spain from benidorm
Defocus globe gray Thistle flowers grass wild on green background. Globe-Thistle Flower. Coronavirus molecule. Virus, bacteria. Metaphor and symbol. Biological research. Out of focus.
The Elk Thistle (Cirsium eatonii) is a thistle native to Jackson Hole in Wyoming. As its name implies, elk feed on this plant. It is also called Everts Thistle after Truman Everts, a member of the 1870 Washburn–Langford–Doane Expedition, who explored the area that later became Yellowstone National Park.  Everts became lost and survived for a month by eating the elk thistle.  This elk thistle in bloom was photographed at Oxbow Bend in Grand Teton National Park near Jackson, Wyoming, USA.
Asteraceae  in spring
Close up view of a bee on a thistle flower
An unflowered Scottish thistle.
Scotch (or Scottish) thistle (Onopordum acanthium) is also known as cotton thistle. The photograph shows how it looks in its second year, which is when it grows to measure about 7 feet (over 2 metres) in height.  Scotch thistle is biennial. At first a spiny rosette shows itself while a deep tap root is developing under the soil. In the second year, the large central stem grows and classic and impressive purple thistle flowers grow from June to July. It has been suggested that gardeners might plant this thistle deliberately just for this impressive display, together with its overall attractive pale grey-green colour. The ground in which this thistle flourishes was cleared of brambles just a year ago, with a view to turning the land into allotments for local gardeners. In the meantime, living seeds have developed, and now the area grows foxgloves, opium poppies, scarlet pimpernel, red dead-nettle, Rumex, purple vetch, stinging nettles and groundsel, to name but a few, in addition to the Scotch thistle.
Onopordum illyricum commonly known as borriquero thistle belonging to the compositae family in different stages of flowering pollinated by honey insects
Field thistle.
Flower of wild thistle green buds
green flowers garden background
Different flowers of milk thistle buds isolated on a white background. Silybum marianum.
Purple Thistle flower
Thistle flower and leaves with prickles isolated against white
Close up of Seed heads of coneflower (Echinacea sp.) in late autumn or early winter
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