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2. Thistle - Wikipedia

   en.wikipedia.org/wiki/Thistle

   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 prickles on the margins, mostly in the family Asteraceae. Prickles can also occur ...

3. Cirsium vulgare - Wikipedia

   en.wikipedia.org/wiki/Cirsium_vulgare

   Cirsium vulgare, the spear thistle, bull thistle, or common thistle, is a species of the Asteraceae genus Cirsium, native throughout most of Europe (north to 66°N, locally 68°N), Western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains).

4. Cirsium - Wikipedia

   en.wikipedia.org/wiki/Cirsium

   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.

5. Goldfinches love to feed on this abundant thistle | Mystery Plant

   www.aol.com/goldfinches-love-feed-abundant...

   Our Mystery Plant (Tall thistle, Cirsium altissimum) is a thistle, and I was able to enter a patch of this stuff on a recent field trip in the upstate of South Carolina. Spiny stuff! It is, in ...

6. Cirsium arvense - Wikipedia

   en.wikipedia.org/wiki/Cirsium_arvense

   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]

7. Cirsium horridulum - Wikipedia

   en.wikipedia.org/wiki/Cirsium_horridulum

   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 ...