Thistles - introduced.

Thistles are members of the daisy family. Some or all of their leaves, stems and flower heads are spiny with sharp spines that can pierce skin.

Winged Thistle (*Carduus pycnocephalus) Slender thistle. Stems with continuous spiny wings

Slender Thistle (*Carduus tenuiflorus) Slender thistle. Like Winged Thistle but stems not continuously winged.

Spear Thistle. (*Cirsium vulgare) All parts spiny. Erect. Flowers solitary or few. Very common.

Spear Thistle. (*Cirsium arvense) All parts spiny. Many-flowered. Uncommon.

Artichoke Thistle (*Cynara cardunculus). Large showy flower heads.

Blue Devil (Erygium ovinum). Prickly-looking plant with most parts becoming blue. Benign.

Stemless Thistle (*Onopordum acaulon). Flower stalkless from prickly leaf rosette.

Illyrian Thistle (*Onopordum illyricum). Erect thistle.

Golden thistle (*Scolymus hispanicus.) Thistle with yellow flowers.

Variegated Thistle (*Silybum marinum.) Basal leaves with white veins.

St Barnaby's Thistle (*Centaurea solsitialis) Slender spines at right angles. Rare.