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Scotch Thistle
(Onopordum acanthium L.)
| Growth Habit: Biennial,
sometimes annual, erect, up to 8 ft. tall. Rosette formed first year, flowering stem
elongates second year. |
| Leaves: Large, coarsely
lobed, hairy on both sides, velvety gray appearance. Margins lined with sharp conspicuous
spines. Basal leaves up to 2 ft. long and 1 ft. wide. |
| Stems: Erect, branching,
spiny leaf wings extend down onto stem, covered with dense fine hairs. |
| Flowers: Solitary,
terminal, 1 to 2 inches in diameter, violet to reddish colored. Bracts spine tipped. |
| Roots: Large fleshy
taproot. |
| Seeds: Deep brown to
black, distinctly wrinkled, 3/16" long. |
| Other: Reproduce by seen
only. Dense strands may be impenetrable to recreationists, livestock or wildlife. |
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