A guide to nonnative invasive plants inventoried in the north by ...
A guide to nonnative invasive plants inventoried in the north by ...
A guide to nonnative invasive plants inventoried in the north by ...
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Cirsium vulgare<br />
Bull thistle CIVU<br />
Form: Biennial herb up <strong>to</strong> 6½ ft (2 m) tall. Erect and bushy;<br />
stem s<strong>to</strong>ut, often branched, and hairy; conspicuously sp<strong>in</strong>y;<br />
w<strong>in</strong>ged <strong>by</strong> <strong>the</strong> decurrent leaf bases.<br />
Leaves: Oblong <strong>to</strong> lanceolate; green with coarse hairs<br />
on upper side, grayish-green with woolly gray hairs on<br />
underside. Long, po<strong>in</strong>ted, yellow sp<strong>in</strong>es extend from <strong>the</strong><br />
leaf blade at midrib and at each lobe. Leaf bases extend<br />
downward on stem form<strong>in</strong>g long prickly w<strong>in</strong>gs.<br />
Flowers/fruit: Purple, 1-2 <strong>in</strong>. (2.5-5 cm) <strong>in</strong> diameter, densely<br />
discoid borne s<strong>in</strong>gly at <strong>the</strong> tip of a stem. Fruits are achenes,<br />
light brown, usually with darker streaks,
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