Ajuga reptans L., ajuga, bugle rampante
Ajuga is a perennial herb, spreading mostly by its vigorous rhizomes. It has stems up to 6 inches (15 cm.) high. Racemes have 6 to 12 blue or purple flowers. This introduced plant has been used as a ground cover, as an ornamental, and as a medicinal plant. It can escape from cultivation and become a troublesome weed locally.
Dracocephalum parviflorum Nutt., American dragonhead, dracocéphale d’Amérique
Annual to biennial, spreading by seeds; plants 1 to 3 feet (3 to 9 dm.) high; flowers irregular, blue to purple; most common in the mid-west; clover fields, gardens, native grassland, clearings, edges of woods, roadsides, and waste places; native to North America.
Galeopsis tetrahit L., hemp-nettle, ortie royale
Annual, spreading by seeds, 1 to 3 feet (3 to 9 dm.) high; flowers irregular, white to purple; throughout; gardens, pastures, barnyards, and waste places; introduced from Europe and Asia.
Glechoma hederacea L., ground-ivy, lierre terrestre
Perennial, spreading mainly by creeping stems that root at the nodes; flowering stems 3 to 10 inches ( 8 to 25 cm.) high; irregular flowers, purple-blue; throughout, but most common in the east; lawns, gardens, and waste places; introduced from Europe and Asia. Sometimes grown as a garden plant, but soon becomes a serious pest.
Leonurus cardiaca L., motherwort, agripaume cardiaque
Rhizomatous perennial 2 to 4 ft. (60 to 120 cm) tall with axillary clusters of small pink to lilac flowers in the upper axils of leaves. Introduced from Europe and Asia for its use as a herbal remedy. It has become sporadically naturalized in pastures, waste ground, disturbed sites, roadsides, and along railway lines throughout our area.
Nepeta cataria L., catnip, herbe à chat
Perennial, spreading by seeds; flowers creamy white or pinkish with pink spots; stems 1.5 to 6 feet (5 to 60 dm) heigh; throughout, but more common in the east, sometimes cultivated; gardens, pastures, hedgerows, fencerows, old fields, roadsides and disturbed areas; crushed foliage is strongly scented. Introduced from Eurasia.
Prunella vulgaris L., heal-all, brunelle commune
Perennial, semi-creeping herb, rooting at the nodes; flowers blue; throughout our area. Some populations are native whereas others are introduced. Often an aggressive weed in lawns. Also occurs in other grasslands, in waste ground, in open woods, and along roadsides.
Stachys palustris L., marsh hedge-nettle, épiaire des marais
A hexaploid perennial with subterranean stolons terminating in crisp, fusiform, whitish or whitish-yellow tubers. Stems 1 to 3 feet (3 to 9 dm.) high; flowers irregular. Introduced from Europe. Known to occur as early as August 1815 near Amherst, Maine. It is now locally common in moist habitats in southeastern Canada and in the northeastern United States. Marsh hedge-nettle tubers often penetrate potatoes growing in fields. This makes these potatoes virtually unsaleable.
Text and photos of catnip by Stephen J. Darbyshire
Click on a photo to view an enlarged image.
| Weed Name | Photo | Weed Name | Photo |
| ajuga, bugle rampante |  |
ajuga, bugle rampante (vegetative in lawn) |
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| ajuga, bugle rampante |  |
ajuga, bugle rampante |  |
| American dragonhead, dracocéphale d’Amérique (F&M) |
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American dragonhead, dracocéphale d’Amérique |  |
| American dragonhead, dracocéphale d’Amérique (2 seedlings) |
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American dragonhead, dracocéphale d’Amérique (young plant) |
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| hemp-nettle, ortie royale |  |
hemp-nettle, ortie royale (seedlings) |
.JPG) |
| hemp-nettle, ortie royale (NC) |  |
hemp-nettle, ortie royale (F&M) |  |
| ground-ivy, lierre terrestre |  |
ground-ivy, lierre terrestre |  |
ground-ivy, lierre terrestre (close up) |  |
ground-ivy, lierre terrestre (take-over of lawn) |
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| ground-ivy, lierre terrestre (rooting at nodes) |
.JPG) |
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| catnip, herbe à chat (plants) |
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motherwort, agripaume cardiaque |  |
| motherwort, agripaume cardiaque |  |
motherwort, agripaume cardiaque |  |
| catnip, herbe à chat (flowers) |
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heal-all, brunelle commune | .JPG) |
| heal-all, brunelle commune |  |
heal-all, brunelle commune (3 seedlings) |
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| marsh hedge-nettle, épiaire des marais (NC) |
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marsh hedge-nettle, épiaire des marais (pressed inflorescence) |
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| marsh hedge-nettle, épiaire des marais (pressed inflorescence) |
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marsh hedge-nettle, épiaire des marais (pressed inflorescence) |
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| marsh hedge-nettle, épiaire des marais (pressed inflorescence) |
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marsh hedge-nettle, épiaire des marais (stem hairs stiffly reflexed) |
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| marsh hedge-nettle, épiaire des marais (stem hairs stiffly reflexed) |
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marsh hedge-nettle, épiaire des marais (underground tubers) |
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| marsh hedge-nettle, épiaire des marais (note spiny-tipped calyx lobes) |
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marsh hedge-nettle, épiaire des marais (photo by Daniel Savoie) |
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| marsh hedge-nettle, épiaire des marais (photo by Gavin Graham) |
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marsh hedge-nettle, épiaire des marais (photo by Daniel Savoie) |
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| marsh hedge-nettle, épiaire des marais (photo by Gavin Graham) |
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marsh hedge-nettle, épiaire des marais (underground rhizomes with tubers; photo by Daniel Savoie) |
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| marsh hedge-nettle, épiaire des marais (two plants with tubers; photo by Daniel Savoie) |
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