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Invasive Plants
- Perennial Sow Thistle
- Creeping Thistle
- Oxeye Daisy
- Common Tansy
- Spotted Knapweed
- Narrowleaf Hawksbeard
- Scentless Chamomile
- Leafy Spurge
- Foxtail Barley
- Altai Wild Rye
- Crested Wheat Grass
- Smooth Brome
- Quackgrass
- Reed Canary Grass
- Bird Vetch
- Lucerne
- Sweetclover
- Greater Butter-and-Eggs
- Dalmatica Toadflas
Narrowleaf Hawksbeard
Common name: Narrowleaf Hawksbeard
Scientific name: Crepis tectorum
Family: Asteraceae
Description
Unlike the similar dandelion, this annual plant grows a single, sometimes branched stem from a small taproot that is easily pulled. The normally 20 to 60 cm high plant contains a milky juice. The alternate leaves get smaller toward the top. Basal leaves are stalked and toothed; stem leaves are stalkless and mostly linear. The numerous flowers are yellow.
Range in Yukon
Narrowleaf Hawksbeard occurs throughout Yukon along all the major highways. This species has been found over 1 km from roadways and along rivers. This plant does not compete well in undisturbed sites, but readily colonizes frequently disturbed sites such as roadsides and rivers.
Similar Species
Spiny sow-thistle (Sonchus asper) is known only from Haines Junction and the Labiche River. This is also an annual plant with a short taproot.
Ecological Impact
Each plant produces more than 49,000 seeds and open areas and disturbed sites are readily colonized.
Control
Annual plants require prevention of seed production and prevention of dispersal. Narrowleaf Hawksbeard is easily pulled up by hand. The plants will continue to mature after being pulled. Mechanical and chemical methods can also be used to control this plant. It is a prolific seed producer that once established is hard to remove.
Contact Environment Yukon Government of Yukon Box 2703 (V-5N) Bruce Bennett, Wildlife Viewing Biologist Phone: 867-667-5331 Email: bruce.bennett@gov.yk.ca |