Description ⁴

This plant can grow annual or biennial and sometimes even a short-lived perennial. It has numerous small and daisy-like flowers. Lower leaves disappear by flowering time. Stem leaves are dill-like, finely divided into short, thread-like segments. They don’t smell when crushed.

Range in Yukon ⁴

Scentless Chamomile has been found throughout the southern Yukon including Haines Junction, Whitehorse, Ross River, Teslin, Nisutlin, and Watson Lake. It has also been found along highways and other road system far away from communities. It is considered a noxious weed in all regions of BC.

Similar Species ⁴

Seaside Chamomile (T. maritimum) is a rare plant on the Yukon arctic coast. Pineapple Weed (M. discoidea) is another introduced plant that lacks petals and has a strong odor when crushed.

Ecological Impact ⁴

Scentless Chamomile is unpalatable to livestock and can form dense stands in pastures. It is likely to alter soil moisture and nutrient availability for other plants

Control ⁴

Hand-pulling can be effective in small infestations. Seed production can be lowered if plants are mowed before they flower. Seeds do not produce pappus (fluff – like dandelions) and so does not spread as easily as many other species in the daisy family. Since the plants do not compete well with vigorous plants, encouraging competitive plant growth may also be used to control infested areas. To date all Yukon known infestations have been small and easily eradicated.

For more information visit: Yukon Invasive Species Council

Sources and Credits

1. (c) Radio Tonreg, some rights reserved (CC BY), http://www.flickr.com/photos/tonreg/8236698861/
2. (c) anonymous, some rights reserved (CC BY-NC), http://www.biopix.com/photos/JCS-Tripleurospermum-inodorum-64508.JPG
3. (c) anonymous, some rights reserved (CC BY-NC), http://www.biopix.com/PhotosMedium/JCS%20Tripleurospermum%20perforatum%2047389.JPG
4. (c) L.G. Johanson, some rights reserved (CC BY-SA)

More Info

• iNaturalist.ca taxon page
• Atlas of Living Australia
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Calflora
• CalPhotos
• eFloras.org
• Flora Digital de Portugal
• Flora of North America (beta)
• Global Biodiversity Information Facility (GBIF)
• Go Botany
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• Jepson eFlora
• Maryland Biodiversity Project
• NatureServe Explorer 2.0
• NBN Atlas
• New Zealand Plant Conservation Network
• OregonFlora.org
• SEINet Symbiota portals
• Tropicos
• USDA PLANTS database
• VASCAN by Canadensys
• World Flora Online
• 日本のレッドデータ検索システム
• 植物和名−学名インデックス YList

Range Map

(c) NatureServe, some rights reserved (CC-BY-NC)

iNaturalist.ca Map