Ontario
Weeds: Smooth perennial sow-thistle
Table of Contents
- Name
- Other Names
- Family
- General Description
- Habitat
- Similar Species
- Related Links
Name: Smooth perennial sow-thistle, Sonchus
arvensis L. var. glabrescens Guenth, Grab. & Wimm.,
Other Names: laiteron des champs glabre,
Creeping sow-thistle, Field sow-thistle, Perennial sow-thistle, Sonchus
uliginosus Bieb
Family: Composite or Aster Family (Compositae)
General Description: In Smooth perennial
sow-thistle the stems and involucral bracts around the flower heads
are smooth, completely lacking the dark glandular hairs characteristic
of Perennial sow-thistle.
Photos and Pictures
Habitat: Smooth perennial sow-thistle occupies
similar habitats to those of its sister variety. It is common only in
extreme southwestern Ontario and in the northern and northwestern parts
of the province, although it occurs sporadically elsewhere.
Similar Species: Virtually identical to
Perennial
sow-thistle in seedling and juvenile stages, being distinguishable
only after the flower heads begin to form and open.
Related Links
... on general Weed
topics
... on weed identification, order OMAFRA Publication 505: Ontario Weeds
... on weed control, order OMAFRA Publication 75: Guide To Weed Control
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