Ontario Weeds: Plumeless Thistle
Table of Contents
- Name
- Other Names
- Family
- General Description
- Leaves
- Flowers and Fruit
- Habitat
- Similar Species
- Related Links
Name: Plumeless thistle, Carduus acanthoides
L.
Other Names: CRUAC, chardon épineux,
Welted thistle
Family: Composite or Aster Family (Compositae)
General Description: Very similar to
Nodding thistle with its deeply lobed, spiny leaves
Photos and Pictures
Plumeleses thistle. A. Stand of plants
Plumeleses thistle. B. flower head.
Plumeless thistle. A. Rosette and lower stem leaves. |
B. Flowering branch with flower heads on spiny-winged stalks.
|
Leaves: Distinguished from Nodding
thistle by usually having the lobes or clusters of lobes separated
from each other by distinct spaces along the midrib of the leaf. The
inner margins of these spaces usually with smaller and fewer spines
than on the lobes.
Flowers & Fruit: Flower heads smaller
(usually less than 2.5cm, 1 in. wide) and clustered or sometimes solitary
but on shorter stalks which are spiny-winged right to the base of
the head. The incolucral bracts surrounding its flower heads are narrower
and more numerous than in Nodding thistle and mostly point upward
rater than outward or backward.
Habitat: Plumeless thistle occurs throughout
southern Ontario in siliar habitats to Nodding thistle and, where
the two occasionally grow in the same locality, hybride are often
produced having characteristics intermediate between the two species.
Similar Species: Very similar to Nodding
thistle.
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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