Ontario Weeds: Plumeless
Table of Contents
- Other Names
- General Description
- Flowers and Fruit
- Similar Species
- Related Links
Name: Plumeless thistle, Carduus
Other Names: CRUAC, chardon épineux,
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
Similar Species: Very similar to Nodding
... on general Weed
... on weed identification, order OMAFRA
Publication 505: Ontario Weeds
... on weed control, order OMAFRA
Publication 75: Guide To Weed Control
to the Ontario Weeds Gallery |