Ontario
Weeds: Pineappleweed
Table of Contents
- Name
- Other Names
- Family
- General Description
- Stems and Roots
- Flowers and Fruit
- Habitat
- Similar Species
- Related Links
Name: Pineappleweed, Matricaria matricariodes
(Less.) Porter,
Other Names: matricaire odorante, matricaire
suave, Chamomilla suaveolens Rydb.
Family: Composite or Aster Family (Compositae)
General Description: Annual, reproducing
only by seed.
Photos and Pictures
Stems & Roots: Stems erect, much-branched,
5-40cm (2-16in.) high, smooth, hairless; leaves very finely dissected,
light green, smooth, hairless and slightly fleshy, alternate (1 per
node)
Flowers & Fruit: Flower heads small,
conic or egg-shaped, 5-9mm (1/5-¾in.) across, yellowish-green,
and without ray florets. The whole plant, and especially the flower
heads, when crushed has a distinct pineapple-like odour, hence the
common name. Flowers from spring until autumn.
Habitat: Pineappleweed occurs throughout
Ontario, especially around farmyards, waste places and roadsides.
It is an occasional weed in the compacted soil along the edges of
pathways. Also see Prostrate
knotweed.
Similar Species: It is distinguished by
its small stature, its small flower heads without white ray florets,
its smooth hairless stems below the flower heads, and its pineapple
odour.
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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