Chamomile, Scentless , Matricaria perforata

Life Cycle

It is a short-lived perennial or sometimes annual.

Stems

Its stems below the flower heads are smooth and hairless, and the whole plant is virtually without odour.

Flowers and Fruit

Large yellow-centered flower heads with white ray florets.

Habitat

It occurs sporadically in Ontario in waste places and roadsides, but is becoming a significant weed in pastures and some cultivated fields.

Distinguishing Features

Scentless chamomile closely resembling Stinking mayweed with its large yellow-centered flower heads with white ray florets, but it is usually taller (up to 75 cm, 30 in.) and more branched. Its stems below the flower heads are smooth and hairless, and the whole plant is virtually without odour.

Often Mistaken For

Very similar to both Pineappleweed and Stinking mayweed.


Figure #1.


Figure #10.

Field Photo #2. Scentless chamomile in flower, mid-June in Southwestern Ontario.


Figure #11.

Root of chamomile. Note the large size and depth of the root clump making management with herbicides virtually impossible. Tillage with a moldboard plough is needed to manage.


Figure #12.

Uprooted scentless chamomile.


Figure #2.

Scentless chamomile seedling.


Figure #3.

Feather-like leaf of scentless chamomile.


Figure #4.

Large, yellow-centred flower head of flower with white ray florets.


Figure #5.

Large, yellow-centred flower head with white ray florets.


Figure #6.

Stem below the flower head is smooth and hairless.


Figure #7.


Figure #8.

This photo compares the ox-eyed daisy leaf and the scentless chamomile leaf - two species which can appear similar from a distance. Note the smaller size and more feather-like appearance of the chamomile leaf.


Figure #9.

Field photo #1. Scentless chamomile, mid-June in Southwestern Ontario.