Ontario Weeds: Mouse-eared chickweed
Excerpt from Publication 505, Ontario Weeds, Order this publication
Table of Contents
- Other Names
- General Description
- Stems and Roots
- Flowers and Fruit
- Similar Species
- Related Links
Name: Mouse-eared chickweed, Cerastium
fontanum Baumg. ssp. triviale (Link) Jalas
Other Names: céraiste vulgaire, céraiste commun, Cerastium vulgatum L.
Family: Pink Family (Caryophyllaceae)
General Description: Annual or more usually perennial, reproducing by seed and by horizontal stems which root at the nodes and form dense patches.
A. Plant. B. Section of stem with pair of leaves. C. Tip of branch with 2 seedpots.
Stems & Roots: Stems - nearly
prostrate, as much as 50cm (2ft) long, with short upright branches,
or stems erect if growing amongst taller plants, densely but very
finely hairy, soft, often slightly sticky to the touch, dark green,
round in cross-section with swollen nodes;
Leaves: Opposite (2 per node), stalkless, ovate (1-2cm, 2/5-4/5in. long) with pointed tips and covered with hair up to 2mm (1/12in.) long (hence the name "mouse-eared").
Flowers & Fruit: Flowers white, in compact groups or spreading out with long branches and flower stalks up to 12mm (½in.) long, sepals 5, green, hairy, (about as long as the 5 white, deeply notched petals), 4-6mm (1/6-¼in.) long; seedpod cylindrical and straight or slightly curved, 8-10mm (1/3-2/5in.) long, light or straw-coloured, opening at the end with 10 small teeth and releasing many, tiny, reddish-brown, roundish to 4-sided seeds about 0.75mm (1/30in.) long. Flowering and seed-set continue from late spring until freeze-up in autumn.
Habitat: Mouse-eared chickweed is common throughout Ontario and occurs in almost any kind of habitat including gardens, lawns, fields, pastures, meadows, wet depressions, rock outcrops, dry sandy areas, and under moist woods. It is one of the most common and persistent weeds of lawns and occasionally is thick enough to be troublesome in gardens and fields.
Similar Species: It is distinguished from other chickweeds, Grass-leaved stitchwort and Thyme-leaved sandwort by its distinctly hairy stem and stalkless leaves covered with long hair on both surfaces, and its cylindrical, light-coloured seedpods.
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