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Weed Identification

common mouse-ear chickweed

Family

Caryophyllaceae

Scientific Name

Cerastium fontanum

Other Common Names:

mouse-ear chickweed
mouseear chickweed
cerastium fontanum
big chickweed

Habit

Erect to spreading/mat-forming and can grow up to 0.5 m tall.

Leaves

Leaves are opposite, 1-2 cm long, 3-12 mm wide, without a petiole, and hairy on the upper surface and veins underneath the leaf.

Identifying Characteristics

Has a fibrous root system with opposite leaves that are hairy on the upper surface and on the veins underneath. Has white flowers that appear in clusters with 5 lobed petals and hairy sepals. Stems are from 5 cm to 50 cm long/tall.

Flower Seed Head

Usually appear in clusters of 3 at the end of the stem. Have 5 white petals per flower that are deeply lobed and appear as almost 10 petals and hairy sepals.

Seed Fruit

The capsule is 7-11 mm long and 2-3 mm wide and cylindrical to slightly curved.

Where Found

Native of Euriasia but found throughout the U.S. expect in parts of Texas to California.

Growth Habit

Varies: 
upright and nonwoody
prostrate and nonwoody

Thorns or Spines

not present

Approximate Flower Diameter

Varies: 
pencil
dime

Dominant Flower Color

white

Flower Symmetry

radial symmetery

Leaf Hairs

has hairs

Leaf Shape

Varies: 
round
oval

Leaf Arrangement

opposite

Leaf Margin

entire

Leaf Structure

simple

Leaf Stalk

none

Stem Hairs

has hairs

Stem Cross Section

round or oval

Milky Sap

not present

Root Structure

fibrous

Life Cycle

perennial

Ochrea

not present

Plant Type

Herb