Cerastium

Cerastium is a genus of plants belonging to the family Caryophyllaceae, commonly known as mouse-ear chickweeds. These plants are typically herbaceous annuals or perennials, though some species can exhibit a subshrub growth habit. They are found in temperate and arctic regions throughout the world.

Description

Cerastium species are characterized by their small, often white, star-shaped flowers, which typically bloom in spring and summer. The flowers usually have five deeply notched petals. The leaves are typically opposite and ovate or lanceolate in shape. The stems are often hairy, giving the plants a soft, downy appearance.

Habitat and Distribution

Mouse-ear chickweeds are found in a wide range of habitats, including meadows, grasslands, woodlands, and disturbed areas. They are particularly well-adapted to dry, well-drained soils. The distribution of Cerastium species is global, with a high concentration in temperate regions. Some species are considered invasive in certain areas.

Uses

While not widely cultivated, some Cerastium species, such as Cerastium tomentosum (snow-in-summer), are grown as ornamental ground cover plants. They are valued for their silver-grey foliage and profuse white flowers. Certain species have also been used in traditional medicine, though scientific evidence supporting these uses is often limited.

Taxonomy

The taxonomy of Cerastium can be complex, with many species and subspecies described. Identification can be challenging due to morphological similarities between species.