About Geranium rotundifolium L.
Geranium rotundifolium, commonly known as round-leaved crane's-bill, is an annual herb species belonging to the Geraniaceae family. It is native to temperate regions across most of Europe, northern Africa, and southwestern Asia, and its distribution is currently spreading northward as a response to global warming. This species prefers dry, sandy or stony habitats, which include old walls, rail ballast, and building rubble, even in urban areas. Its basal leaves are simple, measuring 3–6 cm across, and are broadly rounded and kidney-shaped with shallowly lobed margins; leaves growing higher on the stem are smaller and have deeper lobing. Flowering stems of this species can reach up to 20 cm in height; both stems and leaves are covered in hairy glandular hairs. The flowers are small, 10–16 mm in diameter, and pink, with five petals that have a rounded to shallowly two-lobed apex. This differs from similar related species, which have petal apexes with deeper notches. Known flower visitors to Geranium rotundifolium include sweat bees, Small Carpenter Bees, Myopa, and cabbage butterfly.
