Weeds Identification Gallery

Bristly Mallow

  • Modiola caroliniana
  • Mallow Family: Malvaceae
Updated: 12/2025

Bristly mallow is a low-growing, bristly-haired broadleaf perennial plant that sometimes behaves as an annual or biennial. It inhabits turf, alfalfa fields, and other disturbed places throughout California, except deserts and the Great Basin, to about 1300 feet (400 m).

Seedling

Cotyledons (seed leaves) are roundish. First leaves have lobed edges.

Bristly mallow    Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources
Seedling. Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources

Mature Plant

Bristly mallow stems grow prostrate or spreading up to about 20 inches (50 cm) long and root at lower stem joints (nodes) that are in contact with the ground. Leaves are highly variable. They range from egg shaped to palm shaped with deep lobes, to deeply divided with deep lobes. The leaf surface and edges are coarsely toothed.

Green, lobed leaves scattered among grass blades. Copyright information is at the bottom (UC Statewide IPM Project Copyright 2000 Regents, University of California). Credit: Jack Kelly Clark, UC IPM
Infestation in turf. Credit: Jack Kelly Clark, UC IPM

Flowers

Flowers develop singly at the bases of leaves, are orange to dull violet-red, and less than 1/2-inch (13 mm) wide in summer.

Lush green foliage with a single small pink-orange flower with a yellow center and several round seed pods. Copyright information is at the bottom (Copyright 2007 The Regents of the University of California. All rights reserved.). Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources
Flowers and leaves. Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources

Fruits

The fruiting head resembles a miniature wheel of cheese with wedge-shaped sections that break apart into individual fruit after maturity. Each fruit is shaped like the letter "C", has long hairs and two hornlike beaks on the back. Within the Fruits are two chambers, each containing one seed.

Bristly mallow    Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources
Fruit sections and seeds. Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources

Seeds

Seeds are roundish and flat with a notch on one side.

More Information