Geranium robertianum L.
Herb Robert, Robert Geranium, Red Robin, Herb-Robert
Herb robert is a native Europe, Asia, and north Africa. It may be native to North America as well.
Identification: Forking stems (a) are up to 10" (25 cm) long. Leaves are triangular in shape and deeply divided, like those of ferns. Grown in bright sunlight, stems and leaves may be bright red, or red-tinged. Small, attractive pink flowers have five rounded petals (c) that ¼-⅜" (7-10 mm) long; flowers are ⅜-¾" (1-2 cm) in diameter. Fruits are small capsules (f); seeds (g) are brown, ¹/₁₆" (2 mm) long. Fruit capsules of this plant (e), like many other cranesbills, grow a spring-loaded beak-shaped column that triggers suddenly, spreading the seeds. The crushed leaves produce an odor similar to that of burning tires, which is sometimes used as an insect repellent. For this reason it is sometimes called “Stinky Bob.”
Medical: Herb robert has been used to treat nosebleeds and toothaches.
Geranium robertianum at the Washington State Noxious Weed Control Board (PDF)
Geranium robertianum in Paghat's Garden
Geranium robertianum at Oregon State University
Geranium robertianum on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Geranium robertianum on Ontario Wildflowers
Geranium robertianum on the Connecticut Botanical Society's Connecticut wildflowers site
Geranium robertianum on CalPhotos
Geranium robertianum description by Thomas H. Kent, last updated 2 Jan 2019.