Distribution: Western Washington; Washington south to California.
Habitat: Disturbed areas such as roadsides and ditches, usually where moist, at low elevations.
Conservation Status: Not of concern
Annual; stems glabrous, erect, 5-45 cm tall, usually reddish-tinged.
Alternate along stem on petioles to 8 cm long; blades to 4 cm across, shiny, glabrous or with inconspicuous appressed hairs, 5-7 lobed, the lobes 1-2-3/4 length of leaf blade; stipules present.
In clusters of 2 on peduncles 1-3.5 cm long; peduncles antrorsely hairy; bracteoles present, to 1.5 mm; sepals 5, 4.5-6.5 mm long, usually glabrous, strongly keeled on outer surface, bristle-tipped; petals 5, pink, 5-9 mm long; stamens 10.
16-17 mm long; carpels 5, located at base of fruit, partially united, 2.5-2.8 mm long; rostrum (beak) 12-13 mm long; seeds 2-2.2 mm long, smooth, uniformly reddish.
Easily distinguished from our other Geranium species by the shiny herbage and sepals that are strongly keeled on the back and bristle-tipped.
First collected in Washington in 2006. Geranium lucidum is an invasive weed in western Oregon and it should be expected to spread in the lowlands of western Washington.