Hairy, perennial, rhizomatous herb, with thick rhizome or caulorrhiza and ± erect flowering stems to c. 50 cm long. Petioles of basal lvs long, usually red at base and apex; hairs directed downward. Lamina deeply palmately lobed, ± reniform, to c. 10 × 12 cm, densely hairy when young; lobes 5-7, pinnatifid to pinnatisect; ultimate segments ± acute. Cauline lvs much smaller than basal. Infl. very open, with a few pairs of fls; peduncles long; peduncles and pedicels densely covered in glandular hairs. Sepals 11-13 mm long including a short awn, densely covered in glandular hairs; margins hyaline; nerves reddish. Corolla saucer-shaped. Petals 18-24 × 12-17 mm, obovate, blue or deep blue with somewhat pinkish veins; claw very short; apex rounded. Filaments white, strongly dilated towards base; anthers blue. Ovary with glandular hairs. Ripe mericarps not seen.
Much like no. 1 [Geranium maculatum L.], the lvs generally more deeply cleft, with narrower and more sharply laciniate segments; pedicels, cal, and beak of the fr densely glandular-tomentose; peduncles usually 1-fld; pedicels deflexed after anthesis, becoming erect again at maturity; pet 15–20 mm, bright blue-violet, entire or slightly retuse; 2n=28. Native of Eurasia, occasionally escaped or adventive with us, especially northeastward. June, July.