Geranium koreanum Kom.

Broadly ovate stipules are a distinctive feature of this species and are also shared by Geranium shikokianum Matsumura, an endemic from Japan and Korea. However, the latter has leaf blades more deeply divided, nectaries with trichomes, and petals almost glabrous on both sides.

Perennials. Rootstock ± vertical, 0.8-1.5 cm in diam., not tuberculate, with thickened roots along rootstock. Stem 30-87 cm tall, erect, not rooting at nodes, with 0.1-1.8 mm retrorse appressed or patent nonglandular trichomes. Stipules broadly ovate, usually connate. Leaves opposite; petiole with 0.2-1.7 mm retrorse appressed or patent nonglandular trichomes; leaf blade 6.3-9.9 cm, palmately cleft, ratio of main sinus/middle segment length = 0.65-0.81, pilose with appressed nonglandular trichomes; segments 5, rhombic, 1.1-2.6 cm wide at base, 8-14-lobed in distal half, ratio of second sinus/middle segment length = (0.08-)0.13-0.15(-0.21). Cymules solitary, 2-flowered; peduncle 2.5-10.3 cm. Pedicel 1.4-3.5 cm, with 0.1-0.6 mm retrorse appressed or patent nonglandular trichomes; bracteoles lanceolate. Sepals 7.4-10.9 mm, mucro 1.3-3.8 mm, ratio of mucro/sepal length = 0.15-0.38, outside with 0.1-0.9 mm antrorse ± appressed nonglandular trichomes, inside glabrous. Petals bright pink, (1.2-)1.3-1.6(-2.1) cm, erect to patent, outside basally with trichomes, inside basal ca. third with trichomes, margin basally ciliate, apex rounded. Staminal filaments pinkish, lanceolate, base slightly dilated, almost glabrous but with scattered 0.1-0.4 mm trichomes; anthers bluish, 1.9-2.8 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma dull red. Fruit 2.7-3 cm, erect when immature; mericarps smooth, with a basal callus, with 0.2-0.4 mm ± patent nonglandular trichomes and apically rarely with 0.6-0.8 mm patent glandular trichomes; rostrum 1.7-1.8 cm, with a 2.3-3.3 mm narrowed apex; stigmatic remains 5-6.3 mm. Seeds 2.6-2.9 mm. Fl. Jul-Aug, fr. Aug-Sep. 2n = 28.

E Liaoning, NE Shandong [Korea].

Forests, meadows; 500-800 m.

Geranium lauschanense R. Knuth; G. tsingtauense Y. Yabe; G. tsingtauense f. album F. Z. Li.