灰背老鹳草 hui bei lao guan cao

Perennials. Rootstock ± vertical, 0.7-1.7 cm in diam., not tuberculate, with a fascicle of long thickened roots. Stem 25-86 cm tall, erect, not rooting at nodes, with 0.3-0.9 mm patent or rarely retrorse and appressed nonglandular trichomes. Stipules lanceolate, distinct or connate at least at base. Leaves opposite; petiole with usually 0.2-0.9 mm patent nonglandular trichomes; leaf blade 3.7-8.1 cm, palmately cleft, ratio of main sinus/middle segment length = 0.7-0.81(-0.84), pilose with appressed nonglandular trichomes; segments 5, rhombic, 6-13(-19.1) mm wide at base, 7-10-lobed in distal half, ratio of second sinus/middle segment length = (0.13-)0.2-0.24(-0.25). Cymules solitary, 2-flowered; peduncle 4.3-12.3 cm. Pedicel 2-6.2 cm, with 0.2-0.6 mm patent or retrorse ± appressed nonglandular trichomes; bracteoles lanceolate. Sepals (0.8-)0.9-1.1 cm, mucro 1.1-3.9 mm, ratio of mucro/sepal length = 0.1-0.3, with 0.1-0.3 mm antrorse ± appressed nonglandular trichomes and 0.2-1 mm ± patent nonglandular trichomes on abaxial side, glabrous adaxially. Petals 1.6-2.1 cm, erect to patent, entire, adaxial base with trichomes, margin basally ciliate, deep purplish magenta. Staminal filaments pinkish, lanceolate, base slightly dilated, abaxially densely pilose and proximal half ciliate, trichomes 0.6-1.5 mm; anthers bluish, 1.6-2.6 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma deep red to pink. Fruit 3-3.4 cm, erect when immature; mericarps smooth, with a basal callus, with 0.3-0.7 mm ± patent nonglandular trichomes and apically usually with 0.6-1 mm patent glandular trichomes; rostrum 2.1-2.5 cm, with a 3-4.8 mm narrowed apex; stigmatic remains 5-6.9 mm. Seeds 2-2.5 mm. Fl. Jul-Aug, fr. Aug-Sep. 2n = 28, 56.

Forests, meadows; 1800-3400 m. Hebei, Heilongjiang, Henan, Jilin, Liaoning, Nei Mongol, Shandong, Shanxi [Korea, Mongolia, Russia (Baikal to Far East)].

Geranium wlassovianum and G. maximowiczii share shallowly divided leaves, paler on the abaxial side. Both species are difficult to differentiate, and the main characters are referred to in the key. Additionally, in G. wlassovianum, the anthers, gynoecium, fruit, and staminal filaments are longer (and with a dense tuft of trichomes). Trichomes on the stem and inflorescence are also longer and usually patent.