Geranium platyanthum Duthie

In Geranium platyanthum, the presence of glandular trichomes is almost constant along the whole plant. Geranium reinii Franchet & Savatier is a species endemic to Japan that is quite similar to G. platyanthum but with leaves slightly more divided.

Perennials. Rootstock ± horizontal, 6-11 mm in diam., not tuberculate, with thickened roots along rootstock. Stem 29-66 cm tall, erect, not rooting at nodes, with 0.6-1.5 mm patent nonglandular trichomes and usually 0.4-1 mm patent glandular trichomes. Stipules lanceolate, distinct. Leaves 1(or 2) alternate but opposite at inflorescence; petiole with 0.4-1.7 mm patent nonglandular trichomes and usually 0.5-1.2 mm patent glandular trichomes; leaf blade 4.8-13 cm, palmately cleft, ratio of main sinus/middle segment length = 0.6-0.75(-0.78), pilose with ± appressed nonglandular trichomes; segments 5, rhombic, (1-)1.7-2.3(-3.4) cm wide at base, 6-23-lobed in distal half, ratio of second sinus/middle segment length = 0.08-0.18. Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle (0-)1.6-5.4 cm. Pedicel 2.8-16.8 mm, with 0.3-1.4 mm patent to retrorse nonglandular trichomes and 0.3-1.1 mm patent glandular trichomes; bracteoles linear- lanceolate. Sepals 6.4-10.8 mm, mucro 0.4-1.6 mm, ratio of mucro/sepal length = 0.06-0.19, outside with 0.2-1.2 mm antrorse appressed nonglandular trichomes and 0.5-1.8 mm patent glandular trichomes, inside glabrous. Petals purplish or white, (1-)1.2-1.9 cm, erect to patent, outside basally with trichomes, inside glabrous, margin basally ciliate, apex rounded. Staminal filaments purplish, lanceolate, abaxially pilose and proximal half ciliate, trichomes 2-3 mm; anthers bluish, 2.3-2.9 mm. Nectaries 5, hemispheric, glabrous. Stigma greenish to dull red. Fruit 2.8-4 cm, erect when immature; mericarps smooth, with a basal callus, with 0.1-1.4 mm ± patent nonglandular trichomes and 0.6-0.9 mm patent glandular trichomes; rostrum 2.3-3.4 cm, with a 4.8-9.8 mm narrowed apex; stigmatic remains 2.1-2.6 mm. Seeds 2.6-3.2 mm. Fl. Jun-Jul, fr. Aug-Sep. 2n = 28.

S Gansu, Hebei, Heilongjiang, W Hubei, Jilin, Liaoning, Nei Mongol, Ningxia, E Qinghai, Shanxi, Sichuan [Korea, Mongolia, E Russia].

Forests, scrub, meadows; 1000-2700 m.

Geranium eriostemon Fischer ex Candolle (1824), not Poiret (1812).