Geranium rectum Trautv.

This species is well characterized by its long and narrow petals and by its long glandular trichomes, sometimes restricted to sepals and more frequently present on all of the inflorescence.

Perennials. Rootstock ± horizontal, 6-11 mm in diam., not tuberculate, without thickened roots. Stem 22-84 cm tall, erect, not rooting at nodes, with 0.4-1.2 mm retrorse appressed nonglandular trichomes and rarely 1.8-2.6 mm patent glandular trichomes. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.3-0.8 mm retrorse appressed nonglandular trichomes and rarely 1.4-1.9 mm patent glandular trichomes; leaf blade 4.3-10.1 cm, palmately cleft, ratio of main sinus/middle segment length = 0.69-0.87, pilose with appressed nonglandular trichomes; segments 5, rhombic, 0.7-1.4 cm wide at base, 13-23-lobed in distal half, ratio of second sinus/middle segment length = 0.14-0.24. Cymules solitary, 2-flowered; peduncle 3.5-15.9 cm. Pedicel 2-4 cm, with 0.2-0.5 mm retrorse appressed or uncinate nonglandular trichomes and sometimes 0.9-1.9 mm patent glandular trichomes; bracteoles lanceolate. Sepals 5.7-8.5 mm, mucro 1.1-2.8 mm, ratio of mucro/sepal length = 0.18-0.33, outside with 0.2-0.5 mm antrorse ± appressed nonglandular trichomes and usually 1.5-3.1 mm patent glandular trichomes, inside glabrous. Petals bright rose-pink, (1.3-)1.4-1.6(-1.8) cm, erect to patent, outside usually glabrous, inside basally with trichomes, margin basally ciliate, apex emarginate with a 0.3-0.7 mm notch. Staminal filaments white, lanceolate, abaxially pilose and proximal half ciliate, trichomes 0.2-0.4 mm; anthers whitish with a blue margin, 1.4-2.1 mm. Nectaries 5, hemispheric, glabrous. Stigma pinkish. Fruit 2.8-3.1 cm, erect when immature; mericarps smooth, with a basal callus, with 0.4-0.7 mm ± appressed nonglandular trichomes; rostrum 2-2.2 cm, with a 4-4.5 mm narrowed apex; stigmatic remains 2.3-2.6 mm. Seeds 2.2-2.6 mm. Fl. Jul-Aug, fr. Aug-Sep.

Xinjiang (Tian Shan) [Kashmir, Kazakhstan, Kyrgyzstan, Pakistan].

Forests, meadows; 1400-2400 m.