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.

Geranium rectum là một loài thực vật có hoa trong họ Mỏ hạc. Loài này được Trautv. mô tả khoa học đầu tiên năm 1860.

直立老鹳草（学名：Geranium rectum）为牻牛儿苗科老鹳草属的植物。分布于中亚以及中国大陆的新疆等地，生长于海拔1,600米至2,300米的地区，多生在山地云杉林下或河谷草地潮湿处，目前尚未由人工引种栽培。