Geranium shensianum R. Knuth

This species resembles Geranium platyanthum at first sight by the leaf aspect, long trichomes of staminal filaments, and cymules partially in aggregates at the top of each branch. However, G. shensianum has reflexed and shorter petals, nectaries with trichomes, and connate stipules, which are never present in the former.

Perennials. Rootstock ± horizontal, 1-1.1 cm in diam., not tuberculate, with many fibrous roots. Stem 80-85 cm tall, erect, not rooting at nodes, with 0.3-0.4 mm patent to retrorse nonglandular trichomes. Stipules lanceolate, connate at least at base. Leaves opposite; petiole with 0.2-0.5 mm patent nonglandular trichomes and sometimes 0.8-1.1 mm patent glandular trichomes; leaf blade 9-10.9 cm, palmately cleft, ratio of main sinus/middle segment length = 0.76-0.84, pilose with appressed nonglandular trichomes; segments 5 or 7, rhombic, 1.3-2 cm wide at base, 17-21-lobed in distal half, ratio of second sinus/middle segment length = 0.05-0.18. Cymules solitary or in aggregates at apex of each branch, 2-flowered; peduncle 1.4-9.5 cm. Pedicel 1.8-2.6 cm, with 0.3-0.5 mm patent nonglandular trichomes and 0.4-1.9 mm patent glandular trichomes; bracteoles linear-lanceolate. Sepals 7.2-7.8 mm, mucro 0.4-1.5 mm, ratio of mucro/sepal length = 0.05-0.18, outside with 0.3-0.4 mm antrorse ± appressed nonglandular trichomes and 0.4-1.6 mm patent glandular trichomes, inside glabrous. Petals whitish, 7.3-8.6 mm, reflexed, both surfaces glabrous, margin basally with a dense tuft of trichomes, apex rounded. Staminal filaments reddish, lanceolate, abaxially sparsely pilose and proximal half ciliate, trichomes 2.1-2.9 mm; anthers bluish, 2.4-2.7 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma green. Fruit 2.4-2.9 cm, erect when immature; mericarps smooth, with a basal callus, with 0.5-0.7 mm ± patent nonglandular trichomes and 0.3-0.9 mm patent glandular trichomes; rostrum 1.8-2.2 cm, with a 5-6 mm narrowed apex; stigmatic remains 1.7-1.8 mm. Seeds 1.9-2 mm. Fl. Jun-Jul, fr. Jul-Aug.

Shaanxi, N Sichuan.

● Secondary forests, meadows; 1800-2800 m.

Geranium retectum Yeo.

Geranium shensianum là một loài thực vật có hoa trong họ Mỏ hạc. Loài này được R.Knuth mô tả khoa học đầu tiên năm 1930.

陕西老鹳草（学名：Geranium shensianum）为牻牛儿苗科老鹳草属的植物，为中国的特有植物。分布于中国大陆的陕西、四川、甘肃等地，生长于海拔1,800米至2,800米的地区，多生长于山地草甸及疏林下，目前尚未由人工引种栽培。