背药红景天 bei yao hong jing tian

Sedum hobsonii Prain ex Raymond-Hamet, Bull. Misc. Inform. Kew 1913: 154. 1913; S. praegerianum W. W. Smith.

Caudex erect, robust. Caudex leaves leaflike, long petiolate; leaf blade oblanceolate to oblong, to 1.8 × 0.3 cm, deciduous, apex subacute. Flowering stems 5.5-13.5 cm. Stem leaves alternate, sessile, narrowly oblanceolate to oblong, ca. 10 × 2-4.5 mm, margin entire or sparsely denticulate, apex obtuse. Inflorescences helicoid cymose, 3-10-flowered. Flowers unequally 5-merous. Sepals triangular- to ovate-lanceolate, ca. 5 × 2 mm, apex acute. Petals red, ovate, to 8 × 3 mm, base connate, margin slightly fimbriate toward apex. Stamens 10; antesepalous ones ca. 7.5 mm; antepetalous ones ca. 4 mm; anthers dorsifixed. Nectar scales subspatulate-oblong, ca. 1 × 0.6 mm. Carpels ca. 5.5 mm. Styles ca. 1 mm. Follicles erect, 9-10 mm, base connate. Seeds obovoid, ca. 0.8 mm. Fl. Jul.

Forests, thickets, rock crevices; 2600-4100 m. Xizang [Bhutan, Sikkim].