12. Stewartia calcicola T. L. Ming & J. Li, Acta Phytotax. Sin. 34: 63. 1996.
云南紫茎 yun nan zi jing
Hartia yunnanensis Hu, Bull. Fan Mem. Inst. Biol., Bot. 6: 169. 1935, not Stewartia yunnanensis Hung T. Chang (1982).
Trees 8-15 m tall, evergreen. Young branches glabrous; current year branchlets purplish brown, gray pubescent. Petiole 1-1.5 cm, appressed pubescent, wings 2-3 mm wide; leaf blade oblong-elliptic, 8-16 × 3.5-6.3 cm, papery to thinly leathery, abaxially pale green, sparsely pubescent, and villous along midvein, adaxially dark green and pubescent along midvein, secondary veins 9-12 on each side of midvein, secondary and reticulate veins raised on both surfaces, base broadly cuneate to rounded, margin serrate, apex abruptly acute to shortly acuminate. Flowers solitary. Pedicel 3-5 mm, appressed pubescent; bracteoles 2, caducous, lanceolate, 3-4 mm. Sepals orbicular, 4-6 mm in diam., outside gray sericeous, inside puberulent, margin glandular serrate and ciliolate, apex rounded. Petals white, obovate, ca. 11 × 8 mm, outside gray sericeous. Stamens numerous; filaments basally connate. Ovary conic, glabrous. Capsule conic, 1.5-2 × ca. 1 cm; columella ca. 7 mm, apically abortive. Seeds 4-6 × 3-4 mm, narrowly winged. Fl. May-Jun, fr. Oct-Dec.
● Forests; 900-1700 m. SW Guangxi, SE Yunnan.