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FOC | Family List | FOC Vol. 12 | Theaceae | Stewartia

13. Stewartia sinensis Rehder & E. H. Wilson in Sargent, Pl. Wilson. 2: 395. 1915.

紫茎 zi jing

Shrubs or trees, 3-11 m tall, deciduous. Current year branchlets purplish red, glabrous or villous; winter buds with 3-11 scales. Petiole purplish red, ca. 1 cm, glabrous or villous, narrowly winged; leaf blade elliptic to obovate-elliptic, 5.5-10.5 × 2.5-4.5 cm, papery, abaxially yellowish green, appressed pubescent, and densely villous along midvein, adaxially green and glabrous, secondary veins 7-11 on each side of midvein and raised on both surfaces, base broadly cuneate to rounded, margin sparsely serrate, apex abruptly acute to acuminate. Flowers solitary. Pedicel 0.5-3 cm, pubescent or glabrescent, thickened toward apex; bracteoles persistent, ovate, long ovate, ovate-lanceolate, broadly ovate, or subcordate, 2-2.5 × 1-1.3 cm, leaflike, apex abruptly acute, acuminate, or long acuminate. Sepals ovate, long ovate, ovate-lanceolate, broadly ovate, or subcordate, 1-2 × ca. 1 cm, leaflike, outside glabrous or basally sparsely pubescent, apex abruptly acute. Petals white, broadly obovate, 2.5-3 × 1.5-2 cm, outside gray sericeous, apex rounded. Stamens 1.5-2 cm; filaments basally connate, distinct parts sparsely villous. Ovary conical, tomentose; style ca. 1 cm, glabrous. Capsule conical, 1.5-2 × 1-1.5 cm, tomentose, apex rostrate; columella abortive. Seeds obovate in outline, planoconvex, 6-9 × 4-5 mm, margin narrowly winged. Fl. May-Jul, fr. Sep-Nov.

● Forests, dense thickets or scrub on mountains; 500-2200 m. Anhui, Fujian, N Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangxi, S Shaanxi, E Sichuan, NE Yunnan, Zhejiang.

1 Current year branchlets, winter buds, petioles, bracteoles, and sepals densely villous.   13d var. shensiensis
+ Current year branchlets, winter buds, petioles, bracteoles, and sepals glabrous or sparsely pubescent, soon glabrescent   (2)
2 (1) Bracteoles and sepals not leaflike, bracteoles broadly ovate to subcordate and apex obtuse, outer 2 sepals orbicular or reniform and apex rounded.   13c var. brevicalyx
+ Bracteoles and sepals leaflike, ovate, long ovate, or ovate-lanceolate, apex acute to acuminate   (3)
3 (2) Pedicel 0.5-1 cm; bracteoles and sepals ovate, apex abruptly acute.   13a var. sinensis
+ Pedicel (1.5-)2-3 cm; bracteoles and sepals long ovate to ovate-lanceolate, apex acuminate to long acuminate.   13b var. acutisepala


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