华椴Tilia chinensis Maxim.

别名：华椴树;山拐枣;叶下花;青皮椴;千层皮;椴麻;中国椴;花椴;红椴;椴树;

科名：椴树科 Tiliaceae

属名：椴树属 Tilia

《中国植物志》第49(1)卷057页
  6．华椴（中国植物图鉴）
  Tilia chinensis Maxim. in Acta Hort. Petrop. 11:83. 1890; Rehd. et Wils. in Sarg. Pl. Wils. 2:364. 1916. 胡先骕、陈焕镛, 中国植物图4:36. 图版186. 1935; 中国高等植物图鉴2:794. 图3318. 1972; 中国高等植物图鉴补编2, 377. 1983.——T. baroniana Diels Bot. Jahrb. 29:468. 1900.

《Flora of China》 Vol. 12 (2007)
Tilia chinensis  Maximowicz
华椴   hua duan
Trees to 30 m tall. Branchlets usually brown when dry, glabrous, rarely sparsely pilose or densely tomentose; winter buds big, bud scale glabrous. Petiole 3-8 cm, usually sparsely pilose; leaf blade broadly elliptic or orbicular to ovate-orbicular, (5-)7-13 × (4.5-)6-9 cm, papery, abaxially densely stellate tomentose, adaxially glabrous, basal veins 5-7, lateral veins 7-9 pairs, base usually oblique, cordate, truncate, or rounded, margin serrate, apex acuminate or shortly acuminate. Cymes 1-3-flowered, usually not exceeding bract, shorter than leaves; peduncle hairy. Bracts long band-shaped, 4-9(-12) × 1-2 cm, adnate to peduncle for 2/5-1/2 of length, abaxially hairy, adaxially glabrous, sessile or with stalk to 0.5 cm. Sepals narrowly ovate, 6-7 mm, abaxially stellate hairy, adaxially stellate tomentose or glabrous at central part, margin densely hairy. Petals 8-9 mm, glabrous. Stamens 30-45, in 5 fascicles; staminodes 5, smaller than petals. Ovary 5-angled, gray-yellow tomentose; style glabrous; stigma peltate or capitate. Fruit ellipsoid or globose, prominently 5-angled, 10-14 × 8-9 mm, gray-yellow tomentose; exocarp woody, hard, indehiscent. Fl. Jun-Jul, fr. Aug-Oct. 2n = 164*.
● Forests; 1800-3100(-3900) m. Gansu, Henan, Hubei, Shaanxi, Sichuan, Xizang, Yunnan.