蒙椴Tilia mongolica Maxim.

别名：蒙古椴;椵树;米椴;导木-毛都;刀茂特;椴树;白皮椴;椴冠冠;裂叶椴;异木－毛都;小叶椴;

科名：椴树科 Tiliaceae

属名：椴树属 Tilia

《中国植物志》第49(1)卷062页
  12.蒙椴（东北木本植物图志）小叶椴，白皮椴，米椴
  Tilia mongolica Maxim. in Bull. Acad. Sci. Petersb. 26: 433. 1880, in Mel. Biol. 10: 585 1880;胡先骕??陈焕镛, 中国植物图谱4:30. 图版180. 1935. 东北木本植物图志419. 图版134. 图325. 1955；中国高等植物图鉴2: 792. 图3313. 1972.
  乔木，高10米，树皮淡灰色，有不规则薄片状脱落；嫩枝无毛，顶芽卵形，无毛。叶阔卵形或圆形，长4-6厘米，宽3.5-5.5厘米，先端渐尖，常出现3裂，基部微心形或斜截形，上面无毛，下面仅脉腋内有毛丛，侧脉4-5对，边缘有粗锯齿，齿尖突出；叶柄长2-3.5厘米，无毛，纤细。聚伞花序长5-8厘米，有花6-12朵，花序柄无毛；花柄长5-8毫米，纤细；苞片窄长圆形，长3.5-6厘米，宽6-10毫米，两面均无毛，上下两端钝，下半部与花序柄合生，基部有柄长约1厘米；萼片披针形，长4-5毫米，外面近无毛；花瓣长6-7毫米；退化雄蕊花瓣状，稍窄小；雄蕊与萼片等长；子房有毛，花柱秃净。果实倒卵形，长6-8毫米，被毛，有棱或有不明显的棱。花期7月。
  产于内蒙古、河北、河南、山西及江宁西部。模式标本采自内蒙古南部。

《Flora of China》 Vol. 12 (2007)
Tilia mongolica  Maximowicz
蒙椴   meng duan
Trees to 10 m. Bark grayish, exfoliating irregularly; branchlets glabrous; winter buds ovoid, glabrous. Petiole slender, 2-3.5 cm, glabrous; leaf blade broadly ovate or orbicular, 4-6 × 3.5-5.5 cm, abaxially hairy only in axils of veins, adaxially glabrous, lateral veins 4-5 pairs, base slightly cordate or obliquely truncate, margin coarsely serrate, apex acuminate, usually 3-lobed. Cymes 6-12-flowered, 5-8 cm; peduncle glabrous. Pedicel slender, 5-8 mm. Bracts on ca. 10 mm stalk, narrowly oblong, 3.5-6 × 0.6-1 cm, adnate to peduncle for 1/2 of length, both surfaces glabrous, base obtuse, apex obtuse. Sepals lanceolate, 4-5 mm, abaxially subglabrous. Petals 6-7 mm. Stamens as long as sepals; staminodes slightly smaller. Ovary hairy; style glabrous. Fruit obovoid, 5-angled or obscurely angled, 6-8 mm; exocarp thickly leathery, fragile, hairy, indehiscent. Fl. Jul. 2n = 164*.
● Hebei, Henan, W Liaoning, Nei Mongol, Shanxi.