节花蚬木Excentrodendron tonkinense
中文名（Chinese Name）：节花蚬木
学名（Scientific Name）：Excentrodendron tonkinense (A. Chev.) H. T. Chang et R. H. Miau
英文名（English Common Name）：
别名（Chinese Common Name）：蚬木
异名（Synonym）：Excentrodendron hsienmu (Chun et How) H. T. Chang et R. H. Miau Excentrodendron rhombifolium H. T. Chang et R. H. Miau Burretiodendron hsienmu Chun et F. C. How Burretiodendron tonkinense (A. Chev.) Kosterm. Burretiodendron tonkinensis
科属（Family & Genus）：椴树科（Tiliaceae）蚬木属
形态特征（Description）：常绿乔木；嫩枝及顶芽均无毛。叶革质，卵形，长14-18厘米，宽8-10厘米，先端渐尖，基部圆形，上面绿色，发亮，下面同色，脉腋有囊状腺体及毛丛，无毛，基出脉3条，两侧脉上行达叶片长度的1/2，且各有第二次分枝侧脉5-6条，离边缘1-1.2厘米，基部无明显的边脉，中脉有侧脉3-4对，全缘；叶柄长3-6厘米，圆柱形，无毛。圆锥花序或总状花序长4-5厘米，有花3-6朵；花柄有节，被星状柔毛；苞片早落；萼片长圆形，长约1厘米，外面有星状柔毛，内面无毛，基部无腺体或内侧数片每片有2个球形腺体；花瓣倒卵形，长5-6毫米，无柄；雄蕊18-35枚，长5-6毫米，花丝基部略相连，分为5组，各组雄蕊不等数，花药长3毫米；子房5室，每室有胚珠2颗，具中轴胎座，花柱5条，离生，极短。蒴果纺锤形，长3.5-4厘米；果柄有节。
分布（Distribution）：产广西，生长于石灰岩的常绿林里，是桂西石灰岩山地常绿林的主要建群种。
引自中国植物志英文版：FOC Vol. 12 Page 261, 262
Excentrodendron tonkinense (A. Chevalier) Hung T. Chang & R. H. Miao, Acta Sci. Nat. Univ. Sunyatseni. 17(3): 23. 1978.
蚬木 xian mu| Tiliaceae | Excentrodendron
Pentace tonkinensis A. Chevalier, Bull. Écon, Indochine, n.s., 20: 803. 1918; Burretiodendron hsienmu Chun & F. C. How; B. tonkinense (A. Chevalier) Kostermans; Excentrodendron hsienmu (Chun & F. C. How) Hung T. Chang & R. H. Miao; E. rhombifolium Hung T. Chang & R. H. Miao.
Trees to 40 m. Petiole 3.5-6.5(-10) cm; leaf blade green, orbicular-ovate or elliptic-ovate, 8-14(-18) × 5-8(-12) cm, leathery, glossy, abaxially yellow-brown fascicled hairy in vein axils, lateral basal veins to 1/2 as long as blade, 10-15 mm from margin, each with 4 or 5 secondary veins, base rounded, apex acuminate or caudate-acuminate. Male inflorescences paniculate, 7-13-flowered, 5-9 cm; female inflorescences racemelike, 1-3-flowered. Flowers unisexual. Pedicel not articulate. Sepals oblong-lanceolate, 1-1.5 cm, abaxially brown stellate puberulent, adaxially glabrous, without glands or a few inner petals with 2 globose glands. Petals broadly obovate to spatulate, 8-9 × 5-6 mm, base obviously clawed. Stamens 25-35; filaments 4-6 mm; anthers ca. 3 mm. Female flowers unknown. Capsule
ellipsoid, 2-3 cm.
Evergreen forests on limestone. Guangxi, SE Yunnan [Vietnam].
Excentrodendron tonkinense (as Burretiodendron hsienmu) is included in the IUCN Red List as "Vulnerable (B1+2c)." The wood is very hard and is prized for making chopping boards.
（责任编辑：徐晔春）
学名（Scientific Name）：Excentrodendron tonkinense (A. Chev.) H. T. Chang et R. H. Miau
英文名（English Common Name）：
别名（Chinese Common Name）：蚬木
异名（Synonym）：Excentrodendron hsienmu (Chun et How) H. T. Chang et R. H. Miau Excentrodendron rhombifolium H. T. Chang et R. H. Miau Burretiodendron hsienmu Chun et F. C. How Burretiodendron tonkinense (A. Chev.) Kosterm. Burretiodendron tonkinensis
科属（Family & Genus）：椴树科（Tiliaceae）蚬木属
形态特征（Description）：常绿乔木；嫩枝及顶芽均无毛。叶革质，卵形，长14-18厘米，宽8-10厘米，先端渐尖，基部圆形，上面绿色，发亮，下面同色，脉腋有囊状腺体及毛丛，无毛，基出脉3条，两侧脉上行达叶片长度的1/2，且各有第二次分枝侧脉5-6条，离边缘1-1.2厘米，基部无明显的边脉，中脉有侧脉3-4对，全缘；叶柄长3-6厘米，圆柱形，无毛。圆锥花序或总状花序长4-5厘米，有花3-6朵；花柄有节，被星状柔毛；苞片早落；萼片长圆形，长约1厘米，外面有星状柔毛，内面无毛，基部无腺体或内侧数片每片有2个球形腺体；花瓣倒卵形，长5-6毫米，无柄；雄蕊18-35枚，长5-6毫米，花丝基部略相连，分为5组，各组雄蕊不等数，花药长3毫米；子房5室，每室有胚珠2颗，具中轴胎座，花柱5条，离生，极短。蒴果纺锤形，长3.5-4厘米；果柄有节。
分布（Distribution）：产广西，生长于石灰岩的常绿林里，是桂西石灰岩山地常绿林的主要建群种。
引自中国植物志英文版：FOC Vol. 12 Page 261, 262
Excentrodendron tonkinense (A. Chevalier) Hung T. Chang & R. H. Miao, Acta Sci. Nat. Univ. Sunyatseni. 17(3): 23. 1978.
蚬木 xian mu| Tiliaceae | Excentrodendron
Pentace tonkinensis A. Chevalier, Bull. Écon, Indochine, n.s., 20: 803. 1918; Burretiodendron hsienmu Chun & F. C. How; B. tonkinense (A. Chevalier) Kostermans; Excentrodendron hsienmu (Chun & F. C. How) Hung T. Chang & R. H. Miao; E. rhombifolium Hung T. Chang & R. H. Miao.
Trees to 40 m. Petiole 3.5-6.5(-10) cm; leaf blade green, orbicular-ovate or elliptic-ovate, 8-14(-18) × 5-8(-12) cm, leathery, glossy, abaxially yellow-brown fascicled hairy in vein axils, lateral basal veins to 1/2 as long as blade, 10-15 mm from margin, each with 4 or 5 secondary veins, base rounded, apex acuminate or caudate-acuminate. Male inflorescences paniculate, 7-13-flowered, 5-9 cm; female inflorescences racemelike, 1-3-flowered. Flowers unisexual. Pedicel not articulate. Sepals oblong-lanceolate, 1-1.5 cm, abaxially brown stellate puberulent, adaxially glabrous, without glands or a few inner petals with 2 globose glands. Petals broadly obovate to spatulate, 8-9 × 5-6 mm, base obviously clawed. Stamens 25-35; filaments 4-6 mm; anthers ca. 3 mm. Female flowers unknown. Capsule
ellipsoid, 2-3 cm.
Evergreen forests on limestone. Guangxi, SE Yunnan [Vietnam].
Excentrodendron tonkinense (as Burretiodendron hsienmu) is included in the IUCN Red List as "Vulnerable (B1+2c)." The wood is very hard and is prized for making chopping boards.
（责任编辑：徐晔春）
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