《中国植物志》|| 槭树科 ACERACEAE ||桐状槭系 Ser. 2. Platanoidea (Pax) Pojark. ||元宝槭 Acer truncatum Bunge

5. 元宝槭（东北木本植物图志）元宝树（河北习见植物图说），平基槭（经济植物手册），五脚树（中国树木分类学），槭（许慎，说文）图版18: 2
Acer truncatum Bunge in Mem. Acad. Sc. St. Petersb. Sav. Etr. 2: 84 (Enum. Pl. Chin. Bor. 10. 1833.) 1835; Pax in Engl. Pflanzenreich 8 (IV. 163): 45. 1902, pro parte; Rehd. in Sargent, Trees ＆ Shrubs: 151, t. 76. 1905; Fang in Cont rib. Biol. Lab. Sc. Soc. China bot. ser. 11: 22. 1939.——A. laetum var. truncatum (Bunge) Regel in Bull. Phys. -Math. Acad. Sc. St. Pe.tersb. 15: 217 (in Mel. Biol. 2: 601. 1857). 1857.——A. lobelii subsp. truncatum (Bunge). Wesmael in Bull. Soc. Bot. Belg. 29: 56. 1890.——A. lobulatum Nakai in Journ. Jap. Bot. 18: 608. 1942.——A. lobulatum var. rubripes Nakai, op, cit. 609. 1942. —A. cappada,cicum subsp. truncatum (Bunge) E. Murr. Kalmia 8: 5. 1977.
落叶乔木，高8-10米。树皮灰褐色或深褐色，深纵裂。小枝无毛，当年生枝绿色，多 年生枝灰褐色，具圆形皮孔。冬芽小，卵圆形；鳞片锐尖，外侧微被短柔毛。叶纸质，长5-10厘米，宽8-12厘米，常5裂，稀7裂，基部截形稀近于心脏形；裂片三角卵形或披针形，先端锐尖或尾状锐尖，边缘全缘，长3-5厘米，宽1.5-2厘米，有时中央裂片的上段再3裂；裂片间的凹缺锐尖或钝尖，上面深绿色，无毛，下面淡绿色，嫩时脉腋被丛毛，其余部分无毛，渐老全部无毛；主脉5条，在上面显著，在下面微凸起；侧脉在上面微显著，在下面显著；叶柄长3-5厘米，稀达9厘米，无毛，稀嫩时顶端被短柔毛。花黄绿色，杂性，雄花与两性花同株，常成无毛的伞房花序，长5厘米，直径8厘米；总花梗长1-2厘米；萼片5，黄绿色，长圆形，先端钝形，长4-5毫米；花瓣5，淡黄色或淡白色，长圆倒卵形，长5-7毫米；雄蕊8，生于雄花者长2-3毫米，生于两性花者较短，着生于花盘的内缘，花药黄色，花丝无毛；花盘微裂；子房嫩时有粘性，无毛，花柱短，仅长1毫米，无毛，2裂，柱头反卷，微弯曲；花梗细瘦，长约1厘米，无毛。翅果嫩时淡绿色，成熟时淡黄色或淡褐色，常 成下垂的伞房果序；小坚果压扁状，长1.3-1.8厘米，宽1-1.2厘米；翅长圆形，两侧平行，宽8毫米，常与小坚果等长，稀稍长，张开成锐角或钝角。花期4月，果期8月。
产吉林、辽宁、内蒙古、河北、山西、山东、江苏北部（徐州以北地区）、河南、陕西、及甘肃等省区。生于海拔400-1000米的疏林中。模式标本采自北京郊区。
本种在北京附近已多栽培，是一种很好的庭园树和行道树，如在华北各省大量推广繁殖，作为行道树，不仅引种容易，而且树冠很大，具备良好蔽荫条件，不亚于近数十年中由几外国引种的法国梧桐、洋槐等树。种子含油丰富，可作工业原料，木材细密可制造各种特殊用具，并可作建筑材料。
本种在黄河流域的下游分布很广。著者认为我国古代叫做槭树，利用很广的就是本种。

《Flora of China》|| Aceraceae || Acer ||元宝枫 Acer truncatum

11. Acer truncatum Bunge, Enum. Pl. China Bor. 10. 1833.

元宝枫 yuan bao feng

Acer cappadocicum Gleditsch subsp. truncatum (Bunge) A. E. Murray; A. laetum C. A. Meyer var. truncatum (Bunge) Regel; A. lobelii Tenore subsp. truncatum (Bunge) Wesmael; A. lobulatum Nakai; A. lobulatum var. rubripes Nakai; A. pictum Thunberg subsp. truncatum (Bunge) A. E. Murray; A. pictum var. truncatum Chin S. Chang; A. platanoides Linnaeus var. truncatum (Bunge) Gams; A. truncatum var. acuminatum X. M. Liu; A. truncatum var. beipiao S. L. Tung; A. truncatum f. cordatum S. L. Tung; A. truncatum var. nudum Schwerin.

Trees 5-10 m tall, andromonoecious. Bark grayish brown or dark brown. Branchlets slender, glabrous; winter buds ovoid. Leaves deciduous; petiole 3-9 cm, glabrous, rarely puberulent at base when young; leaf blade abaxially pale green, adaxially dark green, 8-12 × 5-10 cm, papery, abaxially reticulate, glabrous, rarely with tufts of hairs at vein axils when young, adaxially glabrous, base usually truncate or rarely subcordate, usually 5-lobed, rarely 7-lobed; lobes triangular-ovate or triangular- lanceolate, 3-5 × 1.5-2 cm, margin entire, apex acuminate or caudate-acuminate. Inflorescence erect, corymbose; peduncles 1-2 cm, slender, glabrous. Pedicel ca. 1 cm, slender. Sepals 5, oblong, 4-5 mm, apex obtuse. Petals 5, oblong-obovate, 5-7 mm. Stamens 8, 2-3 mm in staminate flowers, shorter in pistillate flowers, glabrous, inserted near inner margin of disk. Disk slightly lobed. Ovary in fertile flowers compressed; style ca. 1 mm, glabrescent. Infructescence corymbose, pendulous, each with 3-10 fruit. Nutlets flat, thick, 1.3-1.8 × 1-1.2 cm, glabrous; wing greenish white, usually ca. as long as nutlets, rarely longer, parallel on both sides, wings spreading at obtuse or right angles. Fl. Apr, fr. Aug. 2n = 26.

Forests; 400-1000 m. Gansu, Hebei, Henan, Jiangsu, Jilin, Liaoning, Nei Mongol, Shaanxi, Shandong, Shanxi [Korea].

One of us (Chang) treats this as Acer pictum subsp. truncatum; however, two of us (Chen and de Jong) believe that A. pictum and A. truncatum differ in fruit, bark, and leaves, and de Jong notes that the seeds of A. truncatum are larger, with an exceptionally high percentage of fat and with hypogeous germination.