《中国植物志》|| 槭树科 ACERACEAE ||穗状槭系 Ser. 6. Spicata Pax ||长尾槭 Acer caudatum Wall.

32.长尾槭（中国树木分类学）图版38
Acer caudatum Wall. Pl. As. Rar. 2: 4, t. 132. 1831, pro parte, excl. fl. masc. ＆. syn. ——A. pectinatum Wall; Fang in Contrib. Biol. Lab. Sc. Soc. China bot. ser. 11: 97. 1939.——A. acuminatum auct. non Wall. ex D. Don. Dippel, Handb. Laubh. 2: 424, f. 198. 1892; Pax in Engl, Pflanzenreich 8 (IV.163): 15. 1902.——A. papilio King in Journ. As. Soc. Bengal 65 (2): 115. 1896 ＆ Ann. Bot. Gard. Calcutta 9: 17, t. 24. 1906.
落叶乔木，高达20米。小枝粗壮，当年生枝紫色或紫绿色，近于无毛，多年生枝灰色或灰黄色，具椭圆形或长圆形皮孔。冬芽卵圆形，鳞片卵形，外侧被淡黄色短柔毛。叶薄纸质，基部心脏形或深心脏形，长8-12厘米，宽8-12稀达15厘米；常5裂，稀7裂；裂片三角卵形，先端尾状锐尖，边缘有锐尖的重锯齿，裂片间的凹缺锐尖，深达叶片长度的1/3；上面深绿色，除叶脉的基部被毛外其余部分无毛，下面淡绿色，嫩时有淡黄色短柔毛，成熟时除叶脉上有短柔毛外其余部分无毛；主脉在上面略凹下，在下面凸起，侧脉10-11对，在下面较在上面显著，小叶脉在上面不显著，在下面显著；叶柄长5-9厘米，嫩时近顶端有毛，渐老时脱落。花杂性，雄花与丙性共同株，常成密被黄色长柔毛的顶生总状圆锥 花序，长8-10厘米，总花梗长3-5厘米，叶长大后花始开放；萼片5，黄绿色，卵状披针形，长约3毫米，外侧微被短柔毛；花瓣5，淡黄色，无毛，线状长圆形或线状倒披针形，先端钝尖，长约7毫米；雄蕊8，无毛，比花瓣略长，着生于花盘中部，花药紫色，球形或长圆形，花盘微裂，无毛；子房密被黄色绒毛，在雄花中不发育，花柱长1.5毫米，2裂，柱头平展；花梗长5-8毫米，细瘦，有短柔毛。翅果淡黄褐色，常成直立总状果序；小坚果椭圆形，长8毫米，宽6毫米；翅与小坚果长2.5-2.8厘米，宽7-9毫米，张开成锐角或近于直立。花期5月，果期9月。
产我国西藏南部。生于海拔3000-4000米的山谷松杉林下疏林中。尼泊尔、锡金、不丹和印度北部也有分布。模式标本采自尼泊尔。

《Flora of China》|| Aceraceae || Acer ||长尾枫 Acer caudatum

80. Acer caudatum Wallich, Pl. Asiat. Rar. 2: 4. 1831.

长尾枫 chang wei feng

Acer caudatum var. erosum (Pax) Rehder; A. caudatum subsp. georgei (Diels) A. E. Murray; A. caudatum var. georgei Diels; A. caudatum var. multiserratum (Maximowicz) Rehder; A. caudatum subsp. prattii (Rehder) A. E. Murray; A. caudatum var. prattii Rehder; A. erosum Pax; A. multiserratum Maximowicz; A. papilio King.

Trees to 10 m tall, andromonoecious. Branchlets stout, with elliptic or oblong lenticels; winter buds ovoid, outer scales ovate. Leaves deciduous; petiole red, 5-9 cm, glabrous or pubescent; leaf blade abaxially light green, adaxially dark green, 8-12 cm wide, membranous, abaxially yellowish pilose, adaxially glabrous except pubescent on veins, base cordate or deeply cordate, 5-lobed, rarely 7-lobed; lobes ovate or triangular-ovate, margin doubly and sharply incised-serrate, with acuminate teeth, apex caudate or acuminate. Inflorescence terminal, red, compact, racemose-paniculate, villous; peduncles 8-10(-12) cm. Pedicel 5(-8) mm, slender, slightly pubescent. Sepals 5, ovate-lanceolate, ca. 3 mm. Petals 5, linear-oblong, ca. 7 mm, glabrous. Stamens 8, glabrous. Disk extrastaminal, lobed, glabrous. Ovary densely yellow tomentose; style 1-5 mm; stigmas spreading. Fruit yellowish brown; nutlets ovoid-subglobose, rarely flat, veined; wing including nutlet 2.5-2.8 cm × 7-9 mm, wings spreading acutely or erectly. Fl. May, fr. Sep. 2n = 26.

Alpine forests; 1700-4000 m. SE Gansu, W Henan, W Hubei, Ningxia, S Shaanxi, W Sichuan, SE Xizang, NW Yunnan [Bhutan, N India, Myanmar, Nepal].