ACERACEAE. 



Determined by Alfred Rehder. 

 DIPTERONIA Oliver. 



Dipteronia sinensis Oliver in Hooker's Icon. ^H^IX. t. 189S (1889). 



Western Hupeh: north and south of Ictiang, woodlands, alt. 

 900-1800 m., June 1907 (No. 883, in part); Chang-lo Hsien, alt. 900- 

 1800 m., September 1907 (No. 883, in part); Hsing-shan Hsien, alt. 

 900-1600 m., July 1907 (No. 883, in part); Patung Hsien, alt. 1600 m., 

 June 1907 (No. 883, in part). Western Szech'uan: Mupin, woods, 

 alt. 1200-1800 m., September 1907 (No. 883, in part). 



The fruits of the specimens from Mupin are somewhat larger and sometimes 

 3 cm., long. 



ACER L. 



Sect. PLATANOIDEA Pax. 



Acer pictum Thunberg, Fl. Jap. 162 (1784). 

 The typical form does not occur in China. 



Acer pictum, var. parviflorum C. K. Schneider, III. Handb. Lauh- 

 holzk. II. 225 (1907). 



Acer mono Maximowicz in Bull. Phys. Math. Acad. Sci. St. Petersbourg, XV. 

 126 (1857); in Mel. Biol. II. 416 (1857). 



Acer laetum, y 'parviflorum Regel in Bull. Phys. Math. Acad. Sci. St. Peters- 

 bourg, XV. 219 (1857); in Mel. Biol. II. 486 (1857). 



Acer pictum, var. mono Pax in Bot. Jahrb. VII. 236 (1886); in Engler, Pflanzen- 

 reich, Heft 8 (IV. 163), 47 (1903). — Rehder in Sargent, Trees and Shrubs, 

 I. 177 (1905). 



Western Hupeh: Fang Hsien, woods, common, alt. 1200-2300 

 m., May and September 1907 (Nos. 310, 1889?, 1905, 1915, 1919, 

 1921); Hsing-shan Hsien, woods, alt. 1500-1800 m.. May 31, 1907 

 (No. 642); Wen-tsao-shan, Hsing-shan Hsien, alt. 1800-2400 m., 

 May 1907 (Nos. 1897, 1922); Chang-yang Hsien, woodlands. May, 

 July, and September 1907 (Nos. 1923, 1926, 2049). Western 

 Szech'uan: Ta-p'ao-shan, northeast of Tachien-lu, forests, alt. 2300- 



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