BETULACEAE. — BETXJLA 457 



Betula utilis D. Don, var. Prattii Burkill in Jour, Linn, Soc. XXVI. 

 499 (1899).— Winkler in Engler, Pflanzenr. IV.-61, 61 (1904). 

 Henry in Elwes & Henry, Trees Gr. Brit. & Irel IV. 981 (1909). 



Western Szech'uan: west of Tachien-lu, Cheto-shan, alt. 3000- 

 4000 m., September 1908 (No, 976; tree 8-20 m. tall, girth 1.5-3 m., 

 bark dull orange; ripe fruits); same locality, alt. 3300 ni., July 24, 

 1908 (No. 976^; tree 20 m. tall, girth 2.4 m.; unripe fruit and bark); 

 same locality, alt. 3300-4000 m., September 1910 (No. 4089; tree 

 10-20 m. tall, girth 1.2-2.4 m.; fruits); southeast of Tachien-lu, alt. 

 3000-3600 m., woodlands, September 1908 (No. 990; tree 10-17 m. 

 tall, girth 1.8-2.4 m., bark gray; fruits); same locality, alt. 2600- 

 3300 m., forests, October 1910 (No. 4087; tree 7-26 m. tall, girth 

 0.6-3 m., bark dull orange red; fruits and bark); summit of Wa-shan, 

 alt. 3600 m., September and October 1908 (No. 1138; tree 10-13 m. 

 tall, girth 1.5-2.1 m.; fruits and sterile); west of Kuan Hsien, wood- 

 lands Pan-lan-shan, alt. 3000-3300 ra., September 1910 (No. 4035; 

 tree 10-20 m. tall, girth 1.2-2.7 m.; fruits); without exact locality, 

 forests, alt. 3300-4000 m., June 1904 (Veitch Exped. No. 4492; tree 

 7 m. tall; flowers); alt. 3300-4000 m., July 1903 (Veitch Exped. No. 

 4492^; tree 5-13 m. tall; fruits); forests, alt. 2300-3200 m., September 

 1904 (Veitch Exped. No, 4495; tree 7-20 m. tall; fruits); woods, 

 2000 m.. May 1904 (Veitch Exped. No. 4496; tree 8 m. tall; old fruits) ; 

 forests, 2300-3300 m., May 1904 (Veitch Exped. No. 4530; tree 10-13 

 m. tall; flowers); near Tachien-lu, 13500 feet, A, E, Pratt (No. 236; 

 co-type of var. Prattii; fruits). 



This variety resembles much more the typical B. utilis Don than the following 

 species, which was referred to B. utilis by Burkill. There are young plants in the 

 Arnold Arboretum raised from seed of Wilson's No. 4035, 4087 and 40S9. These 

 plants are very much like those of Wilson's No. 900 and 4106 and Purdora's No. 

 400 placed under B. alho-sinensis Burkill. We know, however, too little of the 

 behavior of the young plants to draw any conclusions from them. 



This species is abundant in mixed forests on the high mountains of extreme 

 western Szech'uan between 2600 and 4000 m. altitude. It grows from 25 to 30 m. 

 tall with a trunk from 2.5 to 3 m. in girth; the bark is rough and rather shaggy and 

 varies in color from orange-brown to orange-gray or even to pale gray on old trees 

 in much exposed situations. E. H. W. 



Diels in BoL Jahrb. XXIX. 282 (1900). 



XXVI 



Beiula utilis Burkill in Jmir. Unn. Soc. XXVI. 499 (pro parte, non D. Don) 

 (1899). — Diels in Bot. Jahrb. XXIX. 282 (1900). — Winkler in Engler, 

 PflanzeuT. IV .-61, 61 (1904), quoad specim. Chinensia. 



Betula Bhojpattra, var. sinensis Franchet in Jour, de Bot, XIII. 207 (1899). 



