BETULACEAE. — BETULA 479 



IG. Betula globispica Shirai in Tokyo Bot. Mag. VIll. 318, t. 6, fig. 1-G (189-1).— 

 Shirasawa, Icon. Ess. For. Jap. I. tab. 21, fig. 16-32 (1900). — Schneider, III. 

 Ilandb. Laubholzk. 1. 101, fig. 53 a, 54 a-a^ (1904). — Winkler in Engler, Pjlnnzenr. 

 IV.-Gl. 67, fig. 19 D-F (1904). — Rehder in Bailey, Stand. Cycl. Hort. I. 499 (1914). 



Hondo: prov. Musashi, Mt. Mitsumine in Katsuradaira forest, Octoljer 17, 

 1893, M. Shirai (fruiting type, ex Sliirai) ; Mt. Mitsumine, October 1908, M. Koyama 

 (fruits); prov. Shimotsuke, Nikko, near the tea-house in front of the Kegon 

 waterfall, April 3, 1894, M. Shirai (ex Shirai) ; descent to Kegon fall, around Lake 

 Chuzenji, on cliffs, October 20, 1914, E. H. Wilson (No. 7708; tree 15 m. tall, 

 girth 1.5 m., bark whitish in papery flakes; fruits); Lake Chuzenji, August 30, 

 1904, N. Mochizuki (fruits); same locality, August 12, 1905, J. G. Jack (fruits); 

 Mt. Akanagi, about 1700 m., July 7, 1910 (ex Herb. Sakurai; fruits). 



A species well distinguished by its broad- or orbicular-ovate, rather coarsely but 

 sharply serrated leaves and by its subglobular cones with narrowly lobed bracts. 

 It seems to be a very local species. There are living plants in the Arnold Arboretum. 



This species is said to be common on Mt. Mitsumine, but I overlooked it when 

 collecting on that mountain. The only tree I saw grows on the cliffs just past the 

 first waterfall on the way to the foot of the Kegon waterfall near Lake Chuzenji 

 in the Nikko region. This tree is about 15 m. tall with a trunk 1.5 m. in girth, and 

 the bark is nearly wliite and separates in thin loose sheets. E. H. W. 



Subsect. e. Chinenses Schneider, n. subsect. 

 Betula, subgenus Chinenses Nakai in Tokyo Bot. Mag. XXIX. 41 (1915). 



Frutices v. arbores parvae; ramuli ut videtur semper eglandulosi sed plus 

 minusve villosuh. FoHa satis parva et satis breviter petiolata. Strobili erecti, 

 elliptici; samarae anguste alatae v. fere exalatae. Cetera ut in clavi (p. 464) 

 indicata. 



17. Betula Potaninii Batalin. See p. 459. 



18. Betula Delavayi Franchet. See p. 460. 



Betula Delavayi, var. Forrestii W.W. Smith in Not. Bot. Gard. Edinburgh, 

 VIll. 332 (1915). 



Yunnan : open situations in pine forests on the eastern flank of the Lichiang 

 range, lat. 27° 10' N., alt. 3100 m.. May 1910, G. Forrest (No. 554G, type; tree 8-13 

 m. tall; ex Smith). 



I have not seen the type of this variety, which is said to differ in its larger, 

 broader, more obtuse leaves (up to 4.5 cm. long and 3 cm. broad and silky on the 

 upper surface, and in its fruiting aments up to 3 cm. long. 



Betula Delavayi, var. calcicola W. W. Smith in Not. Bot. Gard. Edinburgh, 

 VIII. 333 (1912). 



CHINA. Yunnan: in the crevices of limestone cliffs on the eastern flank of 

 the Lichiang range, lat. 27° 20' N., alt. 3400-3700 m., June 1910, G. Forrest 

 (No. 5835, type, ex Smith; dwarf shrub, 0.3-0.45 m.). 



Not having seen the type of this variety which has densely tomentose young 

 branchlets and roundish or oblong young leaves, I cannot decide whether it is a 

 variety of B. Potaninii Batahn or of B. Delavayi Franchet. 



19. Betula chinensis Maximowicz in Bidl. Soc. Nat. Mosc. LTV. pt. 1, 47 

 (1879). — Burkill in Joitr. Linn. Soc. XXVI. 498 (1899). — Komarov in Act. Hort. 

 Petrop. XXVI. 42 {Fl. Mansh. II.) (1903). — Winkler in Engler, Pflanzenr. IV.-61, 

 67, fig. 19 G-F (1904). — Nakai in Jour. Coll. Sci. Tokyo, XXXI. 202 (Fl. Kor. II.) 



