BETULACEAE. — BETULA 479 



16. Betulaglobispica Shirai in Tokyo Bot. Mag. VIll. 318, t. 6, fig. 1-6 (189-1). 

 Shirasawa, Icon. Ess. For. Jap. 1. tab. 21, fig. 16-32 (1900). — Schneider, III. 

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

 1V.-61. 67, fig. 19 D-F (1904). — Rehderin Bailey, Stand. Cycl. Hori. I. 499 (1914). 



Hondo: prov. Musashi, Mt. Mitsumine in Katsiiradaira forest, October 17, 

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

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

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

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

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

 1904, TV. 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 1 saw grows on the cliffs just past the 

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

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

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



Subsect. e. Chinensss Schneider, n. subsect. 

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



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



minusve villosuli. Folia 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. 5546, 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 amcnts up to 3 cm. long. 



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

 Vlll. 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 Batalin or of B. Delavayi Franchet. 



19. Betula chinensis Maximowicz in Bull. Soc. Nat. Mosc. LIV. pt. 1, 47 

 (1879). — Burkill in Jour. Linn. Soc. XXVI. 498 (1899). — Komarov in Act. Ilort 

 Petrop. XXVI. 42 (Ft. Mansh. II.) (1903). — Winkler in Engler, Pflanzcnr. 1V.~61, 

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



