BETULACEAE. — BETULA 467 



in the characters mentioned in the key and seems to have a different geogra])hical 

 distribution. 



Tlie oldest name for B. cylindrostachya is perhaps B. niiida D. Don {Prodr. 

 Fl. Nepal. 58 [1825]), the type of which was collected by Kamrup in SirinaRur. 

 I have not seen the type, but only a part of Wallich's No. 2795, collected by li. lilink- 

 worth in Kumaon which apparently represents the tj^pe of Lindley's B. niiida in 

 Wallich {Icon. Plant. As. Rar. II. 7 [1831]). This specimen of Blinkworth can 

 hardly be separated from B. cylindrostachya. According to Lindley B. nitida 

 is " omnino inter B. acuminatam et B. cylindrostachyam media." Spach (in 

 Arm. Sci. Nat., ser. 2, XV. 200 [1841]), describes B. nitida as Betulaster nitida, 

 and he adds, 1. c. 199, another species under the name of Betulaster ajjinis {Betula 

 affinis Endlicher, Gen. Suppl. IV. 20 [1847]), which according to his descrijition 

 seems to be only B. cylindrostachya Wallich. Regel mentions this form first as B. 

 nitida, vsLT. affinisRegel (in Nouv. Mem.Soc. Nat. Mosc. XIII. loO [Monog. Belulac. 

 72] [18Gl]),but later (in De Candolle, Prodr. XVI. pt. 2, ISO [1SG8]) he placed it 

 under the doubtful species with B. nitida D. Don. Winlclcr made the same dis- 

 position of it (in Engler, Pflanzenr. IV.-61, 95 [1904]). 



3. Betula ainoides Hamilton apud D. Don, Prodr. Fl. Nepal. 58 (1825).— 

 Hooker f., Fl. Brit. Ind. V. 599 (pro parte) (1888). — Burkill in Jour. Linn. Soc. 

 XXVI. 497 (excl. specim. Farges et var.) (1899). — Gamble,' Man. Indian Timb. 

 ed. 2, 669 (1902). — Brandis, Ind. Trees, 622 (pro parte) (1906). — Schneider, III. 

 Handb. Laubholzk. II. 882, fig. 552 g, 553 e-f (1912). 



Betula acuminata Wallich, Icon. PI. As. Rar. 7, 109 (1831). — Regel in B^dl. 



Soc. Nat. Mosc. XXXVIII. pt. 2, 418 (1865); in De Candolle, Prodr. XVI. 



pt. 2, 178 (1868). — Brandis, Forest Fl. Brit. Ind. 458, t. 46 (descript. 



tantum pro parte) (1874). — Franchet in Jour, de Bot. XIII. 207 (excl. 



specim. Fargesii et var.) (1899). 

 Betulaster acuminata Spach in Ann. Sci. Nat. ser. 2, XV. 199 (1841). 

 Betula acuminata, var. a glabra, /3 pilosa, y arguta, C lancijolia Kegel in Noxiv. 



Mem. Soc. Nat. Mosc. XIII. pt. 2, 129, 130 {Monog. Betulac. 71, 72), t. 6, fig. 



29-31, t. 13, fig. 29 (1861). 

 Betula cylindrostachys, var. /3 pilosa et y subglcbra Regel in De Candolle, Prodr. 



XVI. pt. 2, 189 (1868). 

 Betula ainoides, var. acuminata Winkler in Engler, Pflanzenr. IV.-61, 89, 



fig. 22 A-C (1904). 



CHINA. Yunnan: Mengtsze, alt. 1400 m., 1898, A. Henry (No. 11387; tree 

 10m. tall; fruits); Mengtsze, forests to southeast, alt. 1500 m., 1898, A. Henry (No. 

 10437'^; tree 13 m. tall; fruits); Mengtsze, mountain forests to southeast, alt. 

 1800 m., A. Henry (No. 10437; tree 10 m. tall; sterile); Szemao, mountains to the 

 south, alt. 1500 m., January 9, A. Henry (No. 12869; tree 10 m. tall; flowers; No. 

 12869=^; tree 7 m. tall; flowers; No. 12869'^; fruits). 



INDIA. Nepal: "insylvisad Narainhetty," F. Hamilton (ex D. Don; type of 

 B. ainoides); without locahty, N. Wallich (No. 2793; type of B. acuminata). 

 East Bengal : Mt. Sillet (Silhet), H. Bruce (ex Walhch, No. 2793 var./3, apparently 

 only in part); without locality (Herb. Griffith, No. 4486). 



1 Gamble, 1. c, mentions a Betula spec. {B. cijlindrostachys Gamble, List Trees 

 Darjcel. 79 [non Wallich] [1878]) from Sikkim, Darjeehng Hills from the Terai up 

 to 2000 m., which differs from B. ainoides in the color of bark and in the 

 anatomical characters of the wood. As the author says nothing about the leaves, 

 fruits, etc., this Birch needs further investigation. 



