BETULACEAE. — EETULA 473 



Ajan, H. Tiling (type of var. lanaia); Ochotsk Sea, J. Small (Herb. N. Pacif, 

 Ex])l. Exped. Wright Coll.). 



These northern forms seem to be well distinguished by the characters indicated 

 above. 



7. Betula Jacquemontii Spach in Ann. Sci. NaL sdr. 2, XV. 189 (1841).— 



Jaoquemont, Voy. VI. t. 158 (1844). — Regcl in De Candolle, Prodr. 



XVI. pt. 2, 178 (18G8). — Bean, Trees & Shrubs Brit. Isl. I. 257 (1913). 

 Betula Bhojpaltraj var. Jacquemontii Regel in Nouv. Mem. Sue. Nat. Mosc. 



XIII. pt. 2, 118, t. 6, fig. 19 {Monog. Betulac. 60) (pro parte) (ISGl); 



in Bull. Soc. NaL Mosc. XXXVIII. pt. 2, 416 (1865); in De Candolle, 



Prodr., XVI. pt. 2, 177 (Bhojpaltra) (1868). 

 f Betula alba, var. gluHnosa, lusus latifolia Regel in Nouv. Mhn. Soc. A'at. 



Mosc. XIII. 79 {Monog. Betulac. 21) (1861), quoad specim. Indiae Orient. 



f Betula Bhojpaltra, var. glandulifera Regel in Bull. Soc. Nat. Mosc. XXXVIII. 



pt. 2, 416 (1865); in De Candolle, Prodr. XVI. pt. 2, 177 {Bhojpaltra) 

 (1868). 



Betula utilis, var. Jacquemontii Henry in Elwes & Henry, Trees Gr. Brit. & 



Irel. IV. 981, t. 270, fig. 15 (1909). 



INDIA. Kumaon: "Emodo," V. Jacquemont (tj'pe, ex Spach); Chumpua, 

 3400 m., Strachey cfe Winterbottom (No. 1; flo's\'er3). United Prov.: Dehra 

 Dun, Deota, alt. 2400 m., June 9, 1912, Sulakhan Singh (No. 98). Kashmir: 

 Zanskar, ''14000 ped.," T. Thomson (young leaves); without locality, "9-11000 

 ped.," T. Thomson; Ahbad, alt. 3300 m., C. B. Clarke (No. 28928; young leaves); 

 Hazara distr., Kagan valley, alt. 2600 m., May 1910; "Tibet, prov. ILis6ra, 

 Sangu Sar, on the right side of the Tsiinger glacier," September 12, 1856, Schlagint- 

 weit (No. 6568); Rimkim, 3800 m., Strachey & Winterbottom (No. 2; fruits). 



AFGHANISTAN. Kurrum v&Wey, 1S79, J. E. T. Aitchison {No. 7ld), 



This species certainly needs further observation. I am not sure whether the 

 plants described by Henry and Bean are really the same as Spach's species, the 

 type of which 1 have not been able to examine.^ Henry and Bean refer to trees in 

 Kew Gardens obtained from Petrograd. 



By the kindness of the Keeper of the Kew Herbarium I have been able to 

 compare a dried specimen of the plant cultivated in Kew. It certainly much re- 

 sembles B. Jacquemontii, but the leaves are almost glabrous, a little more ovate 

 in shape and with relatively long petioles. The fruiting bracts show a denser and 

 shorter ciliation, and their lateral lobes are blunter and somewhat shorter com- 

 pared ^ith the middle one. The pubescence of the branchlets of even the second 

 year is very short and fine and the young branchlets are less glandular. Unfor- 

 tunately there is no record in Petrograd where the original seeds came from. 

 Young plants in the Arnold Arboretum raised from seeds sent by Mr. R. N. Parker 

 from the northeastern Himalaya look different. The plant in Kew, however, seems 

 more nearly related to B. Jacquemontii than to any other Birch I have seen from the 

 Himalayas or eastern Asia. Neither can I refer it to any North American species 

 80 far as I know them, nor to any of the numerous hybrids in cultivation. I am 



r 



* At my request Dr. Gagnepain has kindly looked at the type-specimen in the 

 herbarium of the Mus6um d'Histoire Naturelle at Paris. According to his report 

 the type of B. Jacquemontii is certainly different from Vv'allich's typos of B. 

 ohojp,jttra. Jacquemont's plant seems to represent a form without glands on the 

 leaves. In the shape of the fruiting bracts there is apparently no real difference 

 between these two species. 



