BETULACEAE. — BETULA 481 



For further literature see Herder, 1. c. 



NORTHEASTERN ASIA. Kamtchatka; Saghalien ? (see Herder, 1. c). 

 I have not seen any specimen of this plant from our area, but 1 do not doubt that 

 it occurs in the Arctic regions of eastern Asia. 



Subsect. b. Fruticosae Schneider, n. comb. 



Betula, sect. Fruticosae Regel in Bull. Soc. Nat. Mosc. XXVllI, pt. 2, 406 



(pro parte) (1865). 

 Betula, sect. Eubetula, subsect. Fruticosae Regel in De Candolle, Prodr. XVI. 



2, 162 (186S). 

 Betula, subgen. Fruticosae, Nakai in Tohjo Bot. Mag. XXIX. 40 (1915). 



21. Betula glandulosa Michaux, var. sibirica Schneider, n. comb. 

 Betula nana Ledebour, Fl. Alt. IV. 246 (excl. sjti.) (183-3). 

 Betula rotundifolia Spach in Ann. Sci. Nat. scr. 2, XV. 194 (1841). 



Betula nana, var. sibirica Ledebour, Fl. Ro.%s. 111. pt. 2, 654 (1850). — 



Regel in Noiw. Mem. Soc. Nat. Mosc. Xlll. 101, t. 9, fig. 9-12, 14-18 



{Monog. Betulac.) (1881). 

 Chamachetula rotundifolia Opiz in Lotos Jahrb. Nat. V. 259 (1855). 

 Betula glandulosa, var. rotundifolia Regel in Bull. Soc. Nat. Mosc. XXXVIIl. 



pt. 2, 408 (1865); in De Candolle, Prodr. XVI. pt. 2, 172 (1868).— 



Herder in Act. Hort. Petrop. XII. 64 (1892). 

 ? Betula htimilis, var. kamtschatica Regel in Nouv. Mem. Soc. Nat. Mosc. XIII. 



pt. 2, 107, t. 9, fig. 37-43 {Monog. Betulac. 49) (1861); Bull. Soc. Nat. Mosc. 



XXXVIIl. pt. 2, 410 (1865); in De Candolle, Prodr. XVI. pt. 2, 174 



(1868). —Winkler in Engler, Pjlanzenr. IV.-61, 74 (1904). 

 Betula glandtdosa Winkler in Engler, Pjlanzenr. IV.-61, 73 (non Michaux) 



(1904), quoad specimina asiat. 



NORTHEASTERN ASIA. Kamtchatka; Saghalien? (see Herder, 1. c.). 



I have seen only specimens from the Altai and one poor specimen collected by 

 Stewart in Kamtchatka; of this last one branch looks very much like B. humilis 

 Schrank. These forms require a careful investigation of as much and as rich mate- 

 rial as possible, for we are far from having sufficiently interpreted all the forms of 

 this group from Asia, Europe and North America. 



22. Betula Middendorffii Trautvetter & Meyer in Middendorff, Reise Sibir. I. 

 pt. 2, Bot. abt. 2, 84, t. 21 {Fl. Ochot.) (1856). — Trautvetter in Mem. Sav. Etr. 

 Acad. Sci. St. Petersbourg, IX. 255 (Maximowicz, Prim. Fl. Amur.) (1859). — Regel 

 in Nouv. Mem. Soc. Nat. Mosc. XIII. pt. 2, 98, t. 8, fig. 13-27 {Monog. Betulac. 

 40) (1861); in Bidl. Soc. Nat. Mosc. XXXVIIl. pt. 2, 406 (1865); in De Can- 

 dolle, Prodr. XVI. pt. 2, 170 (1868). — Dippel, Handb. Laubholzk. II. 169, fig. 

 80 (1892). — Herder in Act. Hort. Petrov. XII. 60 (1892). — Koehne, Deutsche 

 Dendr. Ill (1893). — Komarov in Act. Hort. Petrop. XXII. 53 {Fl. Mansh. II.) 

 (1903). — Schneider, HI. Handb. Laubholzk. I. 105, fig. 59 q-qS 64 n-p (1904). — 

 Winkler in Engler, Pjlanzenr. IV.-61, 87 (1904). 



Betula rotundifolia Regel & Tiling in Nouv. Mem. Soc. Nat. Mosc. XI. 118 {Fl. 

 Ajan.) (non Spach) (1858). 



NORTHEASTERN ASIA. Maritime Pro v. : " Insula Schantar magna," 

 August 6-7, 1844, A. T. von Middendorff {type, ex Trautvetter & Meyer); for 

 further specimens see Herder (I. c). Amur: without precise locality, C. Maxi- 

 mowicz (fruits). 



A doubtful species, of which I have not seen the type. Trautvetter, 1. c, and 



