BETULACEAE. — BETULA 481 



For further literature see Herder, 1. c. 



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

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

 it ocicurs in the Arctic regions of eastern Asia. 



Subsect. b. Fruticosae Schneider, n. comb. 



Betulay sect. Fruticosae Regel in Bull. Soc, Nat. Mosc. XXVUl, pt. 2, 406 



(pro parte) (1865). 

 Betula, sect. Euhetula, subsect. Fruticosae Kegel in De Candolle, Prodr. XVI. 



2, 162 (1868). 

 Betula, subgen. Fruticosae, Nakai in Tokyo Bat. Mag. XXIX. 40 (1915). 



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

 Betula nana Ledebour, FL Alt. IV. 246 (excl. syn.) (1833). 

 Betula rotundifolia Spach in Ann. Sci. Nat. s6r. 2, XV. 194 (1841). 



Betula nana, var, sibirica Ledebour, Fl. Ross. HI. pt. 2, 654 (1850). — 



Hegel in Nouv, Mem. Soc, Nat. Mosc. XIll. 101, t. 9, fig. 9-12, 14-18 



{Monog. Betulac.) (1861). 

 Chamaehetula rotundifolia Opiz in Lotos Jahrh. Nat. V. 259 (1855). 

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



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



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

 f Betula humilis, 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. 



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



(1868). —Winkler in Englcr, Pflanzenr. IV .-61, 74 (1904). 

 Betula glandulosa Winkler in Engler, Pflanzenr. IV.-61, 73 (non Miehaux) 



(1904), quoad specimina asiat. 



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



1 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 Middendorfiii Trautvetter & Meyer in Middendorff, Reise Sihir. I. 

 pt. 2, Hot. abt. 2, 84, t. 21 (Fl. Ochot.) (1856). — Trautvetter in Mhn, Sav. £'lr. 

 Acad. Sci. St. Petershourg, IX. 255 (Maximowicz, Prim. Fl. Amur.) (1859). — Rcgel 

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

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

 dolle, Prodr. XVI. pt. 2, 170 (1868). — Dippel, Handb. Laubhohk. 11. 169, fig. 

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

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

 (1903). — Schneider, III Handb. Laubhohk, 1. 105, fig. 59 q-q*, 64 n-p (1904). — 

 Winkler in Engler, Pflanzenr. 1V.-61, 87 (1904). 



Betula rotundifolia Regel & Tiling in Nouv. Mem. Soc. Nat. Mosc. XI. 118 (FL 

 Ajan.) (non Spach) (1858). 



NORTHEASTERN ASIA. Maritime Prov.: " Insula Schantar magna," 

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

 further specimens see Herder (1. c.). Amur: without precise locality, C. Maxi- 

 rnowicz (fruits). 



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



