subspec_ rhombifolia (Kegel) Sukacz. in herb. (1916). Betiila alba subspecies 

 pubescens e rhombifolia Regel in DC. Prodrom. XVI, 2 (1868) p. 167; Herder, PI. 

 Radd. (1892) p. 53. 



Specimens of this one taken by me, with nearly ripe fruits, in the middle of July, 

 in the subalpine wood regions between Kalna and Ust Algiac, where, in places, rather 

 common. Occurring, moreover, rather frequently in the Urjankai country. 



Distribution: Eastern Europe, Siberia, northern Mongoha. 



Alnus fruticosa Rupr. Fl. Samojed. Cisur. (1845) no. 249; Kpwji. <l)ji. Ajit. V (1909) 

 p. 1252. Alnaster fruiicosus Ledeb. Fl. Ross. Ill, p. 655. Alnus alnobetula (Ehrh.) Hartig 

 var. fruticosa (Rupr.) Winkler, Betulac. in Engl. Pflanzenr. H. 19 (IV, 61, 1904) p. 106. 

 Alnasler viridis Turczan. Fl. Baical.-Dahur. (1854, II) p. 404, no. 1062. Betula viridis 

 Turczan. Cat. Baical. no. 1059. Alnus viridis var. sibirica Regel, Monogr. Betulac. (1861) 

 p. 79 Herder, PL Radd. (1892) p. 69. 



Scattered in the Amyl valley and between Kalna and Ust Algiac, especially along 

 river-banks, where gathered by me in flower about the middle of July. Rather frequent 

 in the Urjankai country; on the rivers Sisti-kem, Bei-kem, Kamsara, and Tara-kem. In 

 the Altaian, on the mountains, it ascends to 16 — 1700 m. above sea-level. 



Distribution: North-eastern Russia, Siberia, northwards to about 72K'° north lati- 

 tude, northern Mongolia, eastern Asia, Sakhalin, Japan, North America. 



subspec. montana nov. subspec. [Tab. VII, Fig. 1]. 



A forma typica humililate differens, 1-1,5 mm. alia, foliis parvulis, 2-3,5 cm. longis, 

 1,3-2 cm. latis, ovalis vel oblonge ovatis, acuminatis, basi rotundatis, vel leviter cordatis, 

 distincte duplicato-serratis, dentibus densis, tenuibus, acuiis. Folia glaberrima, subtus 

 dilute viridia, et nervus medius - sicut axillae nervorum - semper omnino glaber, nun- 

 quam barbulalus, sed fere plus minus glandulosus. Petioli 0,2 cm. longi, subtomentosi 

 et glandulosi. Inflorescentia fructiferae tempore florescendi parvae, ovoideae vel subglo- 

 bosae, ^f-8 mm. fere 5-6 mm. longae 3,5-6, fere 4 mm. latae. Pedunculi 0,5-1 cm. longi, 

 dense puberuli et glandulosi. Squamae fructiferae 1,5-2 mm. longae, nuculae stigmatibus 

 longioribus, circa 2 mm. longis, nuculas aequantibus. Nucula ala membranacea cincta. 



This subspecies, found by me in the Altaian, about the limit of tree vegetation, is 

 distinguished by being a low shrub, not exceeding a man's height, with much curved 

 branches, and short, smooth year's shoots, only a few cm. long. The leaves are small, 

 ovate, pointed at the summit, and at the base broadly rounded or slightly cordate, length 

 from 2,5 to 3 cm., and breadth towards 2 cm. The leaves are always markedly incised- 

 serrulate, with fine, acute teeth and are, moreover, distinguished by the midrib being 

 completely smooth underneath and by the absence of tufts of hairs in the angles be- 

 tween the veins dn the under sides of the leaves, which are, like the petioles, pedunc- 

 les, and the year's shoot on the whole, more or less densely glandular-hairy. The leaves 

 are always of a pale green and dull colour underneath, bright and glabrous above. 

 Female catkins small, only half the sixe of those of the typical species, generally from 



199 



