﻿170 DICOTYL. sed EXOGENjE. betula. 



circiter duplo latioribus. 5 In Davuria (Pallas, Tnrczaninow), in alpibus 

 sajanensibus (Radde, Stubendorff) , in Mandshuria boreali (Maximowicz), in 

 Sibiria orientali ail fluv. Utschur (Paulio-wsky). — Koch syn. fl. germ. ed. 2. 

 p. 761. B. Gmelini Bunge enum. pl. alt. p. 113,in obs. ad B. microphyllam ; 

 Ledeb. fl. ross. vol. 3. p. 672; Turcz. fl. baic. dah. vol. 2. p. 28; Trautv. pl. 

 . imag. t. 5; Trautv. et Mey. in Midd. fl. och.-p. 84. B. humiliorpalustris amentis 

 per omnes dimensiones mino?ibus Gmel. fl. sib. vol. 1. p. 167. t. 26. fig. 2. B. 

 divaricata Ledeb. fl. ross. vol. 3. p. 652; Turcz. fl. baic. dah. vol. 2. p. 129. 

 B. fruticosa a Gmelini Regel monogr. p. 34 t. 6. fig. 39-49. Frute* 8-lG-pe- 

 dalis; ramis erectis; ramulis dense glanduliferis, novellis Miisque laxe pilo- 

 sulis et deinde glabris. Folia petiolo lamina dimidio breviore suffulta, saepis- 

 sime acuta, rarius obtusa, margine duplicato-v. inaequaliter argute dentata, 

 subtus insigniter v. rarius vix conspicue glanduloso-punctata, ad 1 | poll. longa 

 et i poll. lata. Folia lamulorum sterilium grosse-duplicato-dentata v. subinde 

 subinciso-dentata, interdum usque 2 poll. longa. Strobili breviter peduncu- 

 lati, oblongo-elliptici v. rarius oblongo-cylindrici ; pedunculi strobilo dimi- 

 dio breviores; squamae saspissime basi elongato-cuneatas, apice trilobae, 

 lobis angustis brevibus lateralibus porrectis v. subpatentibus lobo intermedio 

 saepissime brevioribus. Samararum alas nucula saepe duplo, rarius sesqui tan- 

 tum latiores. 



4. B. Middendorffii (Trautv. et Mey. in Midd. Beise fl. och. p. 81), ramulis 

 glanduliferis, foliis obovatis v. subrotundis obtusis crenato-dentatis, samara? 

 alis nuculam asquantibus usque duplo latioribus. 5 ^ n Sibiria orientali 

 boreali et australi, in regione amurensi. — Trautv. in Maxim. prim. fl. am. 

 p. 255; Regel et Tiling. fl. ajan. Nachtr. ; Regel monogr. Bet. p. 40. t. 8. 



[ fig. 13-27. B. rotundifolia Regel et Tiling fl. ajan. p. 119. Frutex 3-10-peda- 

 lis ; ramis erectis ; ramulis plus minus dense glanduliferis, novellis saspissime 

 pubescentibus, deinde glabris. Folia breviter petiolata, e basi cuneata v. 

 subcuneata obovata v. subrotunda, inaequaliter crenato-dentata, saspissime 

 rotundato-obtusa, rarius subacuta, utrinque 3-6-nervia, juniora pilosula et 

 mox glabra , subtus saspissime epunctata. Strobili oblongo-cylindrici v. ovato- 

 subglobosi, pedunculati , nutantes v. erecti; pedunculo gracili amentum 

 dimidium subaequante; squamis obovato-cuneatis, apice trilobis : lobis oblon- 

 gis v. lineari-oblongis v. latioribus, subasquilongis, lateralibus porrectis v. 

 rarius patentibus. 



a, communis (Trautv. in Maxim. prim. fl. amur. pag. 255), ramulis novellis 

 pubescentibus, foliis e basi cuneata ovato-rhomboideis v. obovatis, stro- 

 bilis oblongo-cylindricis. ^ I a regione amurensi (Maxim.) , in Sibiria 

 orientali prope Ddskoi et in insula Schandar (Middendorf) , pr. Ajan 

 (Tiling) , ad Lenam (Adams) , inter Ochotsk* et Irkutsk (Langsdorff). 

 Robustior. Petiolus parvus lamina 3-pluries brevior; lamina usque 

 1| poll. longa et 1| poll. Iata. Strobili saepissime penduli. Samararum 

 alae nucula saspissime duplo latiores. 



P, globosa (Rgl monogr. p. 41), ramulis novellis pubescentibus, foliis sub- 

 orbicularibus rotundato-obtusis v. obtusissimis, strobilis globosisv. ovatis 

 v. oblongis. 5 ' n Sibiria orientali, in insula Schantar (Middendorf), ad 

 Tongam et ad Lenam (Schangin), in Sibiria altaica (Mertens). B. Mid- 

 dendorfii var. schaniarensis Trautv. herb. Humilis. Folia suborbicularia, v. 

 ovato-subrotunda, subtus interdum glanduloso-punclata, vix f poll. longa. 

 Strobili penduli v. erecti, squamarum lobis saepe angustis. Samararum 

 alas nuculam circiter aaquantes v. ea paullo latiores. — A B. glandulosa, 

 cui haec forma proxima, solummodo samararum alis latioribus distinguitur. 

 Huc pertinent specimina sibirica, quee in monogr. Bet. nomine B. nana? y 

 intermediae enumeravi. 



y, nitida (Rgl monogr. p. 41), ramulis novellis glabris resinoso-glanduli- 

 feris mox lasvibus nitidis, foliis obovatis v. subrotundis, strobilis oblongo- 

 cylindricis. Prope Ajan legit Tiling. 



5. B.intermedia (Thom. teste Reichenb. ic. fl. germ. vol. 12. t. 624. fig. 1283), 

 ramulis demum laevibus, foliis rhomboideo-ovatis argute duplicato-dentatis, sa- 

 mararum aiis iiuculam aequantibus v. paullo latioribus. 5 In Helvetia? monti- 



