﻿174 DICOTYL. seu EXOGEN^E. betula. 



feri, novelli pilosuli mox glabri. Folia plerumque acuta, rarius obtusa, inae- 



(jualiter v. duplicato argute denlata, utrinque 5-6-nervia, juniora pilosula et 



mox glabra v. ad nervos tantum puberula, subtus laevia v. resinoso-punctata ; 



ramulorum fertilium ovata v. ovato-oblonga subrotunda v. rarissime cordato- 



ovata; ramulorum sterilium brevius petiolata, ovato-subrotunda v. basi saepe 



cordata et profundius dentata. Strobili ovato-oblongi v. cylindrici, erecti v. 



rarissime nutantes ; squamae plus minusve cuneiformes, antice trilobae; lobi 



aequales v. intermedius longior, laterales porrecti v. plus minusve divergentes, 



angusti v. intermedius latior. Samararum alae nucula 2-4-plo angustiores. — 



Variat : 



k, genuina, foliis subtus eglandulosis, strobilis breviter pedunculatis. — 



In Europa media et boreali, in turfosis subalpinis Helvetiae, Bavariae, 



Austriae, Germaniae borealis, in Suecia, Curonia, Livonia, in Rossia 



media et australi, Sibiria altaica baicalensi et orientali, Dahuria a alpi- 



bus sajanensibus, Soongoriae montibus et in provinciis Oregon et Wis- 



consin Americae borealis. B. humilis, B. fruticosa, B. oycowiensis, B. 



Socolowii et B. sibirica auct. supra citatorum. B. humilis a genuina, (i 



commutata et y Socolowii Regel monogr. p. 46 et 48. Pedicellus brevis, 



strobilo 4-pluries brevior. — Variat foliis denticulatis (B. humilis y com- 



mutata Regel 1. c.) v. subgrosse dentatis (B. humilis a genuina Regel I. 



c), strobilis ovato-oblongis v. subovatis, v. rarissime subcylindricis (B. 



humilis S Socolovii Regel monogr. p. 50), ramulis dense resinoso-glan- 



duliferis v. glandulis plus minus raris adspersis. Specimina in America 



boreali indigena ramulis sparse glanduliferis strobilisque subcylindricis 



gaudent. 



p, Ruprechtii, foliis subtus resinoso-punctatis. — In Dahuria (Socolow) 

 et in Mandshuria (Maxim. Maak.). B. humilis e Ruprechtii, Z Ruprechtfi 

 et -t\ ovalifolia Regel monogr. p. 51 et 52. t. 8. fig. 40-47, t. 9. fig. 56-67. 

 B. palustris var. Rupr. in Bull. 1. c. p. 559. B. fruticosa Ruprechtiana 

 Trautv. in Maxim. prim. fl. am. p. 254. B. reticulata et B. ovalifolia 

 Rupr. in Bull. de I'Ac. de St-Petersb. 1857. p. 561. Frutex 3-4-pedalis. 

 Folia e basi cuneata v. rotundata ovata, acuta v. rarius obtusa (B. ovali- 

 foliaRupr.), inaequaliter argute denticulata v. grosse duplicato-dentata 

 (B. reticulata Rupr.). Strobili cylindrico-oblongi v. rarius oblongo-ovati, 

 breviter pedunculati v. pedunculo longiore graciliore suffulti, erecti v. 

 nutantes. 



Y, Kamtschatica (Regel monogr. p. 49. t. 9. fig. 37-49), foliis saepissime 

 cordato-subrotundis v. rarissime rotundato-ovatis acutis subtus eglandu- 

 losis, strobilis longe pedunculatis. — In Kamtschatka et in Aleutis. Folia 

 inaequaliter v. dupliacto-dentata. Strobili oblongo^cylindrici, erecti v. 

 nutantes, pedunculo strobilum dimidium aequante suffulti; squamas cu- 

 neatae antice triloba ; lobi elliptico-oblongi, laterales erecti. Pedunculus 

 folium dimidium subaequans. 



§ 4. Dahuricse. 



Arbores sa?pissime excelsae. Samararum alae nucula duplo-pluries angustiores. 

 Strobilorum squamaa hieme deciduae; earum lobi plerumque abbreviati. 



13. B. dahhbica (Pall. fl. ross. vol. 1. p.60. t. 39. fig. A), ramulis glabris v. 

 glandulosis, foliis e basi cuneata v. rotundata ovatis acutis v. aeuminalis 

 dentatis, amentis oblongo-cylindricis. ; f In Dahuria, Mandshuria et in mon- 

 tibus albis Americae borealis. — Pall. Reise vol. 3. p. 224. 321. 421. t. K. k. 

 fig. 4 et 6; Ledeb. fl. ross. vol. 3. p. 651; Trautv/ in Bull. de la Soc. 

 des nat. de Moscou, 1857. vol. 2. p. 445. t. 7; Turcz. fi. baic. dah. vol. 2. 

 p. 128: Regel in Bull. de l'Ac. de St. Petersb. 1856. p. 490; Rupr. in 

 Bull. de l'Ac. de, St. Petersb. 1857. p. 562; Regel monogr. p. 55. 1. 10. rig. 19"- 

 40, t. 8. fig. 36-39 et fl. uss. p. 135. B. dahurica var. Maximowicziana Trautv. 

 in Max. prim. p. 250. B. Maximowiczii Rupr. in Bull. de l'Ac. de St-Petersb. 

 1856. p. 435. B. Maaki Rupr. 1. c. 1857. p. 564. Arbor cortice griseo-fusco, 

 profunde dirumpente. Ramuli erecti glabri et plerumque laxe v. rarius 



