2o6 ED. SPACH. — Reuisio Betulacearum. 



inaequaliter serratis v. denticulatis , obtusis, v. acutis , v. brève 

 acnminatis , viscosis , subtùs punctulatis , pallidè v. flavo-vires- 

 centibns, ad nervos subferrugineo-puberiilis. Samarâ obovatâ, 

 V. obcordatâ, v. suborbiculari, alis locularaento subdimidio 

 angustioribus. — America septentrionalis: a Floridâ ad Canadam. 

 (V. V c. et s. sp.) 



— a: vuLGARis. — Alfius serrulatu auctorum. — Alnus car- 

 pinifolia Desfont.! Hort. Par. (olim). — Alnus marltima 

 Hortul. — Foliisovalibus, v. ellipticis, v. lanceolato-ellipticis, 

 V. lanceolato-obovatis, V. obovatis.v. oblongo-obovatis , s£e- 

 piùs obtusis V. vix acuminatis, basi cuiieatis. 



— ^ : MACROPHYLLA. — Alnus latifolia Desfont.! Car. Hort. Par. 

 éd. 3. '— Alnus macrophylla et A. ruhra Desfont. ! Hort. Par. 

 (olim). — Foliis (4-6-pollicaribus) ellipticis v. ovato-ellipticis, 

 plerùmque aciiminatis , basi rotundatis v. subcordatis. 



A. iNCANA Willd. — Guimp. et Hayn. Deutsch. Holz. tab. iSy. 

 — Betula incana Linn. Suppl. — Betula Alnus: (3 Linn. Spec. 



— Alnus alpina Borkh. — Alnus lanuginosa Gilib. — Foliis 

 argutè biserratis v. inaequaliter serratis, impnnctatis , haud 

 viscosis , suprà opacis , subtùs cano-pubescentibus v. glaucis , 

 saepissimè acutis v. acuminatis. Samarâ obcordatâ, v. obovatâ, 

 V. suborbiculari, alis superiiè ampliatis, loculamento subdimi- 

 dio angustioribus. — Europa, Sibiria, America borealis. (V. v. 

 sp. etc.) 



— a : vui.GARis. — Alnus incana auctor. — Alnus glauca 

 Mich. fil. Arb.! — Alnus undulata Pursh (ex Nuttall.). — 

 Foliis ovatis , v. ovalibus , v. ellipticis, v. rariùs obovatis, 

 subtùs plus minùsve incano-pubescentibus v. subtomentosis, 

 saepissimè acutis v. acuminatis, basi rotundatis, v. truncatis, 

 V. cuneatis, v. raro subcordatis. 



— p : GLABRESCENS. — Aluus incana ^: an^ulala Hort. Rew. éd. 2. 

 — Alnus puhescens'Vdinsç}a^'\n Flora, i83/i, P« Sao. — Foliis 

 aduîtis subtùs ad axillas nervorum barbulatis, caeterùip gla- 

 bris V. glabriusculis, glaucis, v. glauco-viridibus. 



