31 



f. horixontalis Sim. Louis, Preisverz. Herbst 1902—03. — Rami horizontaliter 



f. pyramidalis Hort., Dippel, Handb. Laubholzk. II. f 1 8 9 2 ) U0. — C. betulus 

 fashgiata Hort. — C. columnaris Hort., Spaeth 1 891 . — Arbor habitu pyramidali. 



f. cueullata Hort., H. Winkl. — C. betulus fastigiata cucullata Hort. — C. betulus 

 pyramidalis bullata Hort. — Arbor habitu pyramidali foliis cucullatis. 



f. purpurea Hort., Dippel 1. c. — Folia juvenilia rubiginosa vel rubiginoso-viridia. 



f. variegata Hort., Dippel 1. c. — C. betulus foliis variegatis Hort. — C. betulus 

 albo-variegata Hort. — C. betulus aitreo-variegata Hort. - C. betulus albo-marmorata 

 Hort. — C. betulus punctata Hort. — Folia inconstanter albo- vel aureo-variegata. 



4. C. caxoliniana Walt. Fl. carolin. ( l 788) 236; A. DC. in Prodr. XVI. 2. (1864) 

 <26; Dippel, Handb. Laubholzk. U. (1892) 141. — C. betulus L. Spec. pi. (1753) 998 

 p. p.; Koehne, Deutsche DendroL (1893) 1 16 p. p. — C. virginiana Michx. f. Hist. d. 

 arb. forest, de l'Amer. sept. III. (1813) 8, non Mill. — C. americana Michx. FI. bor. 

 amer. II. (1803) 201; Willd. Spec. pi. IV. (1805) 468; Ait. Hort. kew. ed. 2. V. (1813) 

 301; Wats. Dendrol. brit. II. (1825) 157; Guimpel, Otto et Hayne, Abbild. fremd. 

 Holzart. (1 825) f. 84; Torrey, Fl. New York II. (1843) 1 85 t. 103; Emers. Tr. and shr. 

 of Massach. 2. Ausg. (1875) 198 et t.; Michx. N.-Am. Sylva III. (1859) 28 t. 108. — 

 C. ostryoides Raf. Med. Rep. (181 1) 333. — Arbor usque o-metralis ramulis juvenilibus 

 subglabrescentibus saepius pilosis vel tomentosis. Folia ovata ovato-elliptica vel oblonga 

 acuta vel acuminata basi rotundata rarissime subcordata interdum inaequalia duplicato- 



subtus cum nervo medio adpresse pilosis in axillis barbatis costata, 6— 1 0 cm^onga 

 2,3 — 4 cm lata, 8 — 16 mm longe petiolata. Inflorescentiae masculae cylindricae den- 



brevibus vel brevissimis instructae. Inflorescentiae fructiferae rhachi prophyllis bracteis- 

 que propriis glandulose albo-punctatis instructae cylindricae 5 — 7 cm longae 2,5 — 4 cm 

 diametientes ; bracteae ± trilobae 5 — 7-costatae 2—3 cm longae lobo medio triangulato 

 saepe obliquo tunc latere rectiore subintegro altero sparsim grosse-dentato lobis lateralibus 



compressiusculae 7 — 11-nervosae pubescentes apicem versus obscure resinoso-punctatae. 



Atlantisches Nordamcrika: An Fluss- und Sumpfufern von Quebec (Keller), 

 New Jersey (Ileus er), bis Florida (Nash n. 2340) und vom Atlantischen Ocean west- 

 « bis N. -.Minnesota, durch Ohio (Krebs n. 104), Wisconsin (Schuette), Jowa, Missouri 

 (Bush), O.-Nebraska, Kansas, Texas, im S. bis Mexiko (Pringle n. 8181, Olfers n. 31 4, 

 Schiede n. 19, 25, Ehrenberg n. 1290). — Findet sich auch in europaischen Garten. 



Einheim. Namen: Blue Beech, Water Beech, Hornbeam, Iron-Wood, 



Var. tropicalia Donnell Smith in Bot. Gaz. XV. (1 890) 28. — Ramuli petioli 

 foliorum nervi rhachis nuculaeque pubescentes. Bracteae fructiferae parvae oblongae 

 obtusae mucronatae latere altero vel utrinque hastatae ceterum fere integrae. 



Guatemala: (Bernoulli et Cairo, Fl. guatem. n. 2606, 2607, ex J. D. Smith 

 1. c); Depart. Alta Verapaz 4300' (J. Donnell Smith, PI. guatem. n. 1667, 4411; 

 Lehmann, PI. euatern. costaric. columb. n. 1 446. ex J. D. Smith 1. c; Pringle, 

 Plant, mex. n. 6131?). 



inkl. n. sp. — Ramuli novelli pilosi lenticellis crebris punctu- 

 ta acuta vel breviter acuminata basi cordata serraluris acuminatis 

 luplicato-serrata costis superne impressis utrinque 1 0— 1 2-costata 



longe petiolata. Inflorescentiae fructiferae ad 7 cm longae 4— 



