— 188 — 



X— «-#&'& Hifli MUM- ^^g'&^vr ?, £?tf-T:5-fr 

 A^3fft£L Ml7 Mmi>ig->»=--£r 3> 



Populus sect. Trepidae Nakai, comb. nov. 



Syn. Populus sect. Leuce Duby, 1. c. pro parte— Reichenbach, 1. c. 

 pro parte— Koch, 1. c. pro parte— Spach, 1. c. pro parte— Trautvetter, 

 1. c. pro parte— Grenier & Godron, 1. c. pro parte— Wesm^l, 1. c. 

 pro parte — Lange, I.e. pro parte— Koch, I.e. pro parte — Lauche, I.e. 

 pro parte — Dippel, 1. c. pro parte— Kcehne, 1. c. pro parte— Rouy, 1. c. 

 pro parte— Schneider, 1. c. pro parte. 



Populus subgn. Leuce sect. Trepidce Dode in Mem. Soc. Hist. Nat. 

 Autun XVIII, p. 19 (1905)— Ascherson & Gr^ebner, Syn. IV, p. 24 

 (1908). 



Populus sect. Leuce subsect. Trepidce Schneider, 1. c. p. 29. 



Gemma? juveniles saepe pilosellse demum glabrescentes viscosae 

 squamis 4-6. Rami juveniles pubescentes vel glabri. Petioli laterali 

 compressi. Stamina 8-10. 



Species 7 in Europa, Asia et America bor. indigense, quarum duaa in 

 Korea spontanea?. 



(Petioli 4-9 cm. longi. Lamina foliorum 7-14 cm. longa 6-15 cm. 



j lata grosse subincurvato-serr ata P. jessoensis 



Petioli 1-4 cm. longi. Lamina foliorum 2,5-6 cm. longa 1,5-5,5 cm. 

 lata crenato-dentata P. Davidiana 



33. Populus jesoensis Nakai. 

 (Tabula nostra XLVI.) 



Populus jesoensis Nakai in Tokyo Bot. Mag. XXXIII, p. 197 (1919)— 

 Miyabe & Kudo, Icon. Essent. Forest Fl. Hokkaido, facs. IV, p. 44 

 in nota sub P. Sieboldii (1921)— Makino & Nemoto, Fl. Jap. p. 1119 

 (1925). 



Arborea 6-7 metralis alta ambitu ellipsoidea. Cortex cinereus. 





