Excerpta Botanica. 43 



cili, plano-compresso. Flores masculi 4-8-andri. Stigmatum la- 

 cinise angustse, divaricatse. Amenta fructifera densa. Squamae 

 bracteales pilosse v. sericeo-lanatse, palmatifidse (unica specie ex- 

 cepta) . 



A. Squama bracteales integerrimce vel nonnisi apice suhincisce ; mascu' 

 lorum lanatcs; fmminearum sparse pilosce, caduc(B. Amenta fceminea 

 masculis multb graciliora. Discus jlor is foeminei cupuliformis, ova- 

 rio multb brevior. Stylus brevissimus, indivisus. Stigmata 2, flava, 

 bipartita (laciniis linearibus, <squiIongis), basi confluentia, crucis pel- 

 tatce obliquce figuram simulantia. 



POPULUS ALBA, Linn.— Eng. Bot. t. 1618. Guimp. et Hayn. 

 Deutsch. Holz. tab. 202. — Populus major, Mill. — Populus nivea, 

 Willd. Arb. Gemmis baud viscosis, junioribus ramulisque to- 

 mentosis. Foliis subtus niveo-tomentosis (ramularibus adultis 

 ssep^ glabrescentibus), supra lucidis, viridibus ; ramularibus ova- 

 tis V. ovato-oblongis, v. subrotundis, obtusis, sinuato-angulatis, v. 

 profundi crenatis, v. sinuato-dentatis, basi rotundatis v. subcor- 

 datis ; turionalibus ovatis, v. ovato-lanceolatis, v.palmati- (3- v. 5-) 

 lobis, eroso-denticulatis, basi acutis, v. rotundatis, v. cordatis. 



B. Squama bracteales omnes profunde palmatifidce, longe sericeo-pilosce. 

 Amenta fceminea sub anthesi amentis masculis haud tenuiora. Discus 



fcemineus cyathiformis, ovarium totum induens. Stylus bifurcatus. 

 Stigmata distincta, purpurea, obliqu"^ peltata, subflabelliformia, irre- 

 gulariter 3- v. 4-fida. 



a. Turionum folia palmdtinervia, scepe 3- v. o-loba. 



POPULUS CANESCENS, Smith, Eng. Bot. t. 1619.— Guimp. et 

 Hayn. Deutsch. Holz. tab. 201. — Populus alba, Willd. Arb. (mul- 

 torumque auctorum). Gemmis pulverulentis v. tomentosis, haud 

 viscosis. Foliis supra viridibus, subtiis albido- v. cinereo-tomen- 

 tosis: ramularibus ovatis V. subrotundis, obtusis, sinuato-angulatis, 

 V. profundi crenatis, basi rotundatis v. cordatis, demum glabre- 

 scentibus ; turionalibus nunc ovatis v. triangularibus plus miniisve 

 angulosis, nunc palmatis, 3- v. 5 -lobis, denticulatis, acuminatis, 

 basi (plerumque profundi) cordatis. — Perperam sane a multis cum 

 Populo albo confusa ; vix autem a sequente specific^ distinguenda. 



b. Folia nunquam palmata. 



POPULUS TREMULA, Linn.— Eng. Bot. tab. 1909.— Guimp. et 

 Hayn. Deutsch. Holz. tab. 203. — Populus villosus, Reichb. Fl. 

 Germ. Excurs. — Gemmis glabris, viscosis. Foliis ramularibus 

 suborbicularibus v. ovato- subrotundis, obtusis, v. subacuminatis, 

 sinuato- v. eroso-dentatis v. crenatis, discoloribus (suprk viridibus, 

 vix aut ne vix lucidis, subtiis viridi-glaucis) : novellis glabris v. 

 pubescentibus, adultis ssepissime glabris. Foliis turionalibus cor- 

 datis V. ovatis, V. triangularibus, acuminatis, sinuato-dentatis v. 

 crenatis : novellis utrinque velutinis, adultioribus suprk glabre- 

 scentibus, subtiis incano-tomentosis. — Folia turionum Populi ca- 



