1214 
Pontederia cordata L. 220. — II, 346, 
720 
— f. brasiliensis Solms 220 
hastata II, 346 
lanceolata II, 720 
ovata L. 220 
Pontederiaceae 220. — II, 346 
Ponthieva N. A. 199 
Popowia N. A. 247. — II, 359, 832 
aberrans Pierre 248 
Mesnyi Craib 248 
Populus N. A. 969. — II, 174, 176, 
196, 602, 603, 760 
sect. Aigeiros Il, 602 
sect. Leuce II, 602 
sect. Leucoides 11, 602 
sect. Turanga II, 602 
alba II, 176, 602, 604 
angulata II, 602 
— var. serotina Dippel 969 
aurea II, 777 
balsamifera II, 759, 755 
canadensis Hartig 969. — IL, 
165 
— aurea van Geerti Andre 969 
— d. aurea van Geert 969 
— b.ereceta Dippel 969 
— f. grandifolia 969 
— regenerata Hort. 969 
deltoides f. erecta Schneid. 969 
euphratica II, 602, 692, 824 
euxylon Dode 969 
grandidentata II, 760 
macrophylla II, 602 
marilandica Bosc. 969 
monilifera II, 603 
— erecta Selys-Longch. 969 
nivea II, 176 
pruinosa II, 602 
regenerata Hort. 969 
serotina Hart. 969 
— var. aurea Henry 969 
— var. erecta Henry 969 
tremula II, 41, 176, 602 
tremuloides II, 664, 759, 773 
trichocarpa II, 773 
Porana N. A. 546. — II, 433 
Poraqueiba N. A. 678 
Porphyra dichotoma Lour. 1071 
Porroglossum II, 333 
Pontederia cordata—Potamogetonaceae 
Porteranthus trifoliatus (L.) Britt. II, 
583 
ı Portlandia 934. — N. A. 952 
ı — elliptieca Britton 956 
— Ghiesbreghtiana Baill. 934 
— mexicana Hemsl. 946 
— nitens Britt. 956 
 — pendula C. Wright 957 
_ — pterosperma S. Wats. 934 
 — sessilifola Britt. 957 
| — Shaferi Standl. 957 
 — uliginosa Wernh. 956 
Portula Gilliesii Hook. II, 570 
Portulaca grandiflora II, 570 
— Jutea Sol. II, 570, 852 
— oleracea II, 824, 872 
— phaeosperma II, 872 
— quadrifida II, 570 
Portulacaceae 887. — II, 198, 570 
Possira arborescens Aubl. 779 
Potalia II, 525 
Potamogeton N. A. 220. — II, 174, 
194, 196, 347, 348, 656, 743 
— bupleuroides Fernald 220 
— coloratus II, 161 
| > emp IL 10, Sehr 
ı — decipiens Nolte II, 347 
— densus II, 161 
— Drucei Fryer II, 347 
— fluitans II, 161 
— foliosus Raf. II, 347 
— gramineus II, 161 
— gramineus X perfoliatus II, 347 
— helvetieus II, 347 
— javanicus II, 205, 348 
— Jucens II, 161 
— lucens x perfoliatus II, 347 
— Jucens x praelongus II, 347 
— natans II, 161, 169, 347 
— nitens II, 347. 
— pectinatus var. interruptus II, 161 
— perfoliatus II, 161, 347, 348 
— petiolatus Wolfg. II, 347 
— polygonifolius Pourr. II, 161, 347 
— Richardii Solms-Laub. II, 347 
— vaginatus var. helveticus Fisch. II, 
347 
— Zizi II, 161 
Potamogetonaceae 220. — 11, 212, 
347, 348 
