sericea, 1637 

 Plumbaginaceae, 1295 

 Plumbago family, 1295 

 Plumed thistle, 1694 

 Plumegrass, 336 



bent-awn-, 336 



narrow-. 336 



silver-, 336 



sugarcane-, 338 

 Poa, 185, 231 



ampla, 192 



arctica, 190 



compressa, 189 



glaucifolia. 189 



Grayana, 189 



interior, 190 



juncifolia, 192 



leptocoma, 190 



nevadensis, 190 



palustris, 190 



pratensis, 189 



reflexa, 190 

 Poaceae, 169 

 Podostemaceae, 993 

 Podostemon, 994 



Ceratophyllum, 994 

 Pogonia, 716 



divaricata, 719 



ophioglossoides, 5, 716 



rose-, 5, 716 

 Poison 



-bean, 1059 



beaver-, 1237 



-dogwood, 1093 



-elder, 1093 



-hemlock, 1233 



-ivy, 1093 



-oak, 1093 



-sego, 650 



-suckleya, 849 



-sumac, 5, 1093 

 Pokeberry, 870 

 Pokeweed, 870 



family, 870 

 Polemoniaceae, 1369 

 Polemonium, 1370 



filicinum, 1373 



foliosissimum, 1371 

 albiflorum, 1371 

 robustum. 1371 



grande, 1371 



Hinckleyi, 1371 



pauciflorum, 1371 

 Hinckleyi, 1371 

 pauciflorum, 1371 



reptans, 1371 

 Pohcodium stamineum, 



' 1269 

 Polygala, 5, 1074 



cruciata, 1079 



Harperi, 1079 

 Hookeri, 1076 

 incamata, 1075 

 leptocaulis, 1076 

 lutea, 1081 

 mariana, 1079 

 nana, 1081 

 polygama, 1075 



obtusata, 1075 

 ramosa, 1081 

 sanguinea, 1079 

 verticillata, 1076 



ambigua, 1076 



dolichoptera, 1076 



isocycla, 1076 



sphenostachya, 1076 

 viridescens, 1079 

 Polygalaceae, 1074 

 Polygonaceae, 795 

 Polygonum, 807, 1361, 



1362, 1367 

 amphibium, 7, 820 



emersum, 823 



stipulaceum, 823 

 arenastrum, 816 

 argyrocolon, 814 

 aviculare, 816 

 bicorne, 823 

 bistortoides, 817 

 buxiforme, 816 

 coccineum, 823 

 confertiflorum, 814 

 Convolvulus, 813 

 cristatum, 813 

 densiflorum, 826 

 Douglasii, 816 

 Hydropiper. 826 

 hydropiperoides, 830 



hydropiperoides, 834 



opelousanum, 834 



setaceum. 834 

 Kelloggii, 814 

 lapathifolium, 823 



incana, 826 

 longistylum, 823 

 natans, 823 

 opelousanum, 834 

 orientale, 826 

 pensylvanicum, 820 

 Persicaria, 830 

 punctatum, 826, 830 

 ramosissimum. 817 

 sagittatum, 810 

 scandens 



cristatum, 813 

 setaceum, 834 

 texense, 813 

 virginianum, 810 

 viviparum, 817 

 Watsonii, 815 



Polypappus sericeus, 1637 

 Polypodiaceae, 61 

 Polypogon, 4, 238 



ditch-, 240 



elongatus, 240 



interruptus, 240 



monspeliensis, 238 



semiverticiUatus, 228 

 Pond-nut, 912 

 Pondweed, 3, 4, 95 



broad-leaved-, 117 



curled-, 103 



family, 95 



sago-, 95, 100 



western-, 100 

 Pontederia, 601 



cordata, 4 

 cordata, 601 

 lanceolata, 601 



lanceolata, 601 

 Pontederiaceae, 597 

 Ponthieva, 723 



racemosa, 723 

 Pony-foot, 1350 

 Poolmat, common-, 117 

 Poor joe, 1555 

 Poor man's rope, 1311 

 Poor man's soap, 1267 

 Poorman's-weatherglass, 



1291 

 Pop ash, 1303 

 Populus, 738 



acuminata, 739, 745 



angustifolia, 742, 745 



arizonica, 745 



deltoides, 748, 751 

 occidentalis, 751 



Fremontii, 745, 748 

 arizonica, 745 

 pubescens, 745 



Hinckleyana, 742 



Sargentii 



Sargentii, 748, 751 

 texana, 751 



texana, 751 



tremuloides, 751 

 aurea, 752 



Wislizenii, 745, 751 

 Porcupine caric-sedge, 527 

 Porterella, 1583 



camulosa, 1583 

 Portulaca. 881, 1361 



coronal a. 884 



lanceolata, 884 



oleracea, 884 



umbraticola. 884 

 Portulacaceae, 879 

 Posidonia, 9, 129 



Oceania, 4, 129 



1765 



