Punica 143 
Purpusia 103 
Purshia 103 
Pycnanthemum 179 
Pyrola 153 
Pyrrhopappus 235 
Pyrrocoma 204 
Pyrularia 62 
Pyrus 99 
Pyxidanthera 156 
Quamasia 51 
Quamoclit 164 
Quercus 60 
QOuincula ISI 
Rafinesquia 234 
Raillardella 228 
Raineria 228 
Ramona 178 
Randia 193 
Ranunculus 80 
Ranunculus So, 82 
Raphanus 87 
Rapistrnm 87 
Ratibida ANG] 
Razoumotskya 62 
Redfieldia 28 
Reimeria 19 
Reseda 2 
Reverchonia 125 
Reynosia 131 
Rhagadiolus 233 
Rhamnidium 131 
Rhamnus 131 
Rhaphidophyllum 2 
Rhexia 143 
Rhinanthus Igo 
Rhizophora 143 
Rhododendron 154 
Rhodora 154 
Rhus 129 
Rhynchosia 122 
Rhynchospora a7 
Ribes 96 
Richardia 193 
Ricinella 126 
Ricinus 126 
Riddellia ° 222 
Rigiopappus 224 
Rivina 70 
Robinia 114 
Romanzotha 170 
Romneya 83 
Roripa 87 
Rosa Log 
Rotala 144 
Rothrockia 163 
Rottboellia i) 
Roubieva 67 
Roulinia 163 
Rubus 99 
Rubus 1oo 
Rudbeckia 216 
Ruellia 19! 
Rumex 66 
bo 
wn 
Oo 
Ruppia 
Rydbergia 
Sabal 
Sabbatia 
Sageretia 
Sagina 
Sagittaria 
Salicornia 
Salix 
Salizaria 
Salpichroa 
Salsola 
Salvia 
Salviastrum 
Salvinia 
Sambucus 
Samolus 
Sanicula 
Sanguinaria 
Sanguisorba 
Sanvitalia 
Sapindus 
Sapium 
Saponaria 
Sarcobatus 
Sarcodes 
Sarothra 
Sarracenia 
Sartwellia 
Sassafras 
Satureia 
Saururus 
Saussurea 
Savastana 
Saxifraga 
Saxtfraga 
Saxifragopsis 
Scabiosa 
Scaevola 
Scandix 
Schaefferia 
Schedonnardus 
Scheuchzeria 
Schinus 
Schizaea 
Schizandra 
Schizonotus 
Schkuhria 
Schoénocaulon 
Schoenocrambe 
Schoenolivion 
Schoepfia 
Schrankia 
Schwalbea 
Schweini(zia 
Scirpus 
Scleranthus 
Scleria 
Scler« carpus 
Sclerolepis 
Scleropogon 
Scoliopus 
Sce re chk yal 
Scolopendrinm 
Scolymus 
Scoparia 
Scorzonella 
Scribneria 
Scrophularia 
Scutellaria 
Sebastiania 
Secondatia 
Sedum 
Selaginella 
Selenia 
Selinocarpus 
Selinum 
Sempervium 
Senebtera 
Senecio 
Sereneum 
Serenoa 
Sericocarpus 
Serinea 
Serjania 
Sesamum 
Sesban 
Seshania 
Sesuvium 
Sequoia 
Setaria 
Seymeaia 
Shepherdia 
Sherardia 
Shortia 
Sibara 
Sibbaldia 
Sibbaldiopsis 
Sicyos 
Sicyosperma 
Sida 
Sidalcea 
Sidalcea 
Sideroxylon 
Sieglingia 
Sieversia 
Silene 
Silphium 
Stlybum 
Simarouba 
Simondsia 
Sinapis 
Siphonoglossa 
Siphonychia 
Sisymbrium 
Stsvinbrium 
Sisyrinchium 
Sitanion 
Sitilias 
Sium 
Smelowskia 
Smitlacina 
Smilax 
Solanum 
Solea 
Solidago 
Solidago 
Soliva 
Sonchus 
Sonnea 
Sophia 
203, 
