115 



Petalostemon 49, 50, 51 



Petunia ^ 91 



Phacelia 82 



Phalaris 14 



Philoxerus 33 



Phlox . 81 



Phoradendron 29 



Phyllanthus 57 



Physalis 89 



Physostegia 68 



Physostegia 88 



Phytolacca 33 



Pinaropappus ill 



Plantago 95, 96 



Platanus 41 



Pleurobolus 52 



Poa 17, 18 



Polanisia 41 



Polecarpon 35 



Polemonium 81 



Polygala 57 



Polygonum 30, 31 



Polypremum 76 



Polypteris 108 



Polytaenia 72 



Porliera 55 



Portulaca 35 



Prosopis 5, 6, 29, 45 



Prunus 42 



Psoralea 47, 48 



Psoralea . 49 



Ptelea ... 56 



Pterota 56 



Ptilepida 109, no 



Ptilimnium 73 



Pyrrkopappus Ill 



Quercus 49 



Ranunculus 37 



Rhamnus 63 



Rhantnus 63 



Rhus 6l, 62 



Ridan 106 



Rivina 33 



Roripa 39, 41 



Rosa 42 



Rudbeckia 104 



Rudbeckia 104 



Ruellia 94 



Rumex 30 



Rutosma 56 



Salix 26 



Salvia 86 



Salviastrum 86 



Samolus 74, 75 



Sanicula 72 



Sapindus 8, 62 



Sarratia 3 1 



Schinus 56 



Schizocarya -71 



Schoenocaulon 24 



Schoenus . . . 20 



Schrankia 44 



Scirpus 19, 20 



Scutellaria 87, 88 



Senecio no 



Sesbania ... 51 



Sesleria 16 



Sesuvium 35 



Setaria 13, 14 



Sicydium 99 



Sida .... . 65, 66 



Sida 64 



Sieglingia 16, 17 



Silene . . . .' 35 



Silphium 103 



Siphonoglossa 95 



Sison 73 



Sisymbrium 39 



Sisymbrium 39, 40 



Sisyrinchium 25 



Sitilias .. in 



Smilax 24 



Solanum 90 



Solatium . . 89 



Sophora ... 46 



Sorghum 10 



Specular ia . . 99 



Spergularia 36 



Spermolepis 73 



Sphaeralcea . . ... 67 



Spigelia 76 



Stachys 88 



Stemmodontia 105 



Stevia 108 



Stillingia 59 



Suaeda 4, 31 



Symphoricarpos . ... . 98 



Synedrella .... . . . 106 



Syntherisma 12 



Synthlipsis 41 



Talinum 35 



Taxodium 9 



Tetragonotheca .... ... 105 



Teucrium . 88, 89 



Thamnosma . 55 



Thelesperma . 7, 107 



Thryallis ... .... 54 



Thurberia ... 15 



Tillandsia . 21 



Tinantia 22 



Tissa 36 



Tradescantia 21 



Tradescantia 22 



Tragia 59 



Tragus IO 



Tribulus . .... . .55 



Trie odium ... 15 



Tricuspis 16, 17 



Trifolium 47 



Triodia . . . 16 



Trisetum 15 



Troximon .III 



