Oldenlandia, 533.
Oldfieldia, 321.
Olea, 427.
OLEACEAE, 8, 13, 30, 55, 56, 58, 425, pl. 126.
Oligocarpus, 557, 563.
Oligodora, 578.
Oligogynium, 117.
Oligomeris, 229, pl. 55.
Oligostemon, 251.
Oligothrix, 575.
Olinia, 380.
OLINIACEAE, 47, 380.
Olyra, 80.
Ommatodium, 150.
Omphalea, 317.
Omphalocarpum, 423.
Omphalodes, 466.
Omphalogonus, 444.
Omphalopappus, 569, 583.
Onagra, 399.
ONAGRACEAE, 397.
Oncinema, 451.
Oncinotis, 434.
Oncoba, 369.
Oncoba, 369.
Oncocalamus, 112.
Oncostemma, 452.
Oncostemon, 418.
Ondetia, 554.
Ongokea, 174.
Onobrychis, 285.
Ononis, 259, 266, 268, 271, 281.
Onopordon, 551.
Onosma, 465.
Operculina, 461.
Ophiobotrys, 372.
Ophiocaulon, 376.
Ophiurus, 85.
Ophrys, 152.
Opilia, 173, pl. 36.
OPILIACEAE, 20, 173, pl. 36.
Oplismenus, 82.
Opuntia, 379.
Opuntia, 379.
ORCHIDACEAE, 5, 150, pl. 26.
Orchipeda, 439.
Orchis, 152.
Orchis, 152.
Oreacanthus, 511.
Oreobambus, 89.
Oreobliton, 182.
Oreodaphne, 210.
Oreograstis, 109.
Oreosyce, 536.
Orestia, 156.
Orfilea, 314.
Oricia, 298.
Origanum, 480.
Origanum, 480.
Orlaya, 404.
Ormenis, 577.
Ormocarpum, 273, 281, 286.
Ormosia, 257.
Ornithogalum, 127.
Ornithoglossum, 128.
Ornithopus, 262.
OROBANCHACEAE, 53, 500, pl. 139.
Orobanche, 500.
Orobus, 259.
Oropetium, 89.
Orothamnus, 171.
Orphium, 432.
Ortegia, 194.
Orthanthera, 455.
Orthochilus, 157.
Orthogoneuron, 396.
Orthogynium, 201.
Orthopenthea, 607.
Orthosiphon, 473.
Orthosiphon, 473.
Orygia, 189.
Oryza, 80.
Oryzopsis, 95.
Osbeckia, 395.
Osbeckia, 394.
Osmites, 555.
Osmitopsis, 555.
Osteospermum, 557, 563.
Osterdamia, 84.
Ostryocarpus, 288.
Ostryoderris, 609.
Osyridicarpus, 172.
Osyris, 172, pl. 35.
Othonna, 568.
Othonnopsis, 568.
Otiophora, 523.
Otocarpus, 224.
Otochlamys, 579.
Otomeria, 532.
Otoptera, 277.
Otospermum, 578.
Otostegia, 479.
Ottelia, 78, pl. 7.
Oubangia, 358.
Oudneya, 222.
Ouratea, 359.
Ouret, 184.
Ourouparia, 525.
Ouvirandra, 75.
OXALIDACEAE, 29, 34, 39, 60, 62, 63, 290, pl. 69.
Oxalis, 291.
Oxalis, 291.
Oxyanthus, 528.
Oxygonum, 178, pl. 39.
Oxygyne, 150.
Oxymitra, 204, 206.
Oxystelma, 446, 451.
Oxystigma, 252.
Oxytenanthera, 88.

Pachira, 353.
Pachites, 151.
Pachycarpus, 449.
Pachylobus, 302, pl. 75.
Pachylobus, 302.
Pachypodanthium, 206.
Pachypodium, 433.
Pachyrhynchus, 563.
Pachyrrhizus, 277.
Pachystela, 422.
Pachystigma, 518.
Pachystoma, 157.
Pachytrophe, 166.
Pacourea, 436.
Paederia, 523.
Paeonia, 198.
Paepalanthus, 121.
Paepalanthus, 121.
Paivaeusa, 321.
Palaquium, 423.
Palisota, 122.
Palissya, 315.
Paliurus, 344.
Pallenis, 554.
PALMAE, 3, 4, 110, pl. 10. 11.
Palmstruckia, 220.
Panax, 401.
Pancovia, 337.
Pancratium, 136.
Panda, 289.
PANDACEAE, 27, 289.
PANDANACEAE, 2, 73, pl. 3.
Pandanus, 73, pl. 3.
Pandiaka, 184.
Pandorea, 496.
Panicum, 82.
Panicum, 82.
Papaver, 213.
PAPAVERACEAE, 19, 21, 24, 211, pl. 52.
Papaya, 377.
PAPAYACEAE, 377.
PAPILIONACEAE, 245.
Pappea, 338.
Pappea, 408.
Pappophorum, 96, 100.
Paracaryum, 467.
Paracephaëlis, 525.
Paracolea, 497.
Paradaniella, 608.
Paradenocline, 315.
Paragenipa, 528.
Paragophyton, 518.
Paranomus, 171.
Parapodium, 447.
Parapodium, 447.
Parasia, 430.
Parastranthus, 542.
Parasystasia, 510.
Parentucellia, 484.
Parietaria, 168.
Parinari, 243.
Parinarium, 243, pl. 65.
Paritium, 352.
Parkia, 245.
Parkia, 247.
Parkinsonia, 249.
Parochetus, 262, 275.
Parolinia, 216.
Paronychia, 193.
PARONYCHIEAE, 192.
Paropsia, 370.
Paropsia, 370.
Paropsiopsis, 370.
Parquetina, 442.
Parthenium, 564.
Pasaccardoa, 552.
Paschanthus, 376.
Paspalum, 82.
Passerina, 383.
Passiflora, 375.
PASSIFLORACEAE, 12, 23, 26, 374, pl. 106.
PASSIFLORACEAE, 376, 377.
Pastinaca, 408.
Pastorea, 228.
Pattara, 418.
Paullinia, 336.
Paulowilhelmia, 504.
Paulowilhelmia, 506.
Pauridia, 135.
Pauridiantha, 529.
Pausynistalia, 531.
Pavetta, 520, pl. 144.
Pavonia, 351, pl. 92.
Paxia, 244.
Paxiodendron, 208.
Payena, 423.
Payera, 530.
Pearsonia, 609.
Pechuel-Loeschea, 559.
Pectinaria, 454.
Pectinaria, 159.
PEDALIACEAE, 51, 56, 57, 58, 61, 62, 498, pl. 138.
PEDALIACEAE, 500.
Pedaliophytum, 499.
Pedalium, 499.
Pedalium, 499.
Peddiea, 381.
Pedicellaria, 215.
Pedicularis, 484.
Pedilanthus, 310.
Pedrosia, 260.
Peganum, 294.
Peglera, 300.
Pegolettia, 552, 560.
Peireskia, 378.
Pelargonium, 290.
Pelea, 296.
Peliostomum, 489.
Pelletiera, 419.
Peltophorum, 250.
Peltophorum, 250.
Pemphis, 385.
Penaea, 380.
PENAEACEAE, 14, 379, pl. 108.
PENAEACEAE, 379.
Penianthus, 201, 202.
Penicillaria, 81.
Pennisetum, 81.
Pentabrachium, 320.
Pentacarpaea, 531.
Pentaclethra, 245.
Pentadesma, 362.
Pentadiplandra, 349.
Pentagonia, 481.
Pentaloncha, 530.
Pentameris, 99.
Pentanisia, 518.
Pentanopsis, 533.
Pentapera, 417.
Pentarrhinum, 448.
Pentas, 532.
Pentaschistis, 99.
Pentasticha, 109.
Pentatrichia, 560.
Pentatropis, 448.
Penthea, 151.
Pentheriella, 572.
Pentodon, 533.
Pentopetia, 445.
Pentopetia, 444.
Pentopetiopsis, 444.
Pentzia, 578.
Peperomia, 161.
Peplidium, 493.
Peplis, 384.
Peponia, 539.
Peponium, 539.
Perdicium, 552.
Pergularia, 448, 453.
Perianthostelma, 448.
Periblema, 507.
Perichasma, 200.
Perichlaena, 496.
Perideraea, 577.
Periestes, 511.
Periglossum, 451.
Perinerion, 435.
Peripeplus, 524.
Periploca, 442, 443.
PERIPLOCACEAE, 442.
Peristrophe, 514.
Peristylus, 151.
Perithrix, 443.
Perotis, 84.
Perotriche, 562.
Perralderia, 560.
Perriera, 300.
Persea, 211.
Persea, 211.
Persica, 242.
Pervillaea, 453.
Petalacte, 556.
Petalactella, 556.
Petalidium, 505.
Petalidium, 505.
Petalodiscus, 320.
Petalonema, 396.
Petasites, 567.
Petersia, 387.
Petrobium, 564.
Petrophyes, 232.
Petroselinum, 413.
Petroselinum, 414.
Peucedanum, 409.
Peucedanum, 408, 409, 612.
Peyrousea, 578.
Phaca, 270.
Phaenocoma, 557.
Phaenohoffmannia, 265, 274.
Phaeocephalus, 584.
Phaeomeria, 147.
Phaeoneuron, 396.
Phaeopappus, 550.
Phaeoptilon, 187.
Phagnalon, 562, 575, 583.
Phaius, 157.
Phalangium, 132.
Phalaris, 94.
Pharbitis, 462.
Pharnaceum, 189.
Phaseolus, 277.
Phaulopsis, 505.
Phaylopsis, 505.
Phelipaea, 500.
Phellolophium, 410.
Phenax, 169
Phialodiscus, 338.
Philippia, 417, pl. 120.
Phillipsia, 506.
Phillyrea, 426.
Philoxerus, 183.
Philyrophyllum, 554.
Phleum, 95.
Phloga, 114.
Phlogella, 114.
Phlomis, 478.
Phoberos, 371.
Phoebe, 211.
Phoenicophorium, 113.
Phoenix, 110.
Phormium, 134.
Phornothamnus, 396.
Photinia, 240.
Phragmites, 101.
Phrynium, 149.
Phrynium, 148.
Phycagrostis, 74.
Phygelius, 492.
Phylica, 345.
Phyllactinia, 552.
Phyllanthus, 323, pl. 80.
Phyllarthron, 497.
Phyllis, 523.
Phyllobotryum, 370.
Phylloclinium, 370.
Phyllocomos, 120.
Phyllocosmus, 292.
Phylloctenium, 497.
Phyllodes, 148.
Phyllopodium, 493.
Phyllorhachis, 80.
Phyllosma, 297.
Phylloxylon, 270.
Phymaspermum, 580.
Physacanthus, 506.
Physalis, 483.
Physaloides, 483.
Physanthyllis, 260.
Physedra, 539.
Physena, 372.
Physocaulis, 406.
Physospermum , 407.
Physostigma, 277.
Physotrichia, 410.
Phytolacca, 188.
PHYTOLACCACEAE, 9, 12, 14, 187.
Piaranthus, 454.
Picconia, 426.
Picnomon, 551.
Picralima, 437.
Picralima, 440.
Picridium, 547.
Picris, 546.
Pierreodendron, 300.
Pierrina, 358.
Pilea, 169.
Pilogyne, 537.
Pilostyles, 177.
Pimenta, 392.
Pimpinella, 412.
PINACEAE, 1, 10, pl. 2.
Pinardia, 566.
Pinus, 71.
Piper, 161, pl. 27.