246 
Echinocactus—continued. 
netrelianus, 154 
neumannianus, 100 
neumannianus rigidior, 100 
nidus, 94, 207 
niger, 96 
nigricans, 95, 96, 176 
nigrispinus, 190, 191 
nobilis, 158 
nodosus, 77, 105 
nummularioides, 203 
obrepandus, 73 
obvallatus, 115, 116, 119 
obvallatus pluricostatus, 115 
obvallatus spinosior, 115 
occultus, 95 
ochroleucus, 122 
octacanthus, 122 
octogonus, 64 
odierianus, 177 
odieri, 177 
odieri magnificus, 178 
odieri mebbesii, 178 
odieri spinis nigris, 178 
olacogonus, 180 
oligacanthus, 121, 170 
orcuttii, 134, 135 
oreptilis, 180 
ornatus, 185 
ornatus glabrescens, 185 
ornatus mirbelii, 185 
orthacanthus, 138 
ottonis, 142, 195, 196 
ottonis brasiliensis, 196 
ottonis minor, 196 
ottonis pallidior, 195 
ottonis paraguayensis, 196 
ottonis pfeifferi, 196 
ottonis spinosior, 195 
ottonis tenuispinus, 195, 196 
ottonis tortuosus, 195 
ottonis uruguayus, 196 
ourselianus, 159 
ourselianus albispinus, 159 
oxyacanthus, 180 
oxygonus, 64, 65 
oxypterus, 138 
pachycentrus, 203, 204 
pachycornis, 178 
palmeri, 167, 172 
pampeanus, 200, 201 
pampeanus charruanus, 200 
pampeanus rubellianus, 200 
pampeanus subplanus, 200 
papyracanthus, g1, 92 
paraguayensis, 156 
parryi, 175 
parvispinus, 237 
pauciareolatus, 188, 189 
pectinatus, 29 
pectiniferus, 29, 30 
pectiniferus laevior, 29 
pelachicus, 180 
peninsulae, 133, 134 
pentacanthus, 115, 116 
pentlandii, 49, 54, 55 
pepinianus, 100 
pepinianus affinis, 89 
THE CACTACEAE. 
Echinocactus—continued. 
peruvianus, 102 
pfeifferi, 137, 138 
pfersdorffii, 138 
phoeniceus inermis, 14 
phyllacanthoides, 118 
phyllacanthus, 118 
phyllacanthus laevior, 118 
phyllacanthus laevis, 118 
phyllacanthus macracanthus, 118 
phyllacanthus micracanthus, 118 
phyllacanthus pentacanthus, 118 
phyllacanthus tenuiflorus, 118 
phyllacanthus tricuspidatus, 117, 118 
piliferus, 125 
pilosus, 124, 125, 126, 147 
pilosus pringlei, 125 
pilosus steinesii, 124 
pilosus steinsii, 124 
placentiformis, 219 
platensis, 163, 164 
platensis leptanthus, 163, 164 
platensis parvulus, 163 
platensis quehlianus, 163 
platensis typicus, 163 
platyacanthus, 166, 167, 171 
platycarpus, 180 
platycephalus, 181 
platyceras, 169 
platyceras laevior, 169 
platyceras minax, 169 
plicatilis, 180 
pluricostatus, 180 
poliacanthus, 198 
polyacanthus, 167 
polyancistrus, 167, 212, 213, 214 
polycephalus, 167, 174 
polycephalus flavispinus, 174 
polycephalus xeranthemoides, 173 
polyocentrus, 138 
polygraphis, 103 
polyraphis, 103 
polyrhaphis, 103 
pringlei, 125, 126 
pseudo-cereus, 98 
pseudominsuculus, 47 
pubispinus, 213 
pulchellus, 33 
pulcherrimus, 194 
pulverulentus, 178 
pumilus, 209, 210 
pumilus gracillimus, 209 
punctulatus, 180 
pycnoxyphus, 139 
pygmaeus, 210, 211 
pygmaeus phaeodiscus, 210 
pyramidatus, 90 
quadrinatus, 122 
quehlianus, 163, 164 
rafaelensis, 147 
raphidacanthus, 122 
raphidocentrus, 122 
rebutii, 180 
rectispinus, 134 
recurvus, 141, 142, 143 
recurvus bicolor, 143 
recurvus latispinus, 143 
| recurvus solenacanthus, 143 
