586 
Oenothera 
biennis 2 594-5 
brachycarpa 604 
caespitosa 603 
canescens 605 
canovirens 596 
chrysantha 601 
coronopifolia 598 
cruciata 594 
Fremontii 606 
fruticosa 602 
“ humifusa 600 
glauca 602 
grandiflora 595 
guttulata 605 
humifusa 597, 600 
laciniata 597 
Lamarckiana 595 
latifolia 599 
linifolia 600 
linearis 601 
lavendulaefolia 607 
longipedicellata 600 
macrocarpa 605 
minima 597 
MiSSOUTIENSIS 605 
muricata 595 
Nuttallii 599 
Oakesiana 596 
pilosella 602 
pallida 599 
pinnatifida 598 
pratensis 601 
pumila 601 
rhombipetala 597 
serrulata 608 
scapigera 603 
sinuata 597 
speciosa 603 
strigosa 596 
triloba 604 
“ parviflora 604 
see Anogra 598 
neiffia 599 
Oldenlandia 3 254 
angustifolia 254 
coerulea 251 
corymbosa 254 
glomerata 254 
minima \ 252 
purpurea 253 
uniflora 254 
see Houstonia 250-4 
OLEACEAE 2 724 
Oligoneuron 
canescens 3 397 
ONAGRACEAE 2 584 
Onagra 94-6 
see Oenothera 
biennis 594 
cruciata 594 
Oakesiana 596 
Onoclea I 10 
sensibilis Ir 
Struthiopteris 1 
Ononis 
repens 2 353 
Onopordon 3555 
Acanthium 556 
Onosmodium 3 90 
carolinianum gI 
hispidum 90 
hispidissimum gr 
molle 91 
occidentale gI 
subsetosum go 
sylvestre 91 
virginianum 90 |. 
Onychium 
densum I 33 
Oonopsis 3 377 
(Bigelovia in part) 
Oonopsis 
Engelmanni 3 377 
multicaulis 377 
OPHIOGLOSSACEAE I 1 
Ophioglossum Ir 
arenarium 2 
Engelmanni 2 
vulgatum 2 
Ophiorhiza 
Mitreola 2 731 
Ophrys I 567 
auriculata 568 
australis 568 
cernua 565 
convallarioides 567 
Corallorhiza 574 
cordata 568 
liltifolia 572 
Loeselii 572 
monophyllos 57T 
ovata 567 
Smallii 567 
spiralis 563 
Oplopanax 
horridum 2 619 
Opulaster ~ 2 243 
(Physocarpa) 
(Neillia) 
australis 244 
intermedius 244 
opulifolius 244 
Opuntia 2 571 
arborescens 573 
camanchica gua 
fragilis 573 
humifusa 572 
macrorhiza 572 
mesacantha 572 
missouriensis 573 
Opuntia a7 
polyacantha 573 
Rafinesquit 572 
tortispina B72 
vulgaris 571 
ORCHIDACEAE I 547 
ORCHIDEAE I 547 
Orchis I 550 
blephariglottis 557 
bracteata 552 
ciliaris 557 
clavellata 553 
cristata 557 
dilatata 554 
fimbriata 558-9 
fissa 558 
flava 552 
grandiflora 558 
hyperborea 554 
huronensis 554 
integra 553) 
lacera 558 
leucophaea 558 
militaris 551 
nivea 553 
obtusata 556 
orbiculata 555 
psycodes 559 
rotundifolia 551 
spectabilis 551 
tridentata 553 
virescens $52 
Oreocarya 3 80 
(Eritrichium and 
Krinitzkia in part) 
fulvocanescens 82 
glomerata 81 
sericea 81 
suffruticosa 80-1 
Origanum 3 140 
flexuosum 142 
vulgare 140 
Ornithogalum 1 509 
GENERAL INDEX OF LATIN GENERA AND SPECIES. 
Ornithogalum 
arabicum I 509 
bivalve 501 
hirsutum 534 
nutans 510 
umbellatum 509 
OROBANCHACEAE 3 233 
Orobanche 234 
americana 235 
fasciculata 224 
ludoviciana 235 
major Bey 
minor 235 
purpurea 234 
ramosa 234 
uniflora 233 
virginiana 236 
Orontium I 445 
aquaticum 445 
Orophaca 2 387 
(Astragalus in mir) 
argophylla 388 
caespitosa 387 
sericea 388 
Orthocarpus 3 216 
luteus 216 
ORYZEAE I 108 
Oryzopsis I 174 
asperifolia 174-5 
canadensis 174 
cuspidata 174 
juncea 174 
melanocarpa 17S 
membranacea £74 
micrantha 175 
pungens 174 
racemosa 175 
Osmorrhiza 2 627-8 
brevistylis 627 
Claytoni 627 
divaricata 628 
longistylis 628 
obtusa 628 
see Washingtonia 
627-8 
OSMUNDACEAE ng 
Osmunda 17 
cinnamomea 7 
Claytoniana 8 
interrupta 8 
lanceolata 6 
Lunaria 3 
matricariae 5 
regalis a 
Struthiopteris ti 
virginiana 6 
Ostrya I 606 
Ostrya 606 
virginiana 606 
virginica 606 
thake 3.507 
callosum 507 
sphacelatum 507 
tenuifolium 507 
Otophylla 3 213 
auriculata 213 
densiflora 214 
OXALIDACEAE 2 430 
Oxalis 2 430 
Acetosella 431 
Brittoniae 434 
Bushii 433 
corniculata 432 
cymosa 435 
filipes 433 
grandis 435 
Priceae 434 
recurva 435 
repens 432 
rufa 433 
stricta 432 
violacea 
431 
Vor, III. 
Oxybaplius 2 31 
see Allionia 2 31 
albidus 31 
angustifolius 31 
hirsutus 32 
Oxycoccus 2 704 
erythrocarpus 705 
macrocarpus 705 
Oxycoccus 704 
palustris ~ 704 
Oxydendrum 2 691 
arboreum 692 
Oxygraphis 2 117 
Cymbalaria 117 
“alpina 117 
Oxypolis 2 637 
{ Tiedemannia) - 
filiformis 638 
longifolius 638 
rigidus 638 
Oxyria I 659 
digyna 659 
reniformis 659 
Oxytropis 2 388 
arctica 389 
“inflata 389 
Belli 391 
campestris 390 
“ coerulea 390 
inflata 389 
“ johanensis 390 
Lamberti 390. 
montana 388 
multiceps 389 
podocarpa 389 
sericea 390 
splendens 390 
Pachiloma 2 633 
Pachylophus 603 
(Oenothera in eee 
caespitosa 603 
Nuttallii 603 
Pachypodium 
integrifolium 2 169 
Pachysandra 480 
procumbens 480 
Pachystima 2 492 
Canbyi 492 
Myrsinites 492 
Padus 2 328 
demissa 329 
melanocarpa 329 
nana 329 
virginiana 329 
Paepalanthus 
flavidulus I 455 
Palafoxia 
Hookeriana 3 507 
Panax 2 618 
(Aralia in nee 
horridum 619 
quinquefolium 618 
trifolium 619 
Pancratium 
carolinianum 1 533 
occidentale 533 
PANICEAE I 108 
Panicularia I 262 
(Glyceria) 
acutiflora 266 
americana 265 
angustata 267 
borealis 266 
brachyphylla 266 
canadensis 263 
distans 268 
“ airoides 268 
elongata 264 
fluitans 266 
grandis 265 
laxa, 263 
