INDEX 
691 
Opoponax, gum, Opoponax 
Opp., opposite, 45, 51 
Oppositifolius (Lat.), with oppo- 
site leaves 
-opsis (Gr. suffi.), like 
Optimum temperature, 35 
Orache, Alriplex 
Orange, Citrus ; -grass (Am.), 
Hypericum Sarothra Michx. ; 
Jamaica mandarin-, Glycosmis ; 
Osage-, Maclura\ -root (Am.), 
Hydrastis ; wild- (W. I.), Dry- 
petes 
Orbicular, 52 
Orchard grass (Am.), Dactylis 
Orchid tree, Amherstia 
Orchis, Orchidaceae ; bee-, Ophrys ; 
bird’s nest-, Neottia ; butterfly-, 
Habenaria ; early purple-, 
Orchis ; fly-, Ophrys ; frog-, 
Habenaria*, lady’s slipper-, 
Cypripediu m ; man-, A ceras ; 
musk-, Herminium ; scented-, 
Habenaria', spider-, Ophrys ; 
spotted, Orchis 
Ordeal, Erythrophlaeum', -bean, 
Physostigma 
Orgadium (Cl.), an open woodland 
formation 
Organs, 19; abortion of, 315 
accessory, 67 ; analogous, 30 ; 
classification, 31; concrescence, 
70; development, 28; essential, 
66; homologous, 27, 28; in- 
ternal structure, 28 ; mode of 
origin, 28 ; multiplication, 70 ; 
orientation, 36; position, 28; 
reproductive, 32, 54; rudi- 
mentary, 31, 68; suppression, 
31; symmetry, 31 ; vegetative, 
32; vestigial, 31, 123 
Orientation of organs, 36 
Ornamental plants, 207, Acalypha , 
Acer , &c. 
Ornitho- (Gr. pref.), bird- ; -phily, 
99 
Orophytium (Cl.), a sub-alpine 
plant formation 
Orpine, Sedum 
Orris-root, Iris 
Ortho- (Gr.pref.), upright, straight; 
-plocous, Cruciferae ; -stichies, 
straight ranks ; -trop. , -tropous, 
82 ; -tropic, 36 
Osage orange, Maclura 
Osier, Salix 
Ostiolate, with a mouth 
Oswego tea, Monarda 
Otaheite-apple (W. I.), Malay 
apple; -gooseberry (W. I.), 
Phyllanthus distichus Muell.- 
Arg. 
Otto of roses, Rosa 
Outfit for collecting, 1 1 
Ov., ovule, ovary, 79,' 80, 81, 82, 
55 > 59 
Oval, 52 
Ovate, 52 
Ovoid, solid oval 
Ovuliferous scale, Coniferae 
Ovum, 55, 81, 104 , Angiospermae, 
Pteridophyta 
Ox-eye daisy, Chrysanthemum ; 
-lip, Primula 
Oxodium (Cl.), a humus marsh 
formation 
Oyster-plant, salsify 
P., perianth 
p., page 
Pac., Pacific 
Pachycarpous, with thick pericarp 
Padauk, Ptero carpus 
Paddy (rice) Oryza 
Paeony, Paeonia 
Paigle, cowslip 
Paint-brush, Castilleja ; -root, 
Lachnanthes 
Painted cup, Castilleja ; -lady, 
Castilleja 
Palaearctic, Old World Arctic 
Palaeobotany, 2 ; -trop., tropical, 
Old World tropical 
Pale, palea, palet, Gramineae 
Paleaceous, chaff-like 
Palisade tissue, 48, 142, 161 
Pallens (Lat.), pale-coloured 
Palm, Palrnae', Assai-, EiUerpe', 
cabbage-, Oreodoxa ; -cabbages, 
Cocos ; Carbauba-, Copemicia ; 
coconut-, Cocos ; Coquito-, Ju- 
baea; date-, Phoenix', doum-, 
44—2 
