| Oligomerus |
|
| Oligonychus ilicis |
|
| Oligonychus ununguis |
|
| Oligonychus yothersi |
|
| Oligotoma saundersii |
|
| Ommatoiulus moreleti |
|
| Omorgus suberosus |
|
| Oncopeltus fasciatus |
Large Milkweed Bug |
| Opeas hannense |
|
| Opecoelid |
|
| Ophiomyia camarae |
|
| Ophiomyia texana |
|
| Ophiomyia valida |
|
| Ophion |
|
| Ophion bermudensis |
|
| Ophiopogon japonicus |
Dwarf Lily Turf; Dwarf Lilyturf; Mondo Grass |
| Oplismenus burmanni |
Variegated Oplismenus |
| Oplismenus compositus |
Wood Grass; Awned Panick Grass |
| Opogona sacchari |
Banana Moth |
| Opuntia cochenillifera |
Cochineal Plant |
| Opuntia leucotricha |
Aaron's Beard |
| Opuntia tomentosa |
Velvet Prickly Pear; Woollyjoint Prickly Pear |
| Orchelimum concinnum |
Dusky-Faced Meadow Katydid; |
| Oreomecon nudicaulis nudicaulis |
Icelandic Poppy; Iceland Poppy |
| Origanum majorana |
Sweet Majoram |
| Origanum vulgare |
Oregano |
| Orius insidiosus |
Insidious Pirate Bug |
| Ornithogalum arabicum |
Star of Bethlehem |
| Ornithonyssus bursa |
Starling Mite; |
| Orthocladius |
|
