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Roots: O

ob-

reverse, inverse, upside down, etc. (obovatus)

obes-

fat (obesus)

obfusc-

cloudy, confused (obfuscatus)

obliq-

oblique, slanting (obliqua)

oblong-

oblong (surprise!) (oblongifolia = oblong leaves)

occi-

western (occidentalis)

ochr-

yellowish (Ochrocarpos = yellow fruit)

oct-

referring to the number eight (Octomeria = eight parts - an orchid)

ocul-

referring to an eye (oculiforma = in the shape of an eye / oculatum)

odont-

referring to a tooth (Odontoglossum = toothed tongue)

-odon(...)

referring to a tooth (Leontodon = lion's tooth)

oen-

referring to a vine, esp. the grape vine; therefore, by ex- tension, WINE (Oenothera, the evening primrose, = wine-scented)

offic-

official, recognized (usually from medicine or commerce) (officinalis)

-oide(...)

like unto (botryoides = cluster-like / malacoides = mallow-like / dendroideum = tree-like))

ole-

referring to oil (olive) (oleifera = oil-bearing)

oler-

referring to a vegetable, edible (oleracea)

olig-

few (oligocarpa = few-fruited)

oliv-

referring to an olive (olivifolia = leaves like an olive)

omni-

all (kinds)

onc-

referring to a barb, a protruberance, a tubercle (Oncidium)

ono-

referring to a donkey (Onosma = donkey + smell - which donkeys supposedly favor) !

opac-

shaded (opacus)

operc-

referring to a lid (operculatus)

ophio-

referring to a snake (Ophiopogon = snake's beard) !

-opsis

like unto (Chilopsis, lip-like) (phalaenopsis = like a moth)

orbic-

round (orbicularis)

orch-

referring to an orchid (or the sexual parts of a flower) - actually, the Gr. word, orchis refers to the male gonads (orchioides = like an orchid)

oreo- / oro-

referring to mountains (Oreocereus = mountain cactus / oreophilus = mountain-loving)

orient-

referring to the Orient, eastern (orientalis)

ornat-

showy, adorned, ornate (ornatus)

ornith-

referring to a bird (Ornithocephalus = bird's head) (ornithorhyncum = bird + snout/beak)

orth-

straight, correct (Orthocarpus = straight fruit)

osm-

referring to an odor (Osmanthus = fragrant flower)

-osm(...)

referring to an odor (Coprosma = feces + odor)

ost-

referring to a bone, therefore hardness (Osteospermum = bone seed)

-ot(...)

referring to an ear (Leonotis = lion's ear)

oval-

oval (ovalis)

ovat-

ovately shaped (ovata)

ovi-

referring to an egg (shape) (ovifera = egg-bearing)

ox- / oxy-

sharp, pointed, sour (Oxalis, referring to the oxalic acid in the leaves and roots) (oxycarpa = sharp, pointed fruit)