GENUS NAME:

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

Obregonia

1 type

Ochagavia

2 types

Ochna

1 type

Ocimum

32 types

Odontonema

3 types

Oemleria

1 type

Oenanthe

1 type

Oenothera

44 types

Olea

21 types

Olearia

18 types

Olneya

1 type

Olsynium

1 type

Omphalodes

6 types

Onoclea

2 types

Ononis

2 types

Onosma

3 types

Onychium

3 types

Ophiopogon

37 types

Oplismenus

1 type

Oplopanax

2 types

Opopanax

1 type

Opuntia

187 types

Opuntua

1 type

Oraniopsis

1 type

Orbea

2 types

Orbexilum

1 type

Oreocereus

5 types

Oreostemma

1 type

Oresitrophe

1 type

Origanum

34 types

Orixa

2 types

Orlaya

1 type

Ornithogalum

15 types

Orobanche

1 type

Orostachys

7 types

Oroya

2 types

Orphium

1 type

Orthophytum

1 type

Orthosiphon

3 types

Oryza

1 type

Oryzopsis

1 type

Oscularia

3 types

Osmanthus

26 types

Osmoxylon

1 type

Osmunda

8 types

Osteospermum

17 types

Ostrya

3 types

Ostryopsis

1 type

Otacanthus

2 types

Otatea

2 types

Othonna

3 types

Otomeria

1 type

Ourisia

3 types

Oxalis

68 types

Oxydendrum

1 type

Oxytheca

1 type

Oxytropis

1 type

Ozothamnus

10 types