I am no more lonely than a single mullein or dandelion in a pasture, or a bean leaf, or sorrel, or a horse-fly, or a bumblebee. I am no more lonely than the Mill Brook, or a weathercock, or the north star, or the south wind, or an April shower, or a January thaw, or the first spider in a new house. - - Henry David Thoreau

Ochorosia sandwichensis

Ocimum basilicum (Basil)

Ohahawainui (Clermontia arborescene)

'Ohe (Bambusa vulgaris)

Ohelo papa

'Ohe'ohe (Coix lachryma-jobi)

'Öhi'a / 'Öhi'a lehua (Metrosideros polymorpha)

'öhi'a 'ai (Syzygium malaccense)

'öhi'a loke (Syzygium jambos)

Ohia kuahiwi

Okoleomakili

Olapa (Chierodendron caudicchaudii)

Olapalapa (Chierodendron caudicchaudii)

Old man's beard (Usnea spp.)

Oldenlandia diffusa (Bai hua she she)

Olea europaea

'Olena (Curcuma longa)

Olepe

Oliana

Olive

Oliwa

Onion

Ophiopogon japonicus (Mai men dong)

Ophoiglossum spp.

Opuntia spp. (pänini)

Oregano

Oriental hawksbeard (Youngia japonica)

Origanum majorana (marjoram)

Origanum vulgare

Oroxylum indicum (Mu hu die)

Osteomeles anthyllidifolia

Oxalis acetosella (Wood sorrel)

Oxalis corniculata ('Ihi makole / Zuo jiang cao)

Oxalis corymbosa

Oxalis martiana ('Ihi pehu)

Oxalis repens

Oxalis violacea