Plants
Articles about plant species, botany and vegetation.
Nymphaea nouchali
Nymphaea nouchali (blue star water-lily)
Nymphaea pubescens
Nymphaea pubescens — hairy water lily (pink water-lily)
Nymphaeaceae
Nymphaeaceae (water-lily family)
Nymphaeales
Nymphaeales (water lilies and related aquatic plants)
Oak
Ocimum tenuiflorum
Ocimum tenuiflorum (Tulsi) — holy basil plant
Oenothera
Oklahoma Rose
Okra
Okra (Abelmoschus esculentus): description, cultivation, culinary and cultural uses
Olea capensis
Oleaceae
Oleaceae (Olive Family): Taxonomy, Characteristics, and Uses
Oleander
Oleander (Nerium oleander) — ornamental, toxic Mediterranean shrub
Olive
Olive tree
Olive tree (Olea europaea)
Olmedilla Photovoltaic Park
Onagraceae
Onagraceae — the Evening-Primrose and Willowherb Family
Onion
Onion — Allium cepa: overview, characteristics, uses and history
Opium
Opium: composition, history, uses, and social impacts
Opium poppy
Opium poppy (Papaver somniferum): biology, history, and uses
Orchard
Orchard: cultivation and uses of fruit- and nut-bearing trees
Orchid
Orchid (color)
Oregano
Origanum
Ornamental plant
Ornamental plant: decorative horticulture, uses and cultivation
Orto botanico di Pisa
Orto botanico di Pisa — University of Pisa Botanical Garden
Ovule
Ovule (plant structure that gives rise to seeds)
Oxalidaceae
Oxalidaceae — the wood-sorrel family of flowering plants
Oxalidales
Oxalidales — an order of flowering plants
Paleobotany
Palisade cell
Palm
Palm: hand anatomy, palms (Arecaceae), measures and cultural meanings
Palm tree
Palm tree: overview, biology, uses, and cultural importance
Palmeral of Elche
Palmeral of Elche (Palm Grove of Elche)
Pandanales
Pandanales (order of tropical monocot flowering plants)
Pando (tree)
Pando (the trembling giant): a clonal aspen colony in Utah
Papaver bracteatum
Papaver bracteatum (Iranian or Persian poppy)
Papaveraceae
Papaveraceae — the poppy family: description, traits, and uses
Papaya
Para rubber tree
Para rubber tree (Hevea brasiliensis)
Parsley
Parsley: varieties, cultivation, culinary uses and nutrition
Passiflora
Passiflora (passionflower): overview, characteristics, and uses
Passifloraceae
Pea
Peach
Peanut
Pear
Pear (fruit): description, varieties, cultivation and uses