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Pinus pinaster, Pine Tree, Maritime Pine, Cluster Pine
Oxalis pes-caprae, Sour Sob, African wood sorrel, African wood-sorrel, African woodsorrel, Bermuda buttercup, buttercup oxalis, Cape cow-slip, Cape cowslip, Cape sorrel, drooping wood sorrel, Englishweed, large yellow soursob, oxalis, shamrock, sorrel, sour grass, sourgrass, soursob, soursobs, soursop, soursops, South African wood sorrel, variable wood sorrel, variable wood-sorrel, wild sorrel, wood sorrel, yellow flowered oxalis, yellow sorrel, yellow sour-grass, yellow-flowered oxalis
Oxalis purpurea, (Oxalis glabra and
Oxalis bowiei are also similar) 4 o'clock, four o'clock, grand duchess, large flower wood sorrel, large-flower wood sorrel, largeflower
wood sorrel, large-flower wood-sorrel, large-flowered wood sorrel, large-flowered wood-sorrel, large-leaf wood-sorrel, one o'clock,
one-o'clock, purple oxalis, purple wood sorrel, purple woodsorrel, sorrel
Oenothera drummondii, Beach Evening Primrose, and several other coastal Oenothera species.
Oenothera stricta, Common Evening Primrose
(roadside through Wheatbelt and Great Southern)
Oligocarpus calendulaceus, Osteospermum calendulaceum, Calendula parviflora, Oligocarpus tripteroides
Oncosiphon piluliferum, formerly Pentzia globifera, Globe matricaria, Globe Chamomile, Stinknet, Matricaria Oncosiphon
suffruticosum is similar and is known as Calomba Daisy, Shrubby Mayweed, Chamomile, Matricaria, Mayweed, Sheepbush, Stinking Daisy,
Stinking Weed, Yellow Top, Yellow Weed, Pentzia
Ornithogalum thyrsoides, Chincherinchee (white cluster pointed head, highly toxic)
Ornithopus
compressus, Yellow Serradella
Orobanche minor, Lesser Broomrape, The Hellroot, Common Broomrape, Lesser Broomrape, Small Broomrape, Clover Broomrape
Oxalis corniculata, creeping woodsorrel, procumbent yellow sorrel, sleeping beauty, creeping oxalis, yellow wood-sorrel. Oxalis corniculata var. atropurpurea refers to the purple colouring of the foliage.
Parentucellia latifolia, common bartsia, red bartsia, broadleaf glandweed, red tarweed, southern red bartsia
Portulaca oleracea, Purslane, Common Purslane, Pigweed, Black Pigweed, Duckweed, Munyeroo. Verdolaga, Red Root, Hogweed, Pursley. A
variable plant across Australia that may include native and introduced forms. Edible.
* Phytolacca americana, Pokeweed, Poke berry (a new arrival, fast spreading, purple berries, toxic), also can be known as Scoke,
Red Ink Plant, Pigeonberry, Inkberry, Garget, Common Pokeweed, Coakum, Cancer Jalap, Virginia Poke, American Pokeweed, American Cancer. Large leaves and sprays of berries hang down.
Petrorhagia dubia, Velvet Pink, wild carnation
Podalyria sericea, Cape Sweetpea, Silver Sweetpea, Satin Bush, Pastel pink pea flowers, oval light green leaves with a furry surface giving silvery appearance.
Polygala myrtifolia, Myrtleleaf Milkwort. A common purple flowered shrub in coastal areas Perth to
Albany. This is a Declared weed in South Australia.
Oxalis incarnata, Pale-flowered Oxalis, Pale Wood Sorrel
Oxalis debilis var. corymbosa, large flowered pink sorrel, large-flowered
pink-sorrel, lilac oxalis, pink shamrock, pink wood sorrel, pink wood-sorrel, pink woodsorrel, violet wood-sorrel, violet woodsorrel. Flowers from pink to magenta.
Oxalis glabra, Finger-leaf Oxalis. Similar to Oxalis purpurea but with finer leaves
Polygonum aviculare, Wireweed, also known in different countries as Wiregrass, Common Knotgrass, Prostrate knotweed, Lowgrass, Bridweed,
Birdgrass, Pigweed, Hogweed, Doorweed, Waygrass, Kneity-knot, Bird's tongue, Blackstrap, Pigrush, Nine-joints, Cow grass.
Phytolacca octandra, Inkweed. Similar to Pokeweed, but sprays of berries are more upright.