Nutgrass
Cyperus rotundus |
A wide spread perennial sedge with an unjointed stem, triangular in cross section.
Bright green leaves emerge at ground level tapering to a point.
Inflorescence a loose umbel of brown to purple flattened spikes subtended by 2-4 leaf bracts.
Underground spherical to egg-shaped tubers (nuts) are formed on rhizomes, giving rise to new shoots and rhizomes. |
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Paspalum
Paspalum dilatatum |
Native to South America.
A tufted perennial up to 1m high with short rhizomes.
Leaf blades hairless and angled along the mid-rib.
Inflorescence of 3-7 spike-like racemes usually less than 5cm long, diverging almost at right angles from the main axis. |
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Pennyweed
Hydrocotyle tripartite |
Native of Australia.
A perennial with creeping prostrate stolons and rhizomes which root at the nodes.
The leaves are divided to the petiole.
Flowers are sessile, greenish-yellow and inconspicuous.
Often found in sheltered, moist soils. |
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Pennywort
Hydrocotyle bonariensis |
Native of South America.
A scrambling prostrate perennial with stolons.
Leaves bright green, circular margins with rounded teeth on a long petiole attached to the centre back of leaf.
Flowers are compound umbels, many branches and flowers. Inhabits maritime areas and sandy soils in lawns and gardens. |
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Pig weed
Portulaca oleracea |
A succulent prostrate summer annual with reddish brown stems. Leaves shiny, oblate to wedge shaped 1-2cm long.
Flowers yellow, solitary to clusters in the leaf axles.
A common weed occurring throughout Australia in cultivated
soils of high rainfall. |
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Prairie Grass
Bromus catharticus |
A densely tufted short-lived perennial grass with hairy lower leaf sheaths.
Leaf blades hairless and often rough to touch.
Inflorescence a pannicle which tends to droop, with flattened spikelets. |
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Salvinia
Salvinia molesta |
A free-floating aquatic weed up to 30cm long.
Leaves covered in dense hairs in whorls of three, the upper two folded and the lower divided and root-like.
It can smother large areas of water causing major problems to
other plants, aquatic animals and pumps. |
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Summer Grass
Digitaria sanguinalis |
A summer annual with fibrous roots and clusters of soft stems which grow close to the ground and may not root at the nodes.
Leaves soft and hairy.
Inflorescence compound of 3-13 spikes spreading out from a slender stem.
A major weed throughout the world in both temperate and tropical climates. |
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White Clover
Trifolium repens |
Native of Europe.
A perennial with stolons, the leaves are trifoliate and heart-shaped.
Leaf markings can vary from black to purple or white crescents.
Flowers are white, carried on a round head with the flower stalk
longer than the leaf.
Stems and leaves are hairless.
Tap roots arise from the nodes on the stolons. |
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White Root Lobelia
Pratia purpurascens |
A perennial with very strong stolons and with many white rhizomes.
The rhizomes produce deep tap roots at each node.
The leaves are small, narrow, elliptical, toothed and held closely to the stem, dark green above and purple coloured beneath.
Flowers are very small and tubular on fine axillary stems. |
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Winter Grass
Poa annua |
Native to Europe.
An annual or short-lived perennial with a tufted habit.
Leave light green, soft with a small membranous ligule.
Inflorescence a pyramid-shaped panicle produced just above the leaves.
May be perennial in golf greens.
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