Weed Spread : Animals, Birds, Humans

Giant Parramatta grass - Sporobolus fertilis and Sporobolus africanus
  • A clumping grass growing up to 0.8-1.6m high.
  • Seed head up to 50cm long and 1-2cm wide.
  • Branches of seed head pressed to the axis and overlapping.
Giant Sensitive Plant - Mimosa diplotricha var.diplotricha
  • A shrubby or sprawling annual although behaving as a perennial vine in certain years.
  • Stem bunching, often scrambling over other plants, 4-angled, the angles lined with sharp, hooked prickles.
  • Leaves are bright green, feather like, and sensitive to touch
  • Very small pink flowers occur as round, fluffy balls about 12mm.
  • Numerous seedpods are clustered, each ab
Thornapples - Datura inoxia
  • Robust annual herbs to 1.5 m with erect branching stems.
  • Large, dark-green, leaves, shallow scalloped edges, unpleasant odour when crushed.
  • White flowers trumpet-shaped, 7-10 cm long, in upper leaf axils, sweetly perfumed.
  • Globular fruits, 4-5cm long, covered with sharp prickles.

Thornapples - Datura ferox

Physic Nut - Jatropha curcas
  • An erect shrub with one to several stems 2-4 m high reproducing by seed and suckers from roots and crown.
  • Stems arethick and rather soft, coarsely hairy, exuding a watery sap when injured.
  • Leaves are dark green, ivy like, smooth, heart shaped to 15 cm wide on a long leaf stalk.
Para Grass - Brachiaria mutica
  • A vigorous perennial grass to 2 m high.
  • Stems stout, trailing densely soft hairy rooting at nodes.
  • Leaves and sheaths generally hairy.
Grewia - Grewia asiatica
  • A large, scraggly, spreading shrub 1-4 m high.
  • Long, slender, drooping branches, the young branchlets are densely covered with hairs.
  • Leaves alternate, broadly heart-shaped and pointed at the apex, 18 cm long prominently veined (5 main veins from the base), serrated edges with whitish bloom on the underside.
  • Small orange-yellow flowers, about 1 cm long on short stal
Spiny head sida - Sida acuta
  • An erect small shrub growing to around 1.5 m.
  • Stems woody, branching several times, with well-developed tap root.
  • Leaves narrow, lance shaped, tapered both ends, serrated edges.
  • Yellow flowers, usually solitary or in pairs in the leaf axils.
  • Fruit is a hard, dark brown dry capsule, splitting into 5-8 segments each with a wedge-shaped, black seed having 2 sha
Navua Sedge - Cyperus aromaticus
  • Grows in thick grass-like clumps, usually 30-60 cm high.
  • Stems are triangular
  • Leaves are tufted.
Castor oil plant  -  Ricinus communis
  • Branching perennial shrub, 3-4 m with a spread of 2 m.
  • Stems are hollow, dull pale-green or tinged with red.
  • Palmate leaves up to 30cm wide, glossy dark reddish-green when young, glossy green when mature, divided into 7-9 roughly triangular segments each with a prominent central vein spreading out from the end of the leaf stalk, finely-toothed margins.
Praxelis  -  Eupatorium catarium
  • An annual to short-lived perennial herb, usually growing from 40-80cm tall, but can grow to 1meter.
  • Flowers throughout the year, but most commonly after onset of wet season.
  • Flowers are an intense lilac-blue colour. (Which can be confused with “bluetops”)
  • Leaves are hairy and toothed along edges.