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Cyperus decompositus

Family

Cyperaceae

Botanical Name

Cyperus decompositus (R.Br.) F.Muell.

Mueller, F.J.H. von (1874) Fragmenta Phytographiae Australiae 8: 267. Type: ?.

Synonyms

Mariscus decompositus R.Br., Prod.: 218(), Type: Northern Australia, R. Brown; holo: BM?.

Stem

Usually flowers and fruits when about 1-2 m tall.

Leaves

Leaf blades about 81-120 x 1-2 cm, V-shaped in transverse section particularly towards the base. Margin and midrib on the lower surface finely toothed.

Flowers

Inflorescence terminal, produced on a long peduncle which usually ends in a whorl of leafy bracts, sometimes with spaced leafy bracts at various points on the peduncle. Inflorescence a panicle of spikes.

Fruit

Nut about 2.5 mm long. Perianth persistent at the base of the nut. Embryo about 1 mm long.

Seedlings

First leaf linear, second leaf linear, about 20 x 1 mm. Leaf bases sheathing the stem. At the tenth leaf stage: leaf blades linear, 40-45 x 0.6 cm, venation longitudinal and parallel, petiole 20-25 mm long, base sheathing.

Distribution and Ecology

Occurs in NT, CYP, NEQ and southwards as far as south-eastern Queensland. Altitudinal range from near sea level to 200 m. Grows in open forest, rain forest and beach forest.

Natural History

Food plant for the larval stages of the Six-spot Skipper Butterfly. Common & Waterhouse (1981).

CYP

X

NEQ

X

Grass

X

RFK Code

3494