Scientific Name:
Cyperaceae Juss.

Herbs, usually perennial, often rhizomatous. Stems usually solid, often 3-angled. Leaves usually linear, some or all often reduced to basal sheaths. Flowers hermaphrodite or unisexual, each in the axil of a glume (bracteole), arranged in spikelets; inflorescence various, a simple or compound irregular umbel or panicle, or a capitate cluster of spikelets or a solitary terminal spike; commonly with 1 to several setaceous to leaf-like involucral bracts. Perianth of bristles, scales, hairs or 0. Stamens 3–(2–1), rarely 4–6. Ovary superior, 1-locular; style-branches 2 or 3; ovule solitary. Fruit a nut, indehiscent.

[From:  Healy and Edgar (1980) Flora of New Zealand. Volume 3.]

Number of species and named hybrids in New Zealand within Cyperaceae Juss.
Indigenous (Endemic)126
Indigenous (Endemic): Sometimes present1
Indigenous (Non-endemic)49
Exotic: Fully Naturalised43
Exotic: Casual8
Cronquist, A. 1988: The evolution and classification of flowering plants. The New York Botanic Gardens, New York.
Mabberley, D.J. 2008: Mabberley's plant book, a portable dictionary of plants, their classification and uses. Edition 3. Cambridge University Press.