Hugh Thomas O'Neill

Cyperus perennis is a species of sedge that is native to north western parts of Mexico.

Cyperus pennellii is a species of sedge that is native to southern parts of Mexico and northern parts of South America.

Cyperus lundellii is a species of sedge that is native to parts of southern parts of North America and parts of Central America.

Cyperus arsenei is a species of sedge that is native to parts of Mexico.

Cyperus antillanus is a species of sedge that is native to western and central parts of Cuba.

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Cladium californicum is a species of flowering plant in the sedge family known as California sawgrass. It is native to the southwestern United States and northern Mexico where it grows in moist areas in a number of habitat types, often in alkaline soils. Cladium californicum is a perennial herb with a hollow, erect, rounded stem 1–2 m (3 ft 3 in – 6 ft 7 in) tall. It grows from rhizomes in dense clumps. The narrow leaves are flat and edged with small, sharp teeth. The inflorescence is a large panicle of spikelets yielding oval-shaped, purplish-brown fruits.

Cyperus nudiceps is a species of flowering plant in the family Cyperaceae, only found on Cocos Island. It was first described as Kyllinga nudiceps in 1929 and transferred to Cyperus in 1944.

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