Tetsuo Michael Koyama

Machaerina rubiginosa, commonly known as soft twig rush, flat leaf twig rush or common twig rush, is a flowering plant in the sedge family, Cyperaceae, that is native to Asia and the Pacific.

Carex phyllocephala is a species of flowering plant in the sedge genus Carex, family Cyperaceae. It is native to southern China, and introduced to Japan. A variegated cultivar, 'Sparkler', is commercially available.

Carex montis-wutaii is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of China.

Carex graminiculmis is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of northern China.

Carex doisutepensis is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Asia from south-central China in the north to Thailand in the south.

Carex chinoi is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Japan. It was first described in 1957 by Jisaburo Ohwi in an article by Tetsuo Koyama .

Carex albidibasis is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Japan.

Machaerina juncea, commonly known as bare twig-rush or tussock swamp twig rush, is a sedge in the sedge family, Cyperaceae, that is native to Australia, New Zealand, and New Caledonia.

Machaerina insularis is a flowering plant in the sedge family. The specific epithet is the Latin insularis (growing on an island), alluding to its island home.

Baumea articulata, commonly known as jointed rush, is a sedge in the sedge family, Cyperaceae, that is native to Western Australia. The grass-like plant is rhizomatous and perennial, it typically grows to a height of 1 to 2.6 metres (3.3 to 8.5 ft). It blooms between September and December producing red-brown flowers on pendulous inflorescences. It is found around swamps and on the margins of lakes along coastal areas in the Mid West, Wheatbelt, Peel, South West, Great Southern and Goldfields-Esperance where it grows in damp black sandy soils.

Baumea arthrophylla (now known as Machaerina arthrophylla) is a flowering plant in the sedge family, Cyperaceae that is native to many states and territories of Australia. The grass-like plant is rhizomatous and perennial, with a tufted habit. It typically grows to a height of 0.35 to 1.2 metres (1.1 to 3.9 ft). It blooms between September and November producing brown flowers. It is found in winter wet depressions and around swamps and lakes along coastal areas in the Peel, South West, Great Southern and Goldfields-Esperance where it grows in damp to wet peaty-sand soils. Commonly confused

Cyperus szechuanensis is a species of sedge that is native to south central parts of China.

Carex liui is a perennial sedge of the Cyperaceae family that is native to south eastern China and Taiwan.

Carex himalaica is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Nepal.

Carex hemineuros is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Asia from Tibet in the north to Nepal in the south.

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Cyperus fulvoalbescens is a species of sedge that is native to southern parts of Vietnam.

Carex tokarensis is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Japan.

Carex thailandica is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Thailand and Myanmar.

Carex tenuior is a perennial sedge of the Cyperaceae family that is native to the Ryukyu Islands south of Japan.

Carex taprobanensis is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Sri Lanka.