| Cyperus rigidellus | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Clade: | Commelinids |
| Order: | Poales |
| Family: | Cyperaceae |
| Genus: | Cyperus |
| Species: | C. rigidellus |
| Binomial name | |
| Cyperus rigidellus | |
| Synonyms [1] | |
| |
Cyperus rigidellus is a sedge of the family Cyperaceae that is native to Australia. [2]
The short-lived perennial or annual, herbaceous, grass-like sedge typically grows to a height of 5 to 40 centimetres (1.97 to 15.75 in). [2] The terete culms are three sided with sharp edges and concave sides and are often rough higher up. The culms are typically 3 to 25 cm (1.2 to 9.8 in) in length and have a diameter of 0.6 to 1.3 mm (0.024 to 0.051 in). The leaves are usually longer than the culms and often curly at the apex and have a width of around 3 mm (0.12 in). [3] It blooms between April and November producing brown-red flowers. [2] The head-like or simple inflorescence has one to four branches that 1 to 6 cm (0.39 to 2.36 in) in length. Each inflorescence is loosely or densely clustered with a globose shape and around 30 mm (1.2 in) in diameter. The flattened spikelets occur in clusters of 5 to 15 each containing 6 to 25 flowers. Each spikelet is 4 to 25 mm (0.16 to 0.98 in) in length and 2.5 to 4 mm (0.098 to 0.157 in) wide. After flowering trigonous pale brown nuts form with a narrow-obovoid to narrow-ellipsoid shape. [3]
The species was initially confused with Cyperus gilesii and C. enervis. [1] It was first formally described as a variety of C. gracilis by the botanist George Bentham in 1878 (as C. gracilis var. rigidellus). Charles Baron Clarke promoted it to the independent species Mariscus rigidellus in 1908, John McConnell Black moved it back to Cyperus in 1929 as part of the work Additions and Corrections as published in Flora of South Australia. There are several synonyms. [1] [4]
It is found in all mainland states and territories in Australia. [1] In Western Australia it is found along stream and creek, around clay pans, on flood plains and other damp areas in the Mid West, Pilbara, Gascoyne and Goldfields-Esperance regions where it grows in loamy-sand or clay-sand soils. [2] In New South Wales it is found in inland areas usually in ephemerally wet places including floodways and roadside drains. [3]
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.
Cyathochaeta is a genus of rhizomatous perennial sedges.
Cyperus alterniflorus, commonly known as umbrella flat-sedge, is a sedge of the family Cyperaceae that is native to Australia.
Cyperus betchei is a sedge of the family Cyperaceae that is native to Australia.
Cyperus concinnus is a sedge of the family Cyperaceae that is native to Australia, and found in New South Wales, Queensland, the Northern Territory, South Australia, Victoria and Western Australia.
Cyperus congestus, commonly known as dense flat-sedge or clustered flat-sedge, is a sedge of the family Cyperaceae that is native to southern Africa mostly in South Africa, Lesotho and Namibia.
Cyperus dactylotes is a sedge of the family Cyperaceae that is native to all of mainland Australia except for Victoria.
Cyperus digitatus, also known as finger flatsedge in the United States, and chang xiao sui suo cao in China, is a sedge of the family Cyperaceae that is native to tropical and subtropical areas of Africa, Asia, the Americas and Australia.
Cyperus flaccidus is a sedge of the family Cyperaceae that is native to Australia.
Cyperus gilesii, commonly known as Giles' flat-sedge, is a sedge of the Cyperaceae that is native to Australia.
Cyperus hamulosus is a sedge of the family Cyperaceae. It is native from Bulgaria east to Mongolia, and from Morocco in north Africa down to Namibia in the south. It has also been introduced to western parts of Australia.
Cyperus nutans is a sedge of the family Cyperaceae that is native to Australia, China, India, Bangladesh, south-east Asia, Malaysia, India, and Indonesia.
Cyperus pygmaeus, also known as dwarf flat sedge, is a sedge of the family Cyperaceae that is native to Australia.
Cyperus vaginatus, commonly known as stiff-leaf sedge or stiff flat-sedge, is a sedge of the family Cyperaceae that is native to Australia.
Cyperus victoriensis, also known as channel nut grass is a sedge of the family Cyperaceae that is native to all the states and territories of mainland Australia.
Cyperus viscidulus is a sedge of the family Cyperaceae that is native to north western Australia.
Cyperus vorsteri is a sedge of the family Cyperaceae native to southern Africa.
Eleocharis acuta, commonly known as common spikerush or small spikerush, is a sedge of the family Cyperaceae that is native to Australia.
Aristida contorta, commonly known as bunched kerosene grass, kerosene grass, bunched windgrass, silvergrass, mulga grass,sand speargrass, and medicine grass, is a species of grass in the family Poaceae that is native in Australia. The Walmajarri name for this species is Ngirrirli.
Rhynchospora inexpansa, commonly called nodding beaksedge, is a species of flowering plant in the sedge family (Cyperaceae). It is native to North America, where it is found in the southeastern United States and West Indies. Its typical natural habitat is in moist meadows, flatwoods, and pond edges. It is a weedy species that responds positively to ecological disturbance.