Restionaceae
| Restionaceae Temporal range: Late Cretaceous-Recent, 66–0 Ma |
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| Elegia capensis | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| (unranked): | Commelinids |
| Order: | Poales |
| Family: |
Restionaceae R.Br. |
The Restionaceae, also called restiads and restios, are a family of annual or perennial rush-like flowering plants native to the Southern Hemisphere; they vary from a few centimeters to 3 m in height. Following the APG IV (2016): the family now includes the former families Anarthriaceae, Centrolepidaceae and Lyginiaceae, and as such includes 51 genera with 572 known species. Based on evidence from fossil pollens, the Restionaceae likely originated more than 65 million years ago during the Late Cretaceous period, when the southern continents were still part of Gondwana.
The family consists of tufted or rhizomatous, herbaceous plants, rush-like or bamboo-like in overall appearance. They belong to a group of monocotyledons that includes several similar families, such as the sedges, rushes, and true grasses. They have green, photosynthetic stems and leaves that have been reduced to sheaths. Their flowers are extremely small and in spikelets, which in turn make up the inflorescences. Male and female flowers are on separate plants and, like grasses, are wind-pollinated.
Plants in the family are distributed on all the southern continents - South America (1 sp., Apodasmia chilensis), Africa south of the Equator and including Madagascar (about 330 spp.) and Australia (about 150 spp.) - in New Zealand (four spp.) and widely distributed in Southeast Asia (one sp.). They are often dominant elements of the flora in the Mediterranean climates of South Africa and Western Australia. They are the defining family in the Western Cape fynbos plant community. The South American species is very similar to one of the New Zealand species, leading to the conjecture that it might have crossed the Pacific in the last 30 million years. The distribution of restios in Africa is irregular, with the same single species occurring in Madagascar, the Democratic Republic of the Congo, Tanzania, and Malawi, while a different species is found in the Chimanimani Mountains of eastern Zimbabwe. Four species are found in the Natal Drakensberg, one of which spills over into Mpumalanga and Limpopo provinces. The vast majority of species, though, are to be found in the Cape Floristic Region and particularly plentiful on hard sandstone formations. The center of diversity lies in the Kogelberg, where more than a third of all Restionaceae may be found. Restionacea can be found in Kirstenbosch, Cape Town's National Botanical Gardens.
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Wikipedia