Carex rainbowii

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Carex rainbowii
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Cyperaceae
Genus: Carex
Section: Carex sect. Sylvaticae
Species:
C. rainbowii
Binomial name
Carex rainbowii
Luceño, Jim.Mejías, M. Escudero & Martín-Bravo

Carex rainbowii is a species of sedge found in the understorey of Afromontane forests in the Drakensberg Mountains of South Africa. It had previously been misidentified as introduced populations of Carex sylvatica , but was published as a new species in 2013.

Contents

Description

Carex rainbowii forms tussocks, with stems 45–71 centimetres (18–28 in) high. [1] The leaves are usually slightly shorter than the stems, and are 6–10 mm (0.24–0.39 in) wide. The inflorescence is 18–35 cm (7–14 in) long, and consists of four or five lateral spikes of female flowers and a terminal spike. The terminal spike is sometimes made up of only male flowers, but is typically androgynecandrous (with male flowers at the tip and the base, but female flowers in between). [1] The lowest bract subtending the inflorescence is about the same length as the inflorescence. [1]

Carex rainbowii resembles the other species in Carex sect. Sylvaticae; compared to C. sylvatica , it has denser female spikes, and is distinguished by its hyaline female glumes and the fact that the uppermost spike is often androgynecandrous. [1]

Distribution and ecology

Afromontane vegetation, including a Podocarpus latifolius tree Podocarpus latifolius Real yellowwood tree South Africa 3.JPG
Afromontane vegetation, including a Podocarpus latifolius tree

Carex rainbowii is only known from two sites in the Drakensberg Mountains of uThukela District (KwaZulu-Natal, South Africa), at elevations of 1,500–1,700 metres (4,900–5,600 ft). It grows in the understorey of Afromontane forests dominated by Podocarpus latifolius and Carissa bispinosa , alongside Celtis africana , Carex spicato-paniculata , Schoenoxiphium lehmannii , Dietes iridioides and Blechnum giganteum . A further population may occur in Eastern Cape Province, but this is yet to be confirmed. [1]

Taxonomy

Carex rainbowii was described in 2013 by a group of Spanish botanists, having previously been considered an introduced population of Carex sylvatica . The specific epithet rainbowii denotes Rainbow Gorge, where the type material was collected, and also refers to South Africa's nickname the "Rainbow Nation", and to the rainbow as a symbol of peace and freedom. The new species was placed in a section of the genus Carex that previously contained only northern temperate taxa (C. sylvatica, C. arnellii , C. bostrychostigma , C. hondoensis , C. hypaneura and C. strigosa ). [1]

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<i>Carex hirta</i> Species of grass-like plant

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Carex binervis, the green-ribbed sedge, is a European species of sedge with an Atlantic distribution. It is found from Fennoscandia to the Iberian Peninsula, and occurs in heaths, moorland and other damp, acidic environments. It typically grows to a height of 15–120 cm (6–50 in), and has inflorescences comprising one male and several female spikes, each up to 45 mm (1.8 in) long. The utricles have two conspicuous green veins, which give rise to both the scientific name and the common name of the species. In the vegetative state, it closely resembles C. bigelowii, a species that usually grows at higher altitude. C. binervis was first described by James Edward Smith in 1800, and is classified in Carex sect. Spirostachyae; several hybrids with other Carex species are known.

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Carex sylvatica is a species of sedge found in deciduous woodlands across Europe. It typically reaches 60 cm (24 in) tall, and has an inflorescence made up of 3–5 pendent female spikes and a single male spike. It is also used as a garden plant, and has been introduced to North America and New Zealand.

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References

  1. 1 2 3 4 5 6 S. Martín-Bravo; M. Escudero; M. Miguez; P. Jiménez-Mejías; M. Luceño (2013). "Molecular and morphological evidence for a new species from South Africa: Carex rainbowii (Cyperaceae)". South African Journal of Botany . 87: 85–91. doi: 10.1016/j.sajb.2013.03.014 .