Schoenus inconspicuus

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Schoenus inconspicuus
S inconspicuus habit-2.jpg
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Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Cyperaceae
Genus: Schoenus
Species:
S. inconspicuus
Binomial name
Schoenus inconspicuus
T.L.Elliott, Euston-Brown & Muasya
S inconspicuus-map.pdf
Documented collection localities in South Africa

Schoenus inconspicuus is a species of sedge endemic to south-western areas of the Western Cape Province of South Africa. [1]

Contents

Description

Schoenus inconspicuus has long, linear-lanceolate spikelets compared to other species of southern African Schoenus . [1] [2] [3] Among the southern African Schoenus, Schoenus ligulatus also has relatively long, linear-lanceolate spikelets; however, the spikelets of S. inconspicuus are longer (> 6.6 mm) compared to the shorter spikelets of S. ligulatus, which are often less than 5.7 mm. [1]

Furthermore, the spikelet glumes of S. inconspicuus are more paper-like, appearing silvery-white when young compared to those of S. ligulatus. [1] These paper-like glumes then deteriorate and shred with age in S. inconspicuus. [1] The lower spikelet glumes are also relatively long in length (often over half to 3/4 of the length of the spikelet) compared to those of S. ligulatus, which tend to be less than half of the length of the spikelet. [1] The glume mucros of S. ligulatus are more prominent compared to the poorly-formed or lacking glume mucros of S. inconspicuus. [1]

Habitat preferences differs notably between the two species, with Schoenus inconspicuus generally found on dry, acid sandy sites, while S. ligulatus is more common on wet sites. [1]

Taxonomy

Schoenus inconspicuus is a species in family Cyperaceae, tribe Schoeneae, which is a clade that includes genera such as Gahnia , Lepidosperma , Oreobolus , Costularia and Tetraria . [2] [4] [5] Based on morphological evidence, Schoenus inconspicuus is closely related to other southern African Schoenus species, specifically, species in the S. cuspidatus and allies group. [1] [2] [3]

Southern African Schoenus were once classified as Tetraria, but we currently know that the two groups are evolutionary distinct based on molecular and morphological differences. [6] To ensure that this group of sedges is monophyletic (i.e. the genus only has closely related species), several species of Epischoenus and the southern African Tetraria were transferred into Schoenus. [6] Two key differences between the two genera are that the southern African Schoenus do not have reticulate sheaths at the bases of the flowering stems and they lack the stem leaves that can be observed in Tetraria. [6]

Distribution and habitat

Schoenus inconspicuus has been reported recently from only a couple of locations: one on the Cape Peninsula and a second in the Overberg region of the Western Cape Province. [1] The preferred habitat of this species is rare acid sand flats, with an elevation range of between 14 and 250 m. [1]

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References

  1. 1 2 3 4 5 6 7 8 9 10 11 Elliott, T.L.; Euston-Brown, D.I.W.; Muasya, A.M. (2020). "Schoenus inconspicuus (Cyperaceae, tribe Schoeneae): a new species from Southern Africa". Phytotaxa. 440: 239–244. doi:10.11646/phytotaxa.440.3.6xa/article/view/phytotaxa.440.3.6.
  2. 1 2 3 Elliott, T.L.; Barrett, R.L.; Muasya, A.M. (2019). "A taxonomic revision of Schoenus cuspidatus and allies (Cyperaceae, tribe Schoeneae)—Part 1". South African Journal of Botany. 121: 519–535. doi: 10.1016/j.sajb.2018.11.021 .
  3. 1 2 Elliott, T.L.; Muasya, A.M. (2020). "A taxonomic revision of Schoenus cuspidatus and allies (Cyperaceae, tribe Schoeneae)—Part 2". South African Journal of Botany. 130: 327–347. doi: 10.1016/j.sajb.2019.12.015 .
  4. ↑ Viljoen, J.-A.; Muasya, A.M.; Barrett, R.L.; Bruhl, J.J.; Gibbs, A.K.; Slingsby, J.A.; Wilson, K. L.; Verboom, G.A. (2013). "Radiation and repeated transoceanic dispersal of Schoeneae (Cyperaceae) through the southern hemisphere". American Journal of Botany. 100 (12): 2494–2508. doi:10.3732/ajb.1300105.
  5. ↑ Larridon, I.; Bauters, K.; Semmouri, I.; Viljoen, J.-A.; Prychid, C.J.; Muasya, A.M.; Bruhl, J.J.; Wilson, K.L.; Senterre, B.; Goetghebeur, P. (2018). "Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages". Molecular Phylogenetics and Evolution. 126: 196–209. doi:10.1016/j.ympev.2018.04.016.
  6. 1 2 3 Elliott, T.L.; Muasya, A.M. (2017). "Taxonomic realignment in the southern African Tetraria (Cyperaceae, tribe Schoeneae; Schoenus clade)". South African Journal of Botany. 112: 354–360. doi: 10.1016/j.sajb.2017.06.011 .
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