Schoenus selinae

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Schoenus selinae
Sselinae habit-NH-1.jpg
Auricle veldrush
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. selinae
Binomial name
Schoenus selinae
T.L.Elliott, Muthaphuli & Muasya
S selinae-map.pdf
Documented collection localities in South Africa

Schoenus selinae is a species of sedge endemic to the Western Cape Province and western areas of the Eastern Cape Province of South Africa. [1]

Contents

Description

Schoenus selinae is species with lateral papery extensions on its inflorescences (flowering stems), and it generally prefers wet mountainous habitats. [1] The inflorescences usually have more than one cluster of spikelets, but when it does have only one spikelet cluster, it can resemble Schoenus pictus . The main differences between the two species is that S. pictus has leaves that arise from the base of its stems, whereas S. selinae lacks this character. [1]

Schoenus pseudoloreus is a second species that resembles S. selinae, but the two differ in that S. pseudoloreus has leaves at the base of the stems, whereas the latter species lacks these leaves. [1]

Other closely related species that lack leaves at the base of their stems and resemble S. selinae are Schoenus lucidus and Schoenus neovillosus . [1] Whereas the culms and inflorescences of S. lucidus and S. neovillosus are partially hairy, S. selinae lacks hairs. [1] Furthermore, the inflorescence bracts of S. selinae have membranaceous paper-like extensions, which are lacking in the other two species. [1]

Similarities also exist between S. selinae and Schoenus rigidus , as both species have membranaceous paper-like extensions associated with their inflorescence bracts. [1] The shape of the inflorescence of S. rigidus is more branched with the paper-like extensions only at the base of the spikelet clusters, whereas these extensions are present along a greater portion of the inflorescence length in S. selinae. [1] In addition, the inflorescences of S. selinae appear more linear compared to the more branched ones of S. rigidus. [1]

Certain species of southern African Schoenus might form hybrids with each other, which partially explains the difficulties in identifying these species. [1] [2] Recent research shows that S. selinae is likely diploid and not of recent polyploid origin, but more study is needed to confirm this. [3]

Taxonomy

Schoenus selinae is a species in family Cyperaceae, tribe Schoeneae. [4] [5] [6] This tribe has other notable genera such as Costularia , Gahnia , Lepidosperma , Oreobolus and Tetraria . [5] Phylogenetic and morphological evidence suggests that the closest relatives to S. selinae are species in the Epischoenus group of Schoenus. [1]

The genus Tetraria once included species from the southern African Schoenus; however, we now know that the two groups are evolutionary distinct based on morphological and molecular differences. [7]

To ensure that Schoenus is monophyletic (i.e. the genus only has closely related species), several species of the southern African Tetraria and Epischoenus were transferred into Schoenus. [7] The main distinguishing traits between Tetraria and Schoenus in the field are the lack of stem leaves and absence of reticulate sheaths at the bases of the flowering stems in Schoenus. [7]

Distribution and habitat

The known distribution of S. selinae ranges from the Cederberg Mountains in the Western Cape Province to the Humansdorp region in the Eastern Cape Province of South Africa. [1] The known elevation range of this species is between 150 and 1700 metres, and it occurs generally on wet mountainous sites with a couple of collections made from forest margins. [1]

Related Research Articles

<i>Schoenus compar</i> Species of grass-like plant

Schoenus compar is a species of sedge endemic to southern South Africa.

<i>Schoenus arenicola</i> Species of grass-like plant

Schoenus arenicola is a species of sedge endemic to the south-west coast of South Africa.

<i>Schoenus pictus</i> Species of grass-like plant

Schoenus pictus is a species of sedge endemic to the Western Cape Province of South Africa. It is a species usually found on mountain slopes.

<i>Schoenus megacarpus</i> Species of grass-like plant

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<i>Schoenus auritus</i> Species of grass-like plant

Schoenus auritus is a species of sedge endemic to southern and eastern South Africa.

<i>Schoenus ligulatus</i> Species of grass-like plant

Schoenus ligulatus is a species of sedge endemic to the western regions of the Western Cape Province of South Africa.

<i>Schoenus submarginalis</i> Species of grass-like plant

Schoenus submarginalis is a species of sedge endemic to the mountains of the Western and Eastern Cape provinces of South Africa.

<i>Schoenus limosus</i> Species of grass-like plant

Schoenus limosus is a species of sedge endemic to the KwaZulu-Natal and Eastern Cape provinces of South Africa. It is predominantly a species of wet grasslands, which explains its common name.

<i>Schoenus bracteosus</i> Species of grass-like plant

Schoenus bracteosus is a species of sedge endemic to the mountains of southern South Africa.

<i>Schoenus adnatus</i> Species of grass-like plant

Schoenus adnatus is a species of sedge endemic to mountainous locations in southern regions of South Africa.

<i>Schoenus complanatus</i> Species of grass-like plant

Schoenus complanatus is a species of sedge endemic to the western mountains of the Western Cape Province of South Africa.

<i>Schoenus quadrangularis</i> Species of grass-like plant

Schoenus quadrangularis is a species of sedge endemic to mountainous of southern South Africa.

<i>Schoenus gracillimus</i> Species of grass-like plant

Schoenus gracillimus is a species of sedge endemic to the Western Cape Province of South Africa.

<i>Schoenus lucidus</i> Species of grass-like plant

Schoenus lucidus is a species of sedge endemic to the western mountains of the Western Cape Province of South Africa.

<i>Schoenus neovillosus</i> Species of grass-like plant

Schoenus neovillosus is a species of sedge endemic to the south-western mountains of the Western Cape Province of South Africa.

<i>Schoenus australis</i> Species of grass-like plant

Schoenus australis is a species of sedge endemic to locations near the southern coast of South Africa.

<i>Schoenus brunnescens</i> Species of grass-like plant

Schoenus brunnescens is a species of sedge endemic to the Western Cape Province of South Africa.

<i>Schoenus graciliculmis</i> Species of grass-like plant

Schoenus graciliculmis is a species of sedge endemic to regions of the southern Eastern Cape Province and nearby regions of the Western Cape Province of South Africa.

<i>Schoenus crinitus</i> Species of grass-like plant

Schoenus crinitus is a species of sedge endemic to the Worcester region of the Western Cape Province of South Africa.

<i>Schoenus rigidus</i> Species of grass-like plant

Schoenus rigidus is a species of sedge endemic to locations near central regions of the southern coast of South Africa.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Elliott, T.L.; Muasya, A.M. (2020). "A taxonomic revision of the Epischoenus group of Schoenus (Cyperaceae, tribe Schoeneae)". South African Journal of Botany. 135: 296–316. doi: 10.1016/j.sajb.2020.08.029 .
  2. ↑ Levyns, M. (1947). "Tetraria and related genera, with special reference to the flora of the Cape Peninsula". Journal of South African Botany. 13: 73–93.
  3. ↑ Elliott, T.L.; Muasya, A.M.; Bureš, P. (2022). "Complex patterns of ploidy in a holocentric plant clade (Schoenus, Cyperaceae) in the Cape biodiversity hotspot". Annals of Botany. doi:10.1016/10.1093/aob/mcac027.
  4. ↑ 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 .
  5. 1 2 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.
  6. ↑ 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.
  7. 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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