A record, for posterity, of the floristic composition of strandveld at Kommetjie-Scarborough, Cape Peninsula, Western Cape, South Africa

@tonyrebelo @jeremygilmore @troos @botaneek @vynbos @daverichardson @yvettevanwijk1941 @cmerry @rion_c @dianastuder @sedgesrock @charles_stirton @kenneth_oberlander

I have before me an unpublished report, about 30 years old, written by D M Mann, then a student at the University of Cape Town (https://en.wikipedia.org/wiki/University_of_Cape_Town).

It is titled 'Dynamic dune communities: their structure and the threats that face them', and documents the flora of certain small, coastal remnants of indigenous vegetation on the outskirts of the metropolitan area of Cape Town (https://en.wikipedia.org/wiki/Cape_Town).

The following show the general scenery:
https://www.gettyimages.co.uk/detail/photo/long-beach-with-the-village-kommetjie-in-the-royalty-free-image/1033726788?adppopup=true
https://en.wikipedia.org/wiki/Scarborough,_Western_Cape#/media/File:Scarborough_Western_Cape_Coastline_and_City_View.jpg

At the time, these remnants were beset by several degrading influences, particularly

However, the vegetation remained intact enough that D M Mann was able to find a total of 27 sample plots (each 5 m X 10 m), in which to record the composition of the undisturbed vegetation, naturally exempt from wildfire, called 'strandveld' (https://en.wikipedia.org/wiki/Cape_Flats_Dune_Strandveld#:~:text=Wolfgat%20Nature%20Reserve-,Flora,Olifantsbos%2C%20Macassar%20and%20Gordons%20Bay.).

My interest in what might otherwise be forgotten as merely a small, unpublished study is based on the following perspective.

Unlike fynbos (https://en.wikipedia.org/wiki/Fynbos), which is ecologically fragile, strandveld is arguably resilient from various forms of disturbance. Therefore, strandveld may have long-term prospects for conservation in suburban settings. Even the problem of usurpation by Australian acacias may, in time, tend to resolve itself as the introduced plants integrate into the flora and become increasingly subject to damage by invertebrates.

Therefore, it may prove valuable to have a permanent record of the original floristic composition.

The study area was the coastal strip between Kommetjie (https://en.wikipedia.org/wiki/Kommetjie) and Scarborough (https://en.wikipedia.org/wiki/Scarborough,_Western_Cape), including

The substrate in the sample-plots is sand, derived from the beach rather than sandstone. This sand is partly calcareous, containing calcitic grains derived from the fragmented shells of marine organisms. The pH varied from 8 (alkaline) to 7 (neutral, where organic matter has accumulated under large, clonal shrubs of Sideroxylon inerme).

The strandveld sampled ranged from stands of low shrubs, including littoral elements associated with the edge of the beach, to stands of S. inerme, in which there were few additional plant species other than the liane Cynanchum obtusifolium (https://www.inaturalist.org/observations/36974049) - which in the study area occurred exclusively on S. inerme.

D M Mann recorded the cover-abundance of each species in each of the sample plots, according to the percentage categories used in the Braun-Blanquet system (https://link.springer.com/article/10.1007/bf01866672). However, I will not attempt to report the data here, at that level of detail.

RESULTS

Taking all of the sample plots collectively, the indigenous flora was as follows.

AIZOACEAE
Carpobrotus edulis (https://www.inaturalist.org/taxa/49322-Carpobrotus-edulis)
Jordaaniella dubia (https://www.inaturalist.org/taxa/532788-Jordaaniella-dubia)
Ruschia macowanii (https://www.inaturalist.org/taxa/491674-Ruschia-macowanii)
Tetragonia fruticosa (https://www.inaturalist.org/taxa/528778-Tetragonia-fruticosa)

AMARYLLIDACEAE
Brunsvigia orientalis (https://www.inaturalist.org/taxa/132796-Brunsvigia-orientalis)

ANACARDIACEAE
Searsia glauca (https://www.inaturalist.org/taxa/564119-Searsia-glauca)
Searsia laevigata (https://www.inaturalist.org/taxa/493489-Searsia-laevigata)
Searsia lucida (https://www.inaturalist.org/taxa/593894-Searsia-lucida)

ASCLEPIADACEAE
Cynanchum africanum (https://www.inaturalist.org/taxa/119577-Cynanchum-africanum)
Cynanchum obtusifolium (https://www.inaturalist.org/taxa/583200-Cynanchum-obtusifolium)

ASPARAGACEAE
Asparagus aethiopicus (https://www.inaturalist.org/taxa/75603-Asparagus-aethiopicus)
Asparagus lignosus (https://www.inaturalist.org/taxa/505800-Asparagus-lignosus)

ASTERACEAE
Osteospermum incanum (https://www.inaturalist.org/taxa/596722-Osteospermum-incanum)
Osteospermum moniliferum (https://www.inaturalist.org/taxa/404420-Osteospermum-moniliferum)
Chrysocoma coma-aurea (https://www.inaturalist.org/taxa/129068-Chrysocoma-coma-aurea)
Cinereria geifolia (https://www.inaturalist.org/taxa/582265-Cineraria-geifolia)
Eriocephalus africanus (https://www.inaturalist.org/taxa/430981-Eriocephalus-africanus)
Helichrysum crispum (https://www.inaturalist.org/taxa/586894-Helichrysum-crispum)
Helichrysum dasyanthum (https://www.inaturalist.org/taxa/545839-Helichrysum-dasyanthum)
Helichrysum litorale (https://www.inaturalist.org/taxa/570762-Helichrysum-litorale)
Helichrysum niveum (https://www.inaturalist.org/taxa/586980-Helichrysum-niveum)
Ifloga repens (https://www.inaturalist.org/taxa/1391564-Ifloga-repens)
Metalasia muricata (https://www.inaturalist.org/taxa/527592-Metalasia-muricata)
Othonna coronopifolia (https://www.inaturalist.org/taxa/591071-Othonna-coronopifolia)
Senecio elegans (https://www.inaturalist.org/taxa/79044-Senecio-elegans)
Senecio arniciflorus (https://www.inaturalist.org/taxa/594188-Senecio-arniciflorus)

CAMPANULACEAE
Wahlenbergia tenella (https://www.inaturalist.org/taxa/596191-Wahlenbergia-tenella)

CELASTRACEAE
Cassine peragua (https://www.inaturalist.org/taxa/527633-Cassine-peragua)
Gymnosporia buxifolia (https://www.inaturalist.org/taxa/586670-Gymnosporia-buxifolia)
Pterocelastrus tricuspidatus (https://www.inaturalist.org/taxa/526208-Pterocelastrus-tricuspidatus)
Robsonodendron maritimum (https://www.inaturalist.org/taxa/593220-Robsonodendron-maritimum)

CRASSULACEAE
Cotyledon orbiculata (https://www.inaturalist.org/taxa/76462-Cotyledon-orbiculata)
Crassula tetragona (https://www.inaturalist.org/taxa/76467-Crassula-tetragona)

CUCURBITACEAE
Kedrostis nana (https://www.inaturalist.org/taxa/431200-Kedrostis-nana)

CYPERACEAE
Ficinia filiformis (https://www.inaturalist.org/taxa/585915-Ficinia-filiformis)
Ficinia ramosissima (https://www.inaturalist.org/taxa/569401-Ficinia-ramosissima)
Ficinia trichodes (https://www.inaturalist.org/taxa/585949-Ficinia-trichodes)
Schoenus cuspidatus (https://www.inaturalist.org/taxa/894562-Schoenus-cuspidatus)
Tetraria capillacea (https://www.inaturalist.org/taxa/595254-Tetraria-capillacea)

EBENACEAE
Euclea racemosa (https://www.inaturalist.org/taxa/526223-Euclea-racemosa)

GENTIANACEAE
Chironia baccifera (https://www.inaturalist.org/taxa/426224-Chironia-baccifera)

FABACEAE
Aspalathus hispida (https://www.inaturalist.org/taxa/580489-Aspalathus-hispida)
Indigofera brachystachya (https://www.inaturalist.org/taxa/587756-Indigofera-brachystachya)
Psoralea fruticans (https://www.inaturalist.org/taxa/1434303-Psoralea-fruticans)

LAMIACEAE
Salvia aurea (https://www.inaturalist.org/taxa/380967-Salvia-aurea)

LAURACEAE
Cassytha ciliolata (https://www.inaturalist.org/taxa/461729-Cassytha-ciliolata)

MYRICACEAE
Myrica cordifolia (https://www.inaturalist.org/taxa/527591-Morella-cordifolia)

MYRSINACEAE
Myrsine africana (https://www.inaturalist.org/taxa/70260-Myrsine-africana)

OLEACEAE

Chionanthus foveolatus (https://www.inaturalist.org/taxa/582167-Chionanthus-foveolatus)
Olea exasperata (https://www.inaturalist.org/taxa/578517-Olea-exasperata)

PLUMBAGINACEAE
Limonium scabrum (https://www.inaturalist.org/taxa/426220-Limonium-scabrum)

POACEAE
Ehrharta villosa (https://www.inaturalist.org/taxa/409471-Ehrharta-villosa)
Pentameris barbata (https://www.inaturalist.org/taxa/591740-Pentameris-barbata)
Tribolium hispidum (https://www.inaturalist.org/taxa/595630-Tribolium-hispidum)

POLYGALACEAE
Muraltia spinosa (https://www.inaturalist.org/taxa/526214-Muraltia-spinosa)
Polygala myrtifolia (https://www.inaturalist.org/taxa/181610-Polygala-myrtifolia)

RANUNCULACEAE
Knowltonia capensis (https://www.inaturalist.org/taxa/568954-Knowltonia-capensis)

RESTIONACEAE
Restio eleocharis (https://www.inaturalist.org/taxa/527597-Restio-eleocharis)
Restio leptoclados (https://www.inaturalist.org/taxa/703947-Restio-leptoclados)

RHAMNACEAE
Phylica ericoides (https://www.inaturalist.org/taxa/470408-Phylica-ericoides)

ROSACEAE
Cliffortia obcordata (https://www.inaturalist.org/taxa/582413-Cliffortia-obcordata)

RUBIACEAE
Galium tomentosum (https://www.inaturalist.org/taxa/586115-Galium-tomentosum)

RUTACEAE
Agathosma imbricata (https://www.inaturalist.org/taxa/568505-Agathosma-imbricata)

SANTALACEAE
Colpoon compressum (https://www.inaturalist.org/taxa/527438-Colpoon-compressum)
Thesium fragile (https://www.inaturalist.org/taxa/1180365-Thesium-fragile)

SAPOTACEAE
Sideroxylon inerme (https://www.inaturalist.org/taxa/362175-Sideroxylon-inerme)

SCROPHULARIACEAE
Chaenostoma hispidum (https://www.inaturalist.org/taxa/570499-Chaenostoma-hispidum)
Lyperia tristis (https://www.inaturalist.org/taxa/589507-Lyperia-tristis)

THYMELAEACEAE
Passerina paleacea (https://www.inaturalist.org/taxa/591427-Passerina-paleacea)

VISCACEAE
Viscum capense (https://www.inaturalist.org/taxa/119585-Viscum-capense)

ZYGOPHYLLACEAE
Roepera flexuosa (https://www.inaturalist.org/taxa/560274-Roepera-flexuosa)

Posted on October 07, 2023 01:57 AM by milewski milewski

Comments

Interesting. We walked that stretch (again)
https://www.inaturalist.org/calendar/dianastuder/2023/9/13
We were looking for Ferraria - which isn't on that list.

Posted by dianastuder 10 months ago

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