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Granite Cape Flax

Scientific Name
Polycarena silenoides Harv. ex Benth.
Higher Classification
Nycterinia selaginoides (Thunb.) Benth. var. parviflora Benth., Zaluzianskya selaginoides (Thunb.) Walp. var. parviflora (Benth.) Walp., Zaluzianskya villosa F.W.Schmidt var. parviflora (Benth.) Hiern in Fl. Cap. 4(2): 345 (1904), excluding all cited specimens (in part)
Common Names
Granite Cape Flax (e)
National Status
Status and Criteria
Critically Endangered B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)
Assessment Date
G. Laidler, D.A. Snijman & D. van der Colff
One small subpopulation (EOO 0.13 km², AOO <0.13 km²) is suspected to continue to decline due to ongoing competition from alien invasive plants.
South African endemic
Provincial distribution
Western Cape
Lion's Head, Cape Peninsula.
Habitat and Ecology
Major system
Major habitats
Peninsula Granite Fynbos
Granite slopes.
The only known population occurs within the Table Mountain National Park, but its habitat is infested with alien invasive grasses that are likely to outcompete native species. Alien grass infestations are extremely difficult to control, and stems from the reserve bordering on urban areas - a continuous source of exotic and invasive species entering indigenous fynbos vegetation. There is also ongoing degradation of granite fynbos on the slopes of Lion's Head due to too frequent fires, but it may not have such a severe impact on P. silenoides as it is an annual species.

Polycarena silenoides was previously known only from a small number of historical records, and has not been seen for more than 100 years. It was thought to be possibly extinct until targeted surveys relocated a population at the type locality in 2015. This species is most likely a fire ephemeral, as it was found following a fire, but then the population could not be relocated in the following year (G. Laidler pers. comm. 2016). About 20 plants were counted in 2015, but this species is very cryptic and easily overlooked among dense vegetation, and therefore the population size may be an underestimate. The population trend is not known at this stage, but is suspected to be either fluctuating or declining.

Population trend
Laidler, G., Snijman, D.A. & van der Colff, D. 2016. Polycarena silenoides Harv. ex Benth. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2019/12/06

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Distribution map

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