Othonna dentata

L.

Family: Asteraceae
Common names:
none known

In flower


This blue-grey succulent shrublet is ideally suited to coastal gardens and deserves to be more popular with gardeners. 

Description
This succulent shrublet with a fleshy caudex (short, thickened perennial stem) grows up to 700 mm. It is often much shorter when growing close to the high-water mark. The blue-grey hairless leaves are obovate to oblanceolate and borne towards the tips of the branches. Leaves are 37.0–50.0 ×18.5–25.0 mm and without distinct leaf stalks. The red leaf margins vary from finely to coarsely toothed.

Leaves

The single yellow flowerheads of about 20 mm across appear at the end of the naked stem. Flowers are also characterised by a single row of more or less united involucral bracts (bracts surrounding the base of a flowerhead). Flowering time is from June to December.

Conservation status
Othonna dentata has a Red List status of Least Concern (LC).

Distribution and habitat
This species is common on inland mountains as well as rocky outcrops and sandy areas of coastal areas from the Cape Peninsula to Still Bay in the Western Cape. With its habitat so close to the sea, it is rarely exposed to drastic temperature differences. Along the coastal strips, plants are often exposed to rather windy conditions and salt-laden sea breezes. Frost is seldom experienced in its distribution area. Plants are often much shorter when growing close to the high-water mark.

Growing in rocky crevice at Kleinmond

Derivation of name and historical aspects
The genus name Othonna is derived from the ancient Greek name othonne, meaning ‘linen' or ‘cloth' and could refer to the soft texture of some of the leaves. The specific epithet dentata refers to the toothed leaves of the species.
The genus Othonna, also known as bobbejaankool in Afrikaans, consists of about 140 species that are found from the Western Cape northeast to KwaZulu-Natal and north to Namibia.

Ecology
Within its natural environment, Othonna dentata is usually found growing with Coleonema album, Aloe succotrina, Sideroxylon inerme , Berkheya barbata, Cotyledon orbicularis, Crassula rupestris var. rupestris, Delosperma littorale, Pelargonium cucculatum, Ruschia macowanii and Curio crassulifolius.

Uses and cultural aspects
None recorded. However, this species is a very interesting garden or pot subject.

Shrub in flower

Growing Othonna dentata

This species is easily grown from cuttings. Take cuttings anytime of the year and apply rooting hormone to stimulate rooting. Use a well-drained medium like coarse river sand. Place in a cool, well-ventilated area or cold frame away from direct sunlight. Pot rooted cuttings into a well-drained potting soil. Germination success from seed is unknown but since it is a winter-rainfall species, it is probably best sown during autumn.

It should be a useful addition to rockeries, coastal gardens, and sloped sections in a garden, or make for an exciting pot plant with its striking blue-grey foliage. Provided that there is ample drainage, it could also be used level areas. In frost-prone areas, it is best displayed in a pot on a sunny patio or glasshouse.

This floriferous shrublet is relatively pest-free.

References and further reading

  • Bean, A. & Johns, A. 2005. Stellenbosch to Hermanus. South African Wild Flower Guide 5, edn 2. Botanical Society of South Africa, Cape Town.
  • Goldblatt, P. & Manning, J. 2000. Cape Plants. A conspectus of the Cape flora of South Africa. Strelitzia 9. National Botanical Institute, Pretoria & Missouri Botanical Garden, Missouri.
  • Mustart, P., Cowling, R. & Albertyn, J. 1997. Southern Overberg. South African Wild Flower Guide 8, edn 1. Botanical Society of South Africa, Cape Town.
  • Raimondo, D., Von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. & Manyama, P.A. (eds). Red List of South African plants 2009. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
  • Smith, G.F & Crouch, N.R. 2009. Guide to succulents of Southern Africa . Struik Nature, Cape Town.
  • Stearn, W. 2002. Stearn's dictionary of plant names for gardeners . Timber Press, Portland.

 

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Kirstenbosch National Botanical Garden

October 2013

To find out if SANBI has seed of this or other SA species, please email our seedroom.
This page forms part of the South African National Biodiversity Institute's plant information website www.plantzafrica.com

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