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Osteospermum

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Osteospermum
Osteospermum spinosum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Calenduleae
Genus: Osteospermum
L.
Type species
Osteospermum spinosum
(L.)
Species

See text

Synonyms[1]
  • Chrysanthemoides Fabr. (1759)
  • Eriocline Cass. (1819)
  • Inuloides B.Nord. (2006)
  • Lepisiphon Turcz. (1851)
  • Monilifera Adans. (1763), nom. superfl.
  • Monoculus B.Nord. (2006)
  • Nephrotheca B.Nord. & Källersjö (2006)
  • Norlindhia B.Nord. (2006)
  • Oligocarpus Less. (1832)
  • Tripterachaenium Kuntze (1898)
  • Tripteris Less. (1831)
  • Xenismia DC. (1836)

Osteospermum /ˌɒstiəˈspɜːrməm, -tioʊ-/,[2][3] is a genus of flowering plants belonging to the Calenduleae, one of the smaller tribes of the sunflower/daisy family Asteraceae.[4] They are known as the daisybushes[5] or African daisies.[6] Its species have been given several common names, including African daisy, South African daisy, Cape daisy and blue-eyed daisy.

In horticulture, several widely cultivated species continue to be sold, grown and referred to as Osteospermum, however some of these species have been scientifically reclassified as being members of the genus Dimorphotheca, including Dimorphotheca barberae (synonym Osteospermum barberae);[7] Dimorphotheca ecklonis (synonym Osteospermum ecklonis),[8][9] Dimorphotheca fruticosa (synonym Osteospermum fruticosum);[10][11] and Dimorphotheca jucunda (synonym Osteospermum jucundum).[12][13]

Description

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Their alternate (rarely opposite) leaves are green, but some variegated forms exist. The leaf form is lanceolate. The leaf margin is entire, but hardy types are toothed.

The daisy-like composite flower consists of disc florets and ray florets, growing singly at the end of branches or sometimes in inflorescences of terminal corymbose cymes. The disc florets are pseudo-bisexual and come in several colors such as blue, yellow and purple. The hardy types usually show a dark blue center in the disc until the yellow pollen is shed. The ray florets are female and are found diverse colors such as white, cream, pink, purple, mauve to yellow. Some cultivars have "spooned" petals such as "Pink Whirls".[14] Many species flower a second time late summer, stimulated by the cooler night temperatures. Hardy types show profuse flowering in the spring, but they do not get a second flush of flowers.

Taxonomy

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The genus Osteospermum was named by Carl Linnaeus in 1753. The scientific name is derived from the Greek osteon (bone) and Latin spermum (seed). Plants of the World Online and the South African National Biodiversity Institute accept a broad definition of the genus, which is a sister taxon to Dimorphotheca. Other authorities treat its generic synonyms (Chrysanthemoides, Oligocarpus, etc.) as separate genera.[1][15]

Species

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74 species are accepted:[1]

Formerly placed here

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Distribution

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There are about 70 species native to southern and eastern Africa and the Arabian peninsula.[1]

Cultivation

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Osteospermum are popular in cultivation, where they are frequently used in summer bedding schemes in parks and gardens. Numerous hybrids and cultivars have been grown with a wide range of tropical colors. Yellow cultivars tend to have a yellow center (sometimes off-white).

Plants prefer a warm and sunny position and rich soil, although they tolerate poor soil, salt or drought well. Modern cultivars flower continuously when watered and fertilised well, and dead-heading is not necessary, because they do not set seed easily. If planted in a container, soil should be prevented from drying out completely. If they do, the plants will go into "sleep mode" and survive the period of drought, but they will abort their flower buds and not easily come back into flower. Moreover, roots are relatively susceptible to rotting if watered too profusely after the dry period.

Cultivars

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Most widely sold cultivars are grown as annuals, are mainly hybrids of O. jucundum, O. ecklonis and O. grandiflorum and can be hardy to -2 °C (30 °F). If hardy, they can be grown as perennials or as shrubs.

Cultivars (those marked agm have gained the Royal Horticultural Society's Award of Garden Merit):[16]

'White Spoon'
  • 'Acapulco'
  • 'African Queen'
  • 'Apricot'
  • 'Biera'
  • 'Big Pink'
  • 'Blackthorn Seedling' agm[17]
  • 'Bodegas Pink'
  • 'Buttermilk' agm[18]
  • 'Chris Brickell'
  • 'Duet'
  • 'Giles Gilbey'
  • 'Hopleys' agm[19]
  • 'Ice White'
  • 'Langtrees agm[20]
  • 'Lady Leitrim' agm[21]
  • 'Lilac Spoon'
  • 'Marbella'
  • 'Merriments Joy'
  • 'Nairobi Purple'
  • O. jucundum agm[22]
  • 'Passion Mix'
  • 'Pink'
  • 'Pink Beauty'
  • 'Pink Whirls' agm[23]
  • 'Silver Sparkler' agm[24]
  • 'Soprano'
  • 'Starshine'
  • 'Springstar Gemma'
  • 'Sunkist'
  • 'Weetwood' [25]
  • 'White Pim' agm[26]
  • 'White Spoon'
  • 'White Whirls'
  • 'Whirlygig'
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  • Osteospermum tomentosum
    Osteospermum tomentosum
  • 'Passion Mix'
    'Passion Mix'
  • 'Lemon Symphony' (an annual cultivar)
    'Lemon Symphony' (an annual cultivar)
  • Osteospermum 'Sunadora Hotspots Marbella', a modern hybrid
    Osteospermum 'Sunadora Hotspots Marbella', a modern hybrid
  • Osteospermum 'Sunadora Hotspots Acapulco', another modern hybrid
    Osteospermum 'Sunadora Hotspots Acapulco', another modern hybrid
  • An osteospermum displayed as part of the 2008 Penn State horticultural trials
    An osteospermum displayed as part of the 2008 Penn State horticultural trials
  • Osteospermum 'Pink Whirls'
    Osteospermum 'Pink Whirls'
  • 'Pink Whirls' close-up
    'Pink Whirls' close-up
  • Osteospermum Cape Daisy 'Pink bicolor'
    Osteospermum Cape Daisy 'Pink bicolor'
  • Osteospermum Sunset shades
    Osteospermum Sunset shades

References

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  1. ^ a b c d "Osteospermum L." Plants of the World Online. Royal Botanic Gardens, Kew. Archived from the original on 2020-08-15. Retrieved 2020-07-19.
  2. ^ "Osteospermum". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2022-08-27.
  3. ^ Sunset Western Garden Book, 1995:606–607
  4. ^ Wood, A.R.; Nordenstam, B. (December 2003). "An interesting new species of Osteospermum (Asteraceae–Calenduleae) from the Western Cape Province, South Africa, providing a link to the genus Chrysanthemoides". South African Journal of Botany. 69 (4): 572–578. doi:10.1016/S0254-6299(15)30297-0.
  5. ^ NRCS. "Osteospermum". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 26 July 2015.
  6. ^ Rhoades, Heather (28 June 2021). "Growing Osteospermum: How To Care For African Daisies". Gardening Know How. Archived from the original on 1 February 2022. Retrieved 1 February 2022.
  7. ^ "Dimorphotheca barberae Harv. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2024-10-03.
  8. ^ "Osteospermum ecklonis | deep purple African daisy Shrubs/RHS". www.rhs.org.uk. Retrieved 2024-10-03.
  9. ^ "Dimorphotheca ecklonis DC. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2024-10-03.
  10. ^ "Dimorphotheca fruticosa (L.) DC. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2024-10-03.
  11. ^ "Osteospermum fruticosum | trailing African daisy Annual Biennial/RHS". www.rhs.org.uk. Retrieved 2024-10-03.
  12. ^ "Osteospermum jucundum | delightful African daisy Herbaceous Perennial/RHS". www.rhs.org.uk. Retrieved 2024-10-03.
  13. ^ "Dimorphotheca jucunda E.Phillips | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2024-10-03.
  14. ^ The Garden. Vol. 122. Royal Horticultural Society. 1997. p. 510. Archived from the original on 2022-10-03. Retrieved 2022-02-05.
  15. ^ Wessel Swanpoel, Vera de Cauwer and Abraham E. Van Wyk (2020) A new species of Osteospermum subgen. Tripteris (Asteraceae: Calenduleae) from the Namib Desert, Namibia. Phytotaxa 487 (3): 185–194 26 February 2021. https://doi.org/10.11646/phytotaxa.487.3.1
  16. ^ "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 70. Archived (PDF) from the original on 5 January 2018. Retrieved 14 April 2018.
  17. ^ "RHS Plantfinder - Osteospermum 'Blackthorn Seedling'". Archived from the original on 17 April 2018. Retrieved 14 April 2018.
  18. ^ "RHS Plant Selector - Osteospermum 'Buttermilk'". Archived from the original on 28 January 2021. Retrieved 16 January 2021.
  19. ^ "RHS Plant Selector - Osteospermum 'Hopleys'". Archived from the original on 28 January 2021. Retrieved 16 January 2021.
  20. ^ "RHS Plant Selector - Osteospermum jucundum 'Langtrees'". Retrieved 28 June 2013.
  21. ^ "RHS Plantfinder - Osteospermum 'Lady Leitrim'". Archived from the original on 17 April 2018. Retrieved 14 April 2018.
  22. ^ "Osteospermum jucundum". RHS. Archived from the original on 28 January 2021. Retrieved 18 January 2021.
  23. ^ "RHS Plant Selector - Osteospermum 'Pink Whirls'". Archived from the original on 29 January 2021. Retrieved 16 January 2021.
  24. ^ "RHS Plantfinder - Osteospermum 'Silver Sparkler'". Archived from the original on 17 April 2018. Retrieved 14 April 2018.
  25. ^ "Osteospermum 'Weetwood'". RHS. Archived from the original on 29 January 2021. Retrieved 18 January 2021.
  26. ^ "RHS Plant Selector - Osteospermum 'White Pim'". Archived from the original on 28 January 2021. Retrieved 16 January 2021.

Further reading

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Media related to Osteospermum at Wikimedia Commons

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