Oldenburgia grandis (Thunb.) Baill.
  • Hist. Pl. (Baillon) 8: 97


Cite taxon page as 'WFO (2020): Oldenburgia grandis (Thunb.) Baill. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000011999. Accessed on: 15 Jul 2020'

Diagnostic Description

The tree-like form, large leaves and capitula and glabrous achenes distinguish O. grandis from all other members of the genus.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 1
    • ]. 

    Morphology

    Shrub or small tree 1-5 m tall with gnarled, rough, dark stems and branches. Leaves obovate or oblanceolate with obtuse or subacute apices, range up to 200-100 mm. Peduncles to 500 mm, densely tomentose, bearing several leaf-like bracts and 3-5 cymosely arranged capitula. Involucre cyathiform range up to 80 x 80 mm. Involucral bracts numerous, about 10-seriate, narrowly lanceolate and closely imbricate, but with reflexed acuminate tips, 15-40 mm long, about 3 mm wide at base, dark maroon with white-tomentose bases. Ray florets about 60, sub-uniseriate, white, tube c. 15 mm long, outer lip 3-toothed, 16-22 mm long, 2 mm wide, inner lobes 11-15 mm long, 0.5-1 mm wide; anthers about 14 mm long, including 4 mm long tails; style up to 35 mm long; achenes fusiform, glabrous, 10-ribbed, 12-15 mm long,1.5-3 mm wide; pappus of about 18 barbellate bristles of uniform length and thickness, about 25 mm long. Disc florets about 800, white, tube 14-16 mm long, lobes 14-16 mm long; anthers 10-17 mm long, including 3-5-mm long tails, style 30-37 mm long; achenes as in ray florets except the pappus with 20-26 bristles about 30 mm long.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 1
    • ]. 

    Habitat

    Oldenburgia grandis is always associated with outcrops of Witteberg quartzite and in an area which receives most of its annual precipitation (approx. 600 mm) in summer.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 1
    • ]. 

    Distribution

    Eastern Cape extending along the Suurberge near Somerset East to about 22 km east of Grahamstown - a range of some 200 km.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 1
    • ]. 

      Bibliography

    • 1 Bond, P. 1987. A revision of Oldenburgia (Asteraceae - Mutisieae). S. African J. Bot. 53: 493 - 500.
    • 2 Hist. Pl. (Baillon) 8: 97

     Information From

    Compositae
    CC0 1.0 Universal (CC0 1.0). https://creativecommons.org/publicdomain/zero/1.0
    • A CC0 1.0 Universal (CC0 1.0).
    e-Flora of South Africa
    e-Flora of South Africa. v1.21. 2018. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.21
    • B All Rights Reserved
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).
    Global Tree Assessment
    http://www.bgci.org/
    BGCI. 2018. GlobalTreeSearch online database. Botanic Gardens Conservation International. Richmond, U.K. Available at www.bgci.org. Accessed on 30/11/2018.
    • D Botanic Gardens Conservation International
    International Union for Conservation of Nature v.3
    https://www.iucnredlist.org/
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • E See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use
    International Union for Conservation of Nature
    https://www.iucn.org/
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • F All Rights Reserved