Geranium robustum Kuntze
  • Revis. Gen. Pl.


Cite taxon page as 'WFO (2020): Geranium robustum Kuntze. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000701251. Accessed on: 14 Jul 2020'

Diagnostic Description

It is a very distinctive plant, yet it is frequently misidentified as either G. incanum, G. canescens, or G. harveyi, none of which is shrubby, and all differ further from G. robustum in other characters. Geranium robustum is allied to G. pulchrum, which replaces it on the Natal side of the Drakensberg, though G. pulchrum possibly demands wetter sites than G. robustum.

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

    Morphology

    Robust subshrub up to elm high, stems one or several from the base, becoming bare and woody there, up to ±8 mm diam., silky canescent and leafy above, erect. Stipules deeply dissected, segments linear-acuminate. Leaves all cauline, all but the uppermost petioles 2-3 times as long as the blade, with white retrorse appressed hairs, blade up to 50(-100) mm in diam., digitately (3-)5(-7)-lobed to the base, each lobe elliptic-lanceolate in outline, twice pinnatifid, the ultimate segments lanceolate, entire or with an occasional tooth, upper surface with silky silvery appressed hairs, lower thickly silvery tomentose, the hairs all of similar length. Peduncles terminal and opposite the uppermost, reduced, leaves, forming small almost leafless compound cymes clad in fine retrorse appressed hairs, spreading gland-tipped hairs often present as well; ultimate peduncles mostly 2-flowered. Pedicels up to ±60 mm long, with fine appressed retrorse hairs as well as few to many spreading gland-tipped ones. Sepals (6-)7-9 x 2.5-3.5(-4) mm, ± appressed pubescent, often with long spreading gland-tipped hairs as well. Petals (13-)18-20 x 11-12(-15) mm,obovate, shallowly notched, light purple. Rostrum with short fine spreading pubescence, often with long spreading gland-tipped hairs as well.

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

    Dwarf shrub, 0.2-1.8 m high; robust. Stems erect, silky canescent and leafy above. Leaves all cauline, silvery, twice pinnatifid; blade up to 50-100 mm in diameter, segments narrowly ovate, margins entire, occasional toothed, upper surface with silvery appressed hairs, lower surface thick silvery tomentose; petioles 2-3 x longer than blade. Flowers: inflorescence usually 2-flowered; peduncles opposite on upper surface and terminal, pedicels up to 60 mm long, with fine appressed retrorse hairs and few to many, spreading, gland-tipped ones; petals 13-20 x 11-15 mm, light purple; Nov.-Mar.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 2
    • ]. 

    Habitat

    It grows in damp or marshy ground along streams and in drainage lines. Geranium robustum favours streamsides and moist, shrub-covered mountain slopes between 1600 and 2590 m above sea level. It often forms dense stands.

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

    Dry Grassland; Mesic Grassland. Streamsides, moist, shrub-covered mountainsides.

  • Provided by: [A].e-Flora of South Africa
    • Source: [
    • 2
    • ]. 

    Distribution

    Geranium robustum ranges from around Ermelo and Suikerbosrand in the south-eastern Transvaal through the low Drakensbtrg and nearby parts of northern Natal to the eastern highlands of the Orange Free State, thence through Lesotho to the Witteberg and the Cape Drakensberg as far south as the Saalboom Valley near Barkly East; Glass 505 (SAM) reputedly came from Grahamstown, but that locality is highly improbable.

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

      Bibliography

    • 1 Burtt, BL; Hilliard, OM. 1985. A revision of Geranium in Africa south of the Limpopo. Notes Roy. Bot. Gard. Edinburgh 42(2): 171 - 225.
    • 2 Masupa, TT; Retief, E; Meyer, NL. 2017. Geraniaceae. In: E Retief & NL Meyer (eds), Plants of the Free State: Inventory and identification guide. Strelitzia 38: 581 - 590. South African National Biodiversity Institute, Pretoria.
    • 3 Revis. Gen. Pl.

     Information From

    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
    • A All Rights Reserved
    Geraniaceae
    World Flora Online Data. 2017.
    • B CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).