Oresbia heterocarpa Cron & B.Nord.
  • Novon 16(2): 216 (-223; figs. 1-4)


Cite taxon page as 'WFO (2020): Oresbia heterocarpa Cron & B.Nord. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000018999. Accessed on: 25 Oct 2020'

Morphology

Erect perennial herb, to about 30 cm tall; stems herbaceous, somewhat woody at the base, unbranched or branching sparingly near base, tomentose to cobwebby, glabrescent with age. Leaves cauline, alternate, sessile, narrowly obovate to elliptic or ovate, non-pinnatifid, lamina 16-66(-80) x 4-23(-28) mm, thickly cobwebby to glabrescent above, densely white-tomentose below; apex acute; margin dentate to serrate, revolute; leaf-base clasping, without auricles. Capitula heterogamous, radiate, usually in twos or threes (rarely as many as 11) per stem, occasionally solitary; peduncles 0.5-4 cm to point of branching, as long as 9 cm if unbranched, densely cobwebby, subtended by lanceolate bracts (1-2.5 cm long) and with smaller bracts along their length, distally nude; receptacle flat or slightly convex, glabrous; involucre widely campanulate to cup-shaped, calyculate with 4 to 7 linear-lanceolate calyculus bracts 2-4 mm long; phyllaries subuniseriate, 16 to 20, linear-lanceolate, (5.5-)6.5-7.5 mm long, cobwebby to tomentose, glabrescent toward the apex, 1- to 3-veined, acuminate, margins narrowly scarious. Ray florets 8 to 13, female, glabrous; tube 2.5-3 mm long, cylindrical; limb oblong, 5-12 mm, 4-veined, yellow. Disc florets hermaphroditic, 25 to 42; corolla tubular below, narrowly campanulate above, 5.0-6.2 mm long, yellow; corolla lobes triangular-ovate, 0.5-0.7 mm long, apically subcucullate and minutely papillate; anthers basally sagittate or shortly caudate; apical appendage ovate, obtuse; endothecial tissue radial; filament collar distinctly balusterform; style branches with separate stigmatic areas; apex truncate with short sweeping hairs, outside glabrous. Cypselae heteromorphic: ray cypselae 4 winged, glabrous, brown to reddish brown, 2.0-3.5 mm long; epicarp cells rectangular, smooth with raised ridges; disc cypselae oblong-cylindrical with 6 ribs, not compressed or margined or winged, 1.5-2.2 mm long, with mucilaginous twin hairs on ribs; epicarp cells with rounded ends, striate; carpopodium absent or obscure; pappus bristles pluriseriate, 4-5 mm long, barbellate, white, caducous.

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

    Stout, white-woolly perennial to 75 cm, woody below. Leaves oblanceolate, sometimes slightly lobed, margins toothed, glabrescent above, white-woolly below. Flower heads radiate, in lax corymbs on stout peduncles, yellow.

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

    Habitat

    Growing in moist areas shaded by rocks or low shrubs, or at the edge of caves, on south-facing or southeastern slopes or below cliffs, on ledges, on Table Mountain Sand stone and on shale bands.

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

    Moist slopes and ravines.

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

    Distribution

    South Africa in the Western Cape, predominantly in the mountains around Franschhoek, Worcester, Paarl, Ceres, and Clanwilliam.

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

    Cedarberg and Peninsula to Riviersonderend Mtns and Swartberg.

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

      Bibliography

    • 1 Cron, GV; Nordenstam, RB. 2006. Oresbia, a new south African genus of the Asteraceae, Senecioneae. Novon 16(2): 216 - 223.
    • 2 Manning, JC; Goldblatt, P. 2012. Asteraceae: Oresbia Cron & B.Nord. 401 - 401. South African National Biodiversity Institute, Pretoria.
    • 3 Novon 16(2): 216 (-223; figs. 1-4)

     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).