Senecio oxyriifolius DC.


Cite taxon page as 'WFO (2020): Senecio oxyriifolius DC. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000019221. Accessed on: 09 Apr 2020'

Diagnostic Description

Very variable in leaf form. It is closely allied to S. rhomboideus but is easily distinguished by its differently shaped leaves on long terete petioles. Although both species are discoid, it seems possible that radiate forms may occur (a radiate specimen is cited under S. rhomboideus). Then S. tropaeoli-folius MacOwan (Grahamstown, MacOwan 905, K, PRE, type) appears to be little more than a radiate form of S. oxyriifolius and is known only from Grahamstown and the Zuurberg.

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

    Ray florets 0; disc florets pale to golden yellow, corolla 4.8–6 mm long, expanded above the middle into infundibuliform to campanulate upper part, glabrous, lobes 1 mm long.

  • Provided by: [C].Plants Of the World Online Portal - FTEA
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    Capitula discoid, pendulous to erect, numerous in long-stalked dense to spreading or lax terminal corymbs; stalks of the individual capitula slender, often glaucous; involucre cylindrical, pale green or glaucous, 6.5–8.5 mm long, 2–3 mm in diameter; bracts of calyculus 0–2, lanceolate, 1.5–5.5 mm long; phyllaries 5–8, pale green or glaucous, 6–8 mm long.

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    Lower and median stem leaves succulent or somewhat succulent, pale green or glaucous, the lower small, soon disappearing, the median functional, 4–8, petiolate, peltate, circular, subreniform-circular to almost rounded-triangular or rounded-subhastate in outline, 2.5–6 cm long, 3.8–9.5 cm wide, margins closely sinuate-dentate to broadly sinuate-apiculate-dentate, apex rounded to obtuse and apiculate; petiole 2.5–8 cm long; upper leaves few, remote, small, lanceolate, scale-like.

  • Provided by: [C].Plants Of the World Online Portal - FTEA
    • Source: [
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    Perennial herb 40–110 cm high with horizontal, fleshy tuberous rhizome (or woody, fide Kerfoot 1779) and erect flowering stems; stems glabrous, succulent or rather succulent.

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    • Source: [
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    Achenes 2.5–3.2 mm long, ribbed, shortly hairy; pappus 4.7–5 mm long.

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    • Source: [
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    Glabrous, succulent perennial herb, up to 1 m high. Leaves orbicular to deltoid in outline, ± peltate; petioles long, terete. Heads discoid, involucral bracts 8(-10), (7-) 8-10(-12) mm long. Achenes and ovaries generally hispid between ribs, rarely glabrous. Flowers bright yellow.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
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    Glabrous, sometimes glaucous, fleshy perennial herb, rootstock somewhat creeping, tuberous, tubers woody, elongated, up to 5 x 1 cm, flowering stems usually one, sometimes few, from the crown, up to 1 m tall, generally simple below the inflorescence branches, occasionally forking near the base, leafy near the base (though characteristically nude at the very base), nude above. Leaves fleshy, up to c. 9 x 9 cm but commonly only half that, variable in shape and toothing, orbicular and peltate to deltoid and peltate, or with varying degrees of development of a broad or narrow sinus, then either more or less peltate or the petiole arising at the base of the sinus, often with much variation on a single plant, margins rarely entire or nearly so, usually at least sinuate and distantly callose-denticulate, or often more coarsely, irregularly and sharply callose-dentate or sharply angled, petioles long (up to 15 cm), terete. Heads discoid, few to many on long nude peduncles corymbose-paniculately arranged. Involucre turbinate-campanulate, bracts 8(-10), (7-)8-10(-12) mm long, equalling the disc, broad, flat, leathery, with resinous lines, calyculus bracts few, very small. Flowers bright yellow. Achenes 3.5-4.5 mm long, cylindric, ribbed, generally hispid between the ribs, rarely glabrous.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 7
    • ]. 

    Habitat

    Grassland among rock outcrops.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 6
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    Grows in grassland, particularly among rock outcrops, in Natal from near sea level to c. 2300 m.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 7
    • ]. 

    Distribution

    A common and widespread species, ranging from Humansdorp in the southern Cape through the eastern Cape, Transkei and East Griqualand to the highlands of the eastern Transvaal and the Magaliesberg, the eastern highlands of Rhodesia, and on to the mountains of Malawi and Mbeya distr. in Tanzania.

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

     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
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • C
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).