Launaea rogersii (Humbert) Humbert & Boulos
  • in Fl. Madag. Fam. 189, 882(1963)


Cite taxon page as 'WFO (2020): Launaea rogersii (Humbert) Humbert & Boulos. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000023483. Accessed on: 24 Oct 2020'

Morphology

Florets 3–4(6) per capitulum; corollas yellow becoming reddish-purple, up to 10.5 mm. long, ligules c. 5 mm. long, glabrous.

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    Achenes light- or reddish-brown, c. 4.5 mm. long, narrowly subfusiform, finely ribbed, glabrous or minutely hispidulous; pappus many-seriate, composed of white barbellate setae 4–6 mm. long.

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    Involucres c. 7 x 1.5 mm., narrowly cylindric, accrescent, becoming c. 10 mm. long and spreading; phyllaries green to purplish, glabrous, each often subapically corniculate, eventually swollen and corky towards the base; inner phyllaries 5, subequal, 7–10 mm. long, lorate-lanceolate, 4–5 times longer than the outer.

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    A scapose, glabrous somewhat glaucous perennial herb up to c. 60 cm. tall, from a semi-woody rootstock.

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    Leaves appearing after the flowers, 2–5 radical ± prostrate, up to c. 13 x 8 cm., elliptic-obovate to rotund, apices obtuse to rounded, margins entire or acicular-denticulate, bases ± broadly cuneate, lamina thinly succulent, glabrous and ± glaucous beneath.

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    Flower stalks green or purple-tinged, usually solitary, wiry, branched above with divaricate-ascending slender branches, or flower stalks shorter and more densely branched.

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    Capitula numerous, subsessile or shortly stalked, singly or in groups of 2–4 along the branches.

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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).
    Plants Of the World Online Portal - FZ
    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
    • B
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).