Lactuca lasiorhiza (O.Hoffm.) C.Jeffrey


Cite taxon page as 'WFO (2020): Lactuca lasiorhiza (O.Hoffm.) C.Jeffrey. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000017262. Accessed on: 28 Oct 2020'

Morphology

Capitula erect, few to numerous, densely aggregated in a pulviniform synflorescence up to 10 cm. in diam.; flowering stalks congested, usually shorter than the capitula but occasionally up to c. 3.5 cm. long, partly or completely enveloped in the rootcrown hairs, simple or shortly branched, bracteate, glabrous to pilose, lanate in the axils; bracts 4–12 mm. long, lanceolate.

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    Leaves radical, appearing after flowering, c. 9(25) cm. long, mostly oblanceolate in outline, acute at the apex, attenuate to cuneate below, remotely denticulate to runcinate-pinnatifid, ± densely pilose to glabrescent, midribs lanate below.

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    Achenes dark-brown c. 9 mm. long including the beak, fusiform, apically attenuate into a beak c. 3 mm. long, narrowly-ribbed, scabridulous, glabrous; pappus copious several-seriate, of numerous barbellate setae up to 10 mm. long.

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    Phyllaries 3–4-seriate, from c. 4 mm. long outside to c. 15 mm. long inside, lanceolate acute to acuminate, margins hyaline entire or remotely serrulate.

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    Corollas c. 16 mm. long; tubes narrowly-cylindric, rugulose, puberulous above; ligules yellow, sometimes becoming reddish-purple outside, c. 10 mm. long, lorate, erect, glabrous, apical lobes densely papillose outside.

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    An acaulescent perennial herb rarely more than 7 cm. tall; taproot large, semi-woody, up to c. 3 cm. in diam. at the apex; rootcrown very densely brown sericeous-lanate with hairs c. 2 cm. long.

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    Involucre 11–18 x 4–8 mm., cylindric to narrowly campanulate.

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    Fig. 20/1 (achene).

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    Achenes 6.5–9 mm long including beak, ribbed, with a beak of 1–3 mm long; pappus white, 8–10 mm long.

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    Perennial herb; root woody, to 3 cm in diameter, with densely long-hairy root-crown.

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    Leaves usually absent at flowering stage, developing afterwards, in a rosette, lanceolate to broadly obovate, 2–9 cm long, 2–6.5 cm wide (lobed and to 29x8 cm in quercifolia form), base attenuate, margins with distant dark teeth, apex obtuse and mucronate, sparsely pilose, denser on the veins, the midrib densely hairy beneath.

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    Capitula (1–)4–24 in compact, dense, subsessile corymbs; inflorescence axes to 2 cm long, glabrous, with narrowly triangular bracts to 5 mm long; capitula with 10–14 florets; involucre 11–18 mm long; phyllaries grey-green marked with red, ovate or lanceolate, 4–15 mm long, acute or rounded, distally pilose and ciliate or sometimes glabrous with only the very apex densely hairy.

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    Corolla bright yellow, tube cylindric, 8.5–9.5 mm long, ligule 8–10 mm long, ± 1.5 mm wide.

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