Tonestus A. Nelson (Q2521)

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Tonestus is a taxon with the rank genus within the tribe Astereae
Language Label Description Also known as
English
Tonestus A. Nelson
Tonestus is a taxon with the rank genus within the tribe Astereae

    Statements

    taxon/id/Tonestus A. Nelson
    0 references
    Tonestus A. Nelson
    Tonestus
    A. Nelson
    FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 20: Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford University Press, New York.
    accepted
    Serpentweed (English)
    w North America
    Stems erect, simple, hairy and/or ± densely stipitate-glandular.
    petiolate (basal and cauline) or sessile (cauline);
    basal blades 1-nerved, 3-nerved, or 5-nerved, linear to broadly spatulate, cauline progressively reduced distally (bases ± clasping), margins entire, coarsely and irregularly serrate, dentate, or lobed, sometimes ciliate, faces glabrous or scabrous, eglandular or stipitate-glandular.
    Heads radiate or discoid, in usually racemiform, sometimes corymbiform arrays.
    Involucres narrowly to broadly campanulate, (5–28 ×) 6–20 mm.
    Phyllaries 16–34 (–44) in 3–4 (–5) series, usually green, sometimes anthocyanic, 1-nerved or weakly 3–5-nerved (flat), equal to unequal, sometimes chartaceous proximally, margins ciliolate or eciliate, faces often stipitate-glandular at least distally;
    inner linear to narrowly oblong, margins scarious, fimbriate (apices acute to acuminate, sometimes reflexed), faces sometimes stipitate-glandular distally.
    Receptacles convex, pitted, epaleate.
    Ray-florets 0, or 10–23 (–35), pistillate, fertile;
    corollas yellow (tubes sparsely hairy, laminae narrowly elliptic, coiling at maturity).
    Disc-florets 13–66, bisexual, fertile;
    corollas yellow, tubes (glabrous or sparsely hairy) shorter than narrowly funnelform to ± ampliate throats, lobes 5, erect or spreading, deltate to broadly lanceolate;
    style-branch appendages subulate to lanceolate.
    Cypselae cylindric to linear, terete, 4–12-nerved, faces glabrous or villous;
    pappi persistent, of 30–60 whitish, ± equal, brittle or flexible, fine, barbellate, apically attenuate bristles in 1 series (± equaling corollas).