Xanthisma de Candolle in A. P. de Candolle and A. L. P. P. de Candolle (Q2528)

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Xanthisma is a taxon with the rank genus within the tribe Astereae
Language Label Description Also known as
English
Xanthisma de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
Xanthisma is a taxon with the rank genus within the tribe Astereae

    Statements

    taxon/id/Xanthisma de Candolle
    0 references
    Xanthisma de Candolle
    Xanthisma
    de Candolle
    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
    Sleepy-daisy (English)
    w North America
    Mexico
    Annuals, biennials, perennials, or subshrubs, 3–100 cm (taprooted, caudices woody, much branched [rhizomes]).
    Stems erect, spreading, or sprawling, often much branched, glabrous or hispid to hispidulous, villous, or stipitate-glandular (especially distally).
    Leaves: basal (sometimes persistent) and cauline;
    short-petiolate or sessile;
    blades 1-nerved, lanceolate to oblanceolate or spatulate (bases tapering to clasping), margins entire, serrate, dentate, pinnatifid, or 2-pinnatifid (apices of blades, lobes, and teeth apiculate to bristle-tipped, bristles 1–4 mm), faces usually glabrous, hispid, hispidulous, or villous, sometimes also stipitate-glandular.
    Heads radiate or discoid, borne singly or in corymbiform arrays.
    Involucres turbinate, campanulate, or hemispheric, (4–10 ×) 6–25 mm.
    Phyllaries 26–80+ in 2–8 series, appressed, spreading, or reflexed, 1-nerved (flat to rounded), linear to narrowly oblong or lanceolate, or enlarged distally into ovate to orbiculate or depressed-elliptic laminae, unequal, stiff, leathery, bases indurate, margins sometimes scarious, (apices herbaceous or achlorophyllous) faces hispid to hispidulous, villous, and/or stipitate-glandular.
    Receptacles flat to convex, pitted (pit borders usually laciniate or irregularly bristly, the teeth or setae 0.1–2+ mm), epaleate.
    Ray-florets 0 (in X. grindelioides and 2 Mexican taxa) or 12–60+, pistillate, fertile;
    corollas white, pink, red-purple, purple, or yellow.
    Disc-florets 15–200+, bisexual, fertile;
    corollas yellow, tubes length 1/4–1/3 ± funnelform throats (usually glabrous), lobes 5, spreading, triangular (glabrous or sparsely puberulent, hairs fine, antrorse);
    style-branch appendages lanceolate.
    Cypselae distinctly dimorphic (tan to redbrown or purple), ellipsoid to obovoid, oblong, or obscurely cordate, those of rays (if present) ± 3-sided, rounded abaxially, of disc compressed (thin or thick walled), 6–18-ribbed, faces silky (hairs antrorsely ascending to appressed);
    pappi persistent, of 30–90+ usually whitish to brown or reddish-brown, basally flattened (wider at overlapping bases), coarsely barbellate, apically attenuate bristles in 2–4 series.