Pyrrocoma Hooker (Q2281)

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Pyrrocoma is a taxon with the rank genus within the tribe Astereae
Language Label Description Also known as
English
Pyrrocoma Hooker
Pyrrocoma is a taxon with the rank genus within the tribe Astereae

    Statements

    taxon/id/Pyrrocoma Hooker
    0 references
    Pyrrocoma Hooker
    Pyrrocoma
    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
    Goldenweed (English)
    w North America
    Stems decumbent to ascending or erect (leafy or subscapiform, often red-tinged), mostly simple.
    basal usually short-petiolate, cauline sessile;
    basal blades 1-nerved, oblanceolate to elliptic or nearly linear (3–250 (–450) × 3–30 mm, bases usually attenuate), margins entire or spinulose-dentate or serrate or shallowly laciniate;
    cauline often lanceolate, reduced distally (bases sometimes clasping).
    Heads usually radiate or disciform, rarely discoid, borne singly or 2–5 (–15) in racemiform, spiciform, or loose, corymbiform arrays (subtended by leafy bracts in P. carthamoides and P. radiata).
    Involucres hemispheric to narrowly campanulate, 5–15 (–30) × 5–60 mm.
    Phyllaries 10–40 in 2–6 series, appressed to loosely spreading, 1-nerved, oblanceolate to oblong or linear, equal or unequal, usually herbaceous and yellow-green or with distinct, green apical patch, sometimes proximal 2/3 white-indurate (apices occasionally squarrose, obtuse or acute, occasionally mucronate), faces glabrous or densely villous to tomentose.
    Receptacles convex, pitted, epaleate.
    Ray-florets 10–80, pistillate, fertile;
    corollas yellow (usually 10–35 mm, sometimes reduced, not surpassing involucres).
    Disc-florets 20–100, bisexual, fertile;
    corollas yellow, tubes ± equaling tubular-funnelform throats, lobes 5, erect, deltate;
    style-branch appendages triangular.
    Cypselae subcylindro-fusiform, terete to ± flattened, 3–4-angled, faintly 10–12-nerved, faces sericeous to strigose or glabrous;
    pappi persistent, of 15–60 brownish, rigid, unequal, smooth, apically attenuate bristles in 1 series.