Hymenoxys richardsonii (Hooker) Cockerell (Q2709)

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Hymenoxys richardsonii is a taxon with the rank species within the subgenus Hymenoxys subg. Picradenia
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English
Hymenoxys richardsonii (Hooker) Cockerell
Hymenoxys richardsonii is a taxon with the rank species within the subgenus Hymenoxys subg. Picradenia

    Statements

    taxon/id/Hymenoxys richardsonii (Hooker) Cockerell
    0 references
    Hymenoxys richardsonii (Hooker) Cockerell
    Hymenoxys richardsonii
    (Hooker) Cockerell
    FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 21: Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York.
    accepted
    Hymenoxys richardsonii
    Richardson's bitterweed (English)
    Colorado bitterweed (English)
    Colorado rubberweed (English)
    pingue rubberweed (English)
    hyménoxys de Richardson (French)
    Richardson’s bitterweed (English)
    pingue rubberweed (English)
    Stems 1–20 (–30+), usually green throughout, rarely purple-red-tinted proximally, branched distally, glabrous or ± hairy.
    Leaves: blades simple or lobed (lobes 3–7), glabrous or ± hairy, glanddotted (basal leaf-bases densely long-villous-woolly);
    mid leaves lobed (lobes 3–5, terminal lobes 0.7–2 mm wide).
    Heads 5–300+ per plant, in corymbiform arrays.
    Peduncles 1–5 cm, ± hairy.
    Involucres campanulate, 7–11 × 7–14 mm.
    Phyllaries in 2 series, unequal;
    outer 8–13, obovate to ovate to lanceolate, basally connate 1/2 their lengths, 3.5–8 mm, apices acuminate to acute;
    inner 8–18, obovate, 3–8 mm, apices mucronate.
    Ray-florets 7–14;
    corollas yellow, 7–17 × 3–6 mm.
    Disc-florets 25–75+;
    corollas 3–5 mm.
    Cypselae narrowly obpyramidal, 2–3 mm;
    pappi of 4–8 obovate to lanceolate, aristate scales 1.8–3.5 mm. 2n = 30.