Hymenoxys Cassini in F. Cuvier (Q2707)

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Hymenoxys is a taxon with the rank genus within the tribe Helenieae
Language Label Description Also known as
English
Hymenoxys Cassini in F. Cuvier
Hymenoxys is a taxon with the rank genus within the tribe Helenieae

    Statements

    taxon/id/Hymenoxys Cassini
    0 references
    Hymenoxys Cassini
    Hymenoxys
    Cassini
    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
    Bitterweed (English)
    rubberweed (English)
    North America
    Mexico
    Central America
    South America. Subgenus Hymenoxys
    which occurs only in South America
    contains four species
    three of which are discoid
    Stems 1–30+, erect, unbranched or branched, green throughout to purple-red-tinted proximally or distally to purple-red-tinted throughout, glabrous or ± hairy.
    blades simple or 1–2-pinnately lobed, ultimate margins entire or toothed, faces glabrous or hairy, usually ± glanddotted (often in pits).
    Heads radiate [discoid], borne singly or in paniculiform to corymbiform arrays.
    Involucres subhemispheric, hemispheric, globoid, campanulate, or urceolate, (2.5–) 6–32 mm diam.
    Phyllaries persistent (or inner falling), usually (6–) 16–30 (–40) in 2 series and unequal, sometimes 28–50 in 2–3 series and subequal (usually spreading to erect in fruit).
    Receptacles usually hemispheric, globoid, ovoid, or conic (flat in H. ambigens), smooth or pitted, epaleate.
    Ray-florets usually (3–) 8–13 (–16), sometimes 14–34 [0], pistillate, fertile;
    corollas (usually withering after flowering, falling early or tardily) yellow or yellow-orange to orange (laminae fan-shaped, lobes 3–5).
    Disc-florets usually 25–150 (–400+), usually bisexual and fertile (6–15, functionally staminate in H. ambigens);
    corollas yellow to yellowbrown proximally, yellow distally, tubes shorter than cylindric to cylindric-campanulate throats, lobes 5, ± deltate.
    Cypselae obconic or obpyramidal, glabrous or hairy;
    pappi 0, or persistent, of 2–11 (–15) usually aristate scales.