Tetraneuris Greene (Q2711)

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Tetraneuris is a taxon with the rank genus within the tribe Helenieae
Language Label Description Also known as
English
Tetraneuris Greene
Tetraneuris is a taxon with the rank genus within the tribe Helenieae

    Statements

    taxon/id/Tetraneuris Greene
    0 references
    Tetraneuris Greene
    Tetraneuris
    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)
    North America
    Mexico
    Stems 1–60, erect or ± decumbent, unbranched or sparingly branched distally.
    petiolate or sessile;
    blades (usually with distinct midribs) mostly oblanceolate to linear or filiform, sometimes lobed, ultimate margins usually entire, sometimes toothed, faces glabrous or ± hairy, eglandular or ± glanddotted.
    Heads radiate or discoid, borne singly or in paniculiform to corymbiform or fastigiate arrays.
    Involucres hemispheric to campanulate 6–20 mm diam.
    Phyllaries 11–60+ in 3 series (mostly spreading to erect in fruit, distinct, herbaceous; outer with or without scarious margins, abaxial faces ± hairy; mid usually same number as, alternating with, and similar to outer, almost always with ± scarious margins; inner narrower than others, margins scarious).
    Receptacles hemispheric to conic, shallowly pitted or smooth, epaleate.
    Ray-florets 0 or 7–27, pistillate, fertile;
    corollas (usually marcescent) yellow (laminae fan-shaped to oblanceolate, usually 3-lobed).
    Disc-florets 20–250+, bisexual, fertile;
    corollas yellow proximally, yellow or purplish distally, tubes shorter than cylindric to cylindro-campanulate throats, lobes 5, ± deltate.
    Cypselae ± obpyramidal, moderately to densely hairy;
    pappi persistent, of 4–8 usually aristate, scales.