Tetradymia de Candolle in A. P. de Candolle and A. L. P. P. de Candolle (Q2960)

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

    Statements

    taxon/id/Tetradymia de Candolle
    0 references
    Tetradymia de Candolle
    Tetradymia
    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
    w North America
    nw Mexico
    Shrubs, mostly 30–200 cm.
    Stems 1–5+, erect to spreading (tomentose to pannose or glabrous, often spiny).
    sessile (or obscurely petiolate);
    blades obscurely palmately nerved (usually 1-nerved), linear to filiform, narrowly lanceolate, or oblanceolate, margins entire, faces glabrous or lanate to tomentose, sometimes glabrescent.
    Heads discoid, (1–3) in distil axils or (3–8) in corymbiform clusters.
    Involucres turbinate to cylindric or hemispheric, 3–10+ mm diam.
    Phyllaries persistent, 4–6 in 1–2 series, erect, distinct, mostly oblong to ovate or lanceolate, equal or subequal, margins obscurely scarious.
    Receptacles flat, foveolate, epaleate.
    Disc-florets 4–9, bisexual, fertile;
    corollas cream to bright-yellow, tubes longer than funnelform or abruptly dilated throats, lobes 5, recurved, linear to lanceolate;
    style-branches stigmatic in 2 lines, apices usually truncate to rounded-truncate, sometimes truncate-penicillate (appendages essentially 0).
    Cypselae prismatic to obconic or fusiform, obscurely 5-ribbed, glabrous or hirsute to densely pilose (hairs often obscuring pappi);
    pappi 0 or of 70–150 bristles or of 20–30, white to stramineous, subulate to setiform scales.