Senecio Linnaeus (Q2929)

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Senecio is a taxon with the rank genus within the tribe Senecioneae
Language Label Description Also known as
English
Senecio Linnaeus
Senecio is a taxon with the rank genus within the tribe Senecioneae

    Statements

    taxon/id/Senecio Linnaeus
    0 references
    Senecio Linnaeus
    Senecio
    Linnaeus
    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
    Groundsel (English)
    ragwort (English)
    butterweed (English)
    Nearly worldwide
    mostly in warm-temperate
    subtropical
    and tropical regions at mid and upper elevations
    Annuals, biennials, perennials, subshrubs, or shrubs, 5–100 (–250+) cm (perennating bases taprooted, fibrous-rooted, branched caudices, or suberect to creeping rhizomes; roots often fleshy, seldom branched; herbage glabrous or hairy, often glabrescent at flowering).
    Stems single or clustered, erect to lax (simple or branched).
    petiolate or sessile (bases sometimes clasping);
    blades subpalmately to pinnately nerved, mostly ovate or deltate to oblanceolate, lanceolate, linear, or filiform (and most intermediate shapes), rarely suborbiculate (sometimes palmately or pinnately lobed to 2–3-pinnatifid), ultimate margins entire or denticulate to serrate or toothed (sometimes with relatively many callous denticles or teeth), faces glabrous or hairy (usually arachnose to tomentose, often glabrescent).
    Heads (sometimes nodding) usually radiate or discoid (rarely quasi-disciform), usually in corymbiform to cymiform, sometimes paniculiform or racemiform, arrays (sometimes from axils of distal leaves), sometimes borne singly.
    Calyculi usually of 1–8+ bractlets (bractlets often intergrading with distal peduncular bracts, mostly 1/5–1/2+ times phyllaries), sometimes 0.
    Involucres mostly cylindric or turbinate to campanulate, 5–15 (–40) mm diam.
    Phyllaries persistent, usually ± 5, 8, 13, or 21 [34] in (1–) 2 series, distinct (margins interlocking), erect (often reflexed in fruit), mostly oblong to lanceolate or linear, subequal or equal, margins usually scarious.
    Receptacles flat to convex, foveolate, epaleate.
    Ray-florets usually ± 5, 8, 13, or 21 [34], pistillate, fertile, sometimes 0;
    corollas usually yellow, sometimes ochroleucous or white, rarely reddish to purplish (laminae sometimes barely surpassing phyllaries; peripheral pistillate florets usually 0, sometimes 1–8+; corollas usually yellow, sometimes ochroleucous or white).
    Disc-florets (5–) 13–80+, bisexual, fertile;
    corollas usually yellow, rarely ochroleucous, white, reddish, or purplish, tubes shorter than to equaling campanulate throats, lobes 5, erect to recurved, usually ± deltate;
    style-branches stigmatic in 2 lines, apices usually truncate-penicillate.
    Cypselae cylindric or prismatic, usually 5-ribbed or angled, glabrous or hairy (especially on ribs or angles, hairs sometimes myxogenic);
    pappi usually persistent (fragile), sometimes readily falling, of 30–80+, white to stramineous, barbellulate to smooth bristles.