Senecio Linnaeus (Q2929)
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Senecio is a taxon with the rank genus within the tribe Senecioneae
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Senecio Linnaeus
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Senecio is a taxon with the rank genus within the tribe Senecioneae
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Statements
taxon/id/Senecio Linnaeus
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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
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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).
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Stems single or clustered, erect to lax (simple or branched).
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petiolate or sessile (bases sometimes clasping);
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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).
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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.
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Calyculi usually of 1–8+ bractlets (bractlets often intergrading with distal peduncular bracts, mostly 1/5–1/2+ times phyllaries), sometimes 0.
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Involucres mostly cylindric or turbinate to campanulate, 5–15 (–40) mm diam.
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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.
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Receptacles flat to convex, foveolate, epaleate.
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Ray-florets usually ± 5, 8, 13, or 21 [34], pistillate, fertile, sometimes 0;
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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).
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Disc-florets (5–) 13–80+, bisexual, fertile;
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corollas usually yellow, rarely ochroleucous, white, reddish, or purplish, tubes shorter than to equaling campanulate throats, lobes 5, erect to recurved, usually ± deltate;
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style-branches stigmatic in 2 lines, apices usually truncate-penicillate.
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Cypselae cylindric or prismatic, usually 5-ribbed or angled, glabrous or hairy (especially on ribs or angles, hairs sometimes myxogenic);
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pappi usually persistent (fragile), sometimes readily falling, of 30–80+, white to stramineous, barbellulate to smooth bristles.
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nerved
subpalmately to pinnately
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deltate
oblanceolate lanceolate linear or filiform
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deltate
oblanceolate lanceolate linear or filiform
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deltate
oblanceolate lanceolate linear or filiform
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deltate
oblanceolate lanceolate linear or filiform
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