Silphium Linnaeus (Q2795)
Silphium is a taxon with the rank genus within the tribe Heliantheae
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Silphium Linnaeus
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Silphium is a taxon with the rank genus within the tribe Heliantheae
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Statements
taxon/id/Silphium Linnaeus
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Silphium Linnaeus
Silphium
Linnaeus
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
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Stems usually erect, usually branched (terete or square, often vernicose with resinous exudates).
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petiolate or sessile;
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blades (1-nerved or 3-nerved) deltate, elliptic, linear, ovate, or rhombic, sometimes 1–2-pinnately lobed or pinnatifid, bases cordate or truncate to cuneate, margins entire or toothed, faces glabrous or hairy (sometimes stipitate-glandular).
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Heads radiate, in paniculiform or racemiform arrays.
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Involucres campanulate to hemispheric, 10–30 mm diam.
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Phyllaries persistent, 11–45 in 2–4 series (outer broader, foliaceous, inner smaller, thinner, each subtending a ray-floret).
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Receptacles flat to slightly convex, paleate (paleae oblong, lanceolate, or linear).
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Ray-florets 8–35+ in 1–4 series, pistillate, fertile;
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corollas yellow or white.
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Disc-florets 20–200+, functionally staminate;
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corollas yellow or white, tubes much shorter than narrow, cylindric throats, lobes 5, deltate.
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pappi 0, or persistent, of 2 awns (± confluent with cypsela shoulders and wings).
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sometimes 1-2-pinnately
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