Helianthus Linnaeus (Q2749)
Helianthus is a taxon with the rank genus within the tribe Heliantheae
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Helianthus Linnaeus
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Helianthus is a taxon with the rank genus within the tribe Heliantheae
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taxon/id/Helianthus Linnaeus
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Helianthus Linnaeus
Helianthus
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 erect or ascending to decumbent or procumbent, usually branched distally.
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petiolate or sessile;
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blades usually 3-nerved (1-nerved in H. eggertii, H. smithii, and H. maximiliani), mostly deltate, lance-linear, lanceolate, lanceovate, linear, or ovate, bases cordate to narrowly cuneate, margins usually entire or serrate, rarely lobed, faces glabrous or hairy, often glanddotted.
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Heads usually radiate (sometimes discoid in H. radula), borne singly or in ± corymbiform, paniculiform, or spiciform arrays.
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Involucres usually ± hemispheric, sometimes campanulate or cylindric, 5–40+ (–200+ in cultivars) mm diam.
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Phyllaries persistent, 11–40 (–100+ in cultivars) in 2–3+ series (subequal to unequal).
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Receptacles flat to slightly convex (conic in H. porteri), paleate (paleae ± conduplicate, usually rectangular-oblong, usually ± 3-toothed, sometimes entire, apices sometimes reddish or purplish).
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Ray-florets usually 5–30+ (–100+ in cultivars), rarely 0, neuter;
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corollas usually yellow.
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Disc-florets (15–) 30–150+ (–1000+ in cultivars), bisexual, fertile;
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corollas yellow or reddish (at least distally), tubes shorter than campanulate throats, lobes 5, triangular (style-branches slender, appendages ± attenuate).
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Cypselae (usually purplish black, sometimes mottled) ± obpyramidal, ± compressed (glabrous, glabrate, or ± hairy);
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pappi 0 (H. porteri), or readily falling, of 2 (–3) usually lanceolate, aristate, or erose scales (at the 2 principal angles, 1–5 mm) plus 0–8 usually shorter scales (0.2–2 mm).
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hemispheric
usually more or less
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in more or less corymbiform , paniculiform or spiciform , arrays
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