Helianthus decapetalus Linnaeus (Q2752)
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Helianthus decapetalus is a taxon with the rank species within the genus Helianthus
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Helianthus decapetalus Linnaeus
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Helianthus decapetalus is a taxon with the rank species within the genus Helianthus
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Statements
taxon/id/Helianthus decapetalus Linnaeus
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Helianthus decapetalus Linnaeus
Helianthus decapetalus
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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CA-NB
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Hinds, H.R. 2000. Flora of New Brunswick : a manual for the identification of the vascular plants of New Brunswick. 2nd edition. Biology Department, University of New Brunswick, Fredericton. 699 pp.
CA-ON
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Newmaster, S.G., A. Lehela, M.J. Oldham, P.W.C. Uhlig & S. McMurray. 1998. Ontario Plant List. Ontario Forest Research Institute, Sault Ste. Marie, Ontario. Forest Information Paper No. 123. 550 pp.
CA-QC
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Marie-Victorin, Fr. 1995. Flore laurentienne. 3e éd. Mise à jour et annotée par L. Brouillet, S.G. Hay, I. Goulet, M. Blondeau, J. Cayouette et J. Labrecque. Gaétan Morin éditeur. 1093 pp.
CA-NB
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CA-ON
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CA-QC
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US-AL
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US-AR
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US-CT
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US-DE
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US-DC
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US-GA
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US-IL
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US-IN
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US-IA
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US-KY
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US-LA
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US-ME
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US-MD
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US-MA
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US-MI
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US-MS
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US-MO
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US-NH
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US-NJ
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US-NY
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US-NC
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US-OH
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US-OK
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US-PA
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US-RI
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US-SC
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US-TN
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US-VT
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US-VA
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US-WV
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US-WI
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10–1200 m
10 meter
1,200 meter
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Stems erect, glabrous.
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opposite (proximal or all) or alternate (distal);
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petioles (1–) 2–5 cm;
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blades (green, 3-nerved distal to bases) lanceolate to ovate, 7–21 × 4–10 cm, bases rounded to cuneate (often shortly decurrent onto petioles), margins usually serrate (moderately to notably in larger leaves), abaxial faces ± scabro-hispidulous, relatively sparsely glanddotted.
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Peduncles 2–12 cm (not glanddotted).
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Involucres hemispheric, 12–25 mm diam.
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Phyllaries 20–25 (often reflexed), lance-linear to lanceolate, 11–16 × 2–3 mm (sometimes leaflike, longest surpassing discs by 1/2+ their lengths), (margins ciliate) apices attenuate, abaxial faces strigillose to glabrate, not glanddotted.
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Paleae 8–10 mm, 3-toothed.
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Ray-florets 8–12;
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laminae 20–25 mm.
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Disc-florets 40+;
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corollas 6.5–7.2 mm, lobes yellow;
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anthers usually dark-brown to black (rarely reddish-brown), appendages dark or reddish-brown.
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Cypselae 3.5–5 mm;
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pappi of 2 aristate scales 3–4 mm. 2n = 34, 68.
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scabro-hispidulous
more or less
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