Helianthus strumosus Linnaeus (Q2759)
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Helianthus strumosus is a taxon with the rank species within the genus Helianthus
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Helianthus strumosus Linnaeus
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Helianthus strumosus is a taxon with the rank species within the genus Helianthus
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Statements
taxon/id/Helianthus strumosus Linnaeus
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Helianthus strumosus Linnaeus
Helianthus strumosus
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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pale-leaved woodland sunflower (English)
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CA-NB
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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-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-FL
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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-KS
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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-MN
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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-ND
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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-TX
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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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Stems erect, glabrous or glabrate.
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mostly opposite, sometimes alternate (distal);
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blades (light to dark green, 3-nerved distal to bases) lanceolate to lanceovate or ovate, 7–18 × 2–10 cm, bases subcordate to ± cuneate, margins entire to ± serrate, abaxial faces glabrous or tomentulose, usually densely glanddotted.
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Involucres cylindric to hemispheric, 8–20 mm diam.
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Phyllaries 18–25 (erect, loose, or squarrose), lanceolate, 5.5–10 × 1.5–3 mm (equaling or slightly surpassing discs), (margins usually ciliate) apices acute to acuminate, abaxial faces glabrous or hispidulous, usually not glanddotted.
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Paleae 5.3–6.5 mm, 3-toothed.
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Ray-florets 10–20;
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laminae ca. 12–20 (–30) mm.
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Disc-florets 35+;
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corollas 5.5–6.5 mm, lobes yellow;
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anthers dark, appendages dark or reddish-brown.
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Cypselae 4–5.5 mm, glabrate;
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pappi of 2 aristate scales (1–) 2–2.5 mm. 2n = 68, 102.
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lanceolate
lanceovate or ovate
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