Difference between revisions of "Helianthus strumosus"
Sp. Pl. 2: 905. 1753.
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|name=Helianthus montanus | |name=Helianthus montanus | ||
|authority=E. Watson | |authority=E. Watson | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Helianthus saxicola | |name=Helianthus saxicola | ||
|authority=Small | |authority=Small | ||
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|elevation=0–1500 m | |elevation=0–1500 m | ||
|distribution=Ont.;Que.;Ala.;Ark.;Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;N.H.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis. | |distribution=Ont.;Que.;Ala.;Ark.;Conn.;Del.;D.C.;Fla.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;N.H.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis. | ||
| − | |discussion=<p>Helianthus strumosus is variable, particularly for leaf shape and indument; sufficient study has not been undertaken to evaluate whether regional forms deserve taxonomic recognition. Hybridization with other polyploids, including H. decapetalus, H. hirsutus, and H. tuberosus, further complicates the situation. It differs from H. tuberosus in having glabrous (or glabrate) stems and in lacking tubers.</p> | + | |discussion=<p><i>Helianthus strumosus</i> is variable, particularly for leaf shape and indument; sufficient study has not been undertaken to evaluate whether regional forms deserve taxonomic recognition. Hybridization with other polyploids, including <i>H. decapetalus</i>, <i>H. hirsutus</i>, and <i>H. tuberosus</i>, further complicates the situation. It differs from <i>H. tuberosus</i> in having glabrous (or glabrate) stems and in lacking tubers.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1753 | |publication year=1753 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V21_380.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | ||
Revision as of 16:34, 18 September 2019
Perennials, 100–200 cm (rhizomatous). Stems erect, glabrous or glabrate. Leaves cauline; mostly opposite, sometimes alternate (distal); petioles 1–3 cm; blades (light to dark green, 3-nerved distal to bases) lanceolate to lance-ovate or ovate, 7–18 × 2–10 cm, bases subcordate to ± cuneate, margins entire to ± serrate, abaxial faces glabrous or tomentulose, usually densely gland-dotted. Heads 3–15. Peduncles 1–9 cm. Involucres cylindric to hemispheric, 8–20 mm diam. 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 gland-dotted. Paleae 5.3–6.5 mm, 3-toothed. Ray florets 10–20; laminae ca. 12–20(–30) mm. Disc florets 35+; corollas 5.5–6.5 mm, lobes yellow; anthers dark, appendages dark or reddish brown. Cypselae 4–5.5 mm, glabrate; pappi of 2 aristate scales (1–)2–2.5 mm. 2n = 68, 102.
Phenology: Flowering late summer–fall.
Habitat: Woods, roadsides, prairies
Elevation: 0–1500 m
Distribution
Ont., Que., Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.
Discussion
Helianthus strumosus is variable, particularly for leaf shape and indument; sufficient study has not been undertaken to evaluate whether regional forms deserve taxonomic recognition. Hybridization with other polyploids, including H. decapetalus, H. hirsutus, and H. tuberosus, further complicates the situation. It differs from H. tuberosus in having glabrous (or glabrate) stems and in lacking tubers.
Selected References
None.