Difference between revisions of "Helianthus smithii"
Rhodora 66: 346. 1964.
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|distribution=Ala.;Ga.;Tenn. | |distribution=Ala.;Ga.;Tenn. | ||
|discussion=<p>Of conservation concern.</p><!-- | |discussion=<p>Of conservation concern.</p><!-- | ||
| − | --><p>Helianthus smithii is known from relatively few sites. T. A. Storbeck (1984) concluded that it is a distinct species; he could not rule out the possibility that it might be a hybrid of H. microcephalus and H. strumosus. It may also be an extreme variant of H. strumosus that has relatively narrow leaves and small heads.</p> | + | --><p><i>Helianthus smithii</i> is known from relatively few sites. T. A. Storbeck (1984) concluded that it is a distinct species; he could not rule out the possibility that it might be a hybrid of <i>H. microcephalus</i> and <i>H. strumosus</i>. It may also be an extreme variant of <i>H. strumosus</i> that has relatively narrow leaves and small heads.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1964 | |publication year=1964 | ||
|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_381.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | ||
Revision as of 15:34, 18 September 2019
Perennials, 70–150 cm (rhizomatous). Stems (usually purplish) erect, glabrous (glaucous). Leaves cauline; opposite (proximal) or alternate; petioles to 1.3 cm; blades (light to dark green, 1-nerved) lance-linear to lanceolate, 7–18 × 1–1.8 cm, bases ± cuneate, margins serrulate, abaxial faces ± hispid, gland-dotted. Heads 1–5. Peduncles 3–6 cm. Involucres hemispheric, 5–15 mm diam. Phyllaries 15–20, lanceolate, 6–9 × 2–2.7 mm, (margins ciliate) apices short-acuminate, abaxial faces glabrous or glabrate, not gland-dotted. Paleae 5.5–6.5 mm, 3-toothed (gland-dotted). Ray florets 6–9; laminae 10–15 mm. Disc florets 25+; corollas 5.5–6 mm, lobes yellow; anthers dark, appendages dark. Cypselae 2.8–3 mm, glabrate; pappi of 2 aristate scales 1.5–2 mm. 2n = 68.
Phenology: Flowering late summer–fall.
Habitat: Dry, open woods
Elevation: 100–300+ m
Distribution
Ala., Ga., Tenn.
Discussion
Of conservation concern.
Helianthus smithii is known from relatively few sites. T. A. Storbeck (1984) concluded that it is a distinct species; he could not rule out the possibility that it might be a hybrid of H. microcephalus and H. strumosus. It may also be an extreme variant of H. strumosus that has relatively narrow leaves and small heads.
Selected References
None.