Difference between revisions of "Silphium glutinosum"
Castanea 66: 183, figs. 11, 12A–C. 2001.
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|elevation=100–300 m | |elevation=100–300 m | ||
|distribution=Ala. | |distribution=Ala. | ||
| − | |discussion=<p>James Allison (in protologue) suggested that Silphium perplexum is a hybrid between S. glutinosum and S. integrifolium. It has glandular hairs on its stems, leaves, and phyllaries as in S. glutinosum; it is also found on chalk, has taller stems, larger leaf blades, and deeper yellow corollas. Further study is needed to determine its status.</p> | + | |discussion=<p>James Allison (in protologue) suggested that <i>Silphium</i> perplexum is a hybrid between <i>S. glutinosum</i> and <i>S. integrifolium</i>. It has glandular hairs on its stems, leaves, and phyllaries as in <i>S. glutinosum</i>; it is also found on chalk, has taller stems, larger leaf blades, and deeper yellow corollas. Further study is needed to determine its status.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=2001 | |publication year=2001 | ||
|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_187.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | ||
Revision as of 15:32, 18 September 2019
Plants caulescent 80–150(–180) cm; fibrous rooted. Stems terete, scabrous, stipitate-glandular. Leaves: basal caducous; cauline usually opposite, rarely alternate, petiolate or sessile; blades lanceolate to ovate, 3–22 × 1–12 cm, bases attenuate to rounded, margins toothed or entire, apices acute to acuminate, faces scabrous, stipitate-glandular. Phyllaries 19–23 in 3–4 series, outer appressed to reflexed, apices acute to obtuse, abaxial faces scabrous, stipitate-glandular. Ray florets 8–16; corollas pale yellow. Disc florets 50–70; corollas pale yellow. Cypselae 6–8.5 × 4–7 mm; pappi 0.5–2 mm. 2n = 14.
Phenology: Flowering summer–early fall.
Habitat: Limestone glades, along rocky streams
Elevation: 100–300 m
Discussion
James Allison (in protologue) suggested that Silphium perplexum is a hybrid between S. glutinosum and S. integrifolium. It has glandular hairs on its stems, leaves, and phyllaries as in S. glutinosum; it is also found on chalk, has taller stems, larger leaf blades, and deeper yellow corollas. Further study is needed to determine its status.
Selected References
None.