Difference between revisions of "Parthenium argentatum"
in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 86. 1859.
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|elevation=1000–1500 m | |elevation=1000–1500 m | ||
|distribution=Tex.;Mexico. | |distribution=Tex.;Mexico. | ||
| − | |discussion=<p>Guayule has sometimes been used for commercial production of natural rubber. Hybrids between Parthenium argentatum and P. incanum have been noted.</p> | + | |discussion=<p>Guayule has sometimes been used for commercial production of natural rubber. Hybrids between <i>Parthenium argentatum</i> and <i>P. incanum</i> have been noted.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1859 | |publication year=1859 | ||
|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_33.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | ||
Revision as of 15:33, 18 September 2019
Shrubs, 30–100+ cm. Leaf blades lanceolate to oblanceolate, 15–25(–40+) × 6–15(–25+) mm, margins mostly entire, some with 1–2(–5) sharp teeth, faces densely strigillose (gray to white) and obscurely or not at all gland-dotted. Heads radiate, in glomerules of 3–5+ at ends of ± ebracteate stalks 8–15(–20+) cm. Peduncles 1–2(–6+) mm. Phyllaries: outer 5 oval-elliptic, 2.5–3+ mm, inner 5 ± orbiculate, 3.5–4 mm. Pistillate florets 5; corolla laminae ovate, 1.2–1.5 mm. Disc florets 20–30+. Cypselae ± obovoid, 2.5–3 mm; pappus-like enations 2(–4), erect to spreading, ± subulate, 0.3–0.8 mm. 2n = 36.
Phenology: Flowering Apr–Jun.
Habitat: Calcareous soils
Elevation: 1000–1500 m
Discussion
Guayule has sometimes been used for commercial production of natural rubber. Hybrids between Parthenium argentatum and P. incanum have been noted.
Selected References
None.