Difference between revisions of "Eutrochium purpureum"

(Linnaeus) E. E. Lamont

Sida 21: 902. 2004.

Common names: Sweetscented or sweet joepyeweed
Basionym: Eupatorium purpureum Linnaeus
Synonyms: Eupatoriadelphus purpureus (Linnaeus) R. M. King & H. Robinson
Treatment appears in FNA Volume 21. Treatment on page 477. Mentioned on page 475.
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|distribution=North America.
 
|distribution=North America.
 
|discussion=<p>Varieties 2 (2 in the flora).</p><!--
 
|discussion=<p>Varieties 2 (2 in the flora).</p><!--
--><p>Eutrochium purpureum is morphologically variable and is known to hybridize with all other species in the genus (E. E. Lamont 1995). Historically, more than a dozen infraspecific taxa have been recognized; the extent of intergradation and the lack of correlation among varying traits tend to make recognition of more than two varieties impractical.</p>
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--><p><i>Eutrochium purpureum</i> is morphologically variable and is known to hybridize with all other species in the genus (E. E. Lamont 1995). Historically, more than a dozen infraspecific taxa have been recognized; the extent of intergradation and the lack of correlation among varying traits tend to make recognition of more than two varieties impractical.</p>
 
|tables=
 
|tables=
 
|references=
 
|references=
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|publication year=2004
 
|publication year=2004
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V21_1197.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V21_1197.xml
 
|tribe=Asteraceae tribe Eupatorieae
 
|tribe=Asteraceae tribe Eupatorieae
 
|genus=Eutrochium
 
|genus=Eutrochium

Revision as of 15:30, 18 September 2019

Plants 30–200 cm. Stems usually dark purple at nodes, usually otherwise greenish, rarely purplish green, usually solid, rarely ± hollow near bases, glabrous proximally, ± glandular-puberulent distally and among heads. Leaves mostly in 3s–4s(–5s); petioles 5–15(–20) mm, glabrous or sparingly puberulent, rarely ciliate; blades pinnately veined, lance-ovate or ovate to deltate-ovate, mostly (7–)9–26(–30) × (2.5–)3–15(–18) cm, bases abruptly or gradually tapered, margins coarsely serrate, abaxial faces sparingly and minutely gland-dotted and densely pubescent to glabrate, adaxial faces sparingly puberulent and glabrescent or glabrous. Heads in loose, convex, compound corymbiform arrays. Involucres often purplish, 6.5–9 × 2.5–5 mm. Phyllaries usually glabrous, sometimes sparsely hairy. Florets (4–)5–7(–8); corollas usually pale pinkish or purplish, 4.5–7 mm. Cypselae 3–4.5 mm.

Discussion

Varieties 2 (2 in the flora).

Eutrochium purpureum is morphologically variable and is known to hybridize with all other species in the genus (E. E. Lamont 1995). Historically, more than a dozen infraspecific taxa have been recognized; the extent of intergradation and the lack of correlation among varying traits tend to make recognition of more than two varieties impractical.

Selected References

None.

Key

1 Leaves: abaxial faces usually glabrous, sometimes sparsely to densely hairy along major veins (hairs fine, simple, 1-cellular); s New Hampshire to n Florida, w to se Minnesota, Iowa, and e Oklahoma Eutrochium purpureum var. purpureum
1 Leaves: abaxial faces densely and persistently puberulent to villous; s Minnesota, Iowa, and ne Kansas to s Wisconsin, n Illinois, and n Missouri Eutrochium purpureum var. holzingeri