Difference between revisions of "Eutrochium dubium"
Sida 21: 901. 2004.
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GeoffLevin (talk | contribs) m (Deleted Eupatorium ternifolium Elliott as a synonym because it is a superfluous, illegitimate name that is a synonym of E. purpureum var. purpureum fide K. Gandhi) |
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|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eutrochium;Eutrochium dubium | |hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eutrochium;Eutrochium dubium | ||
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Eupatorieae]]</div><div class="higher-taxon"><small>genus</small>[[Eutrochium]]</div><div class="higher-taxon"><small>species</small>[[Eutrochium dubium]]</div></div> | |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Eupatorieae]]</div><div class="higher-taxon"><small>genus</small>[[Eutrochium]]</div><div class="higher-taxon"><small>species</small>[[Eutrochium dubium]]</div></div> | ||
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|rank=species | |rank=species | ||
|parent rank=genus | |parent rank=genus | ||
| − | |synonyms=Eupatoriadelphus dubius;Eupatorium americanum | + | |synonyms=Eupatoriadelphus dubius;Eupatorium americanum |
|basionyms=Eupatorium dubium | |basionyms=Eupatorium dubium | ||
|family=Asteraceae | |family=Asteraceae | ||
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|publication year=2004 | |publication year=2004 | ||
|special status=Endemic | |special status=Endemic | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1191.xml |
|tribe=Asteraceae tribe Eupatorieae | |tribe=Asteraceae tribe Eupatorieae | ||
|genus=Eutrochium | |genus=Eutrochium | ||
Latest revision as of 15:15, 23 August 2024
Plants 40–120(–170) cm. Stems usually purple-spotted, sometimes uniformly purple, solid, glabrous proximally, glandular-puberulent distally. Leaves mostly in 3s–4s; petioles 7–25 mm, glabrous; blades usually ± 3-nerved, rarely pinnately veined, deltate-ovate or ovate to lance-ovate, 5–16 × 2–8 cm, relatively thick and firm (often rugose), bases usually abruptly contracted to petioles, margins coarsely serrate, abaxial faces densely gland-dotted and sparingly hirsute (at least on midribs and main veins), adaxial faces scabrous, glabrescent. Heads usually in ± convex, sometimes flat-topped, corymbiform arrays. Involucres often purplish, 6.5–9 × 2.5–5 mm. Phyllaries glabrous or sparsely hairy. Florets (4–)5–9(–10); corollas usually dark purple, rarely pinkish or white, 4.5–7 mm. Cypselae 3–4.5 mm. 2n = 20.
Phenology: Flowering late summer–early fall.
Habitat: Moist habitats, in sandy or gravelly, acid soils, open sun or partial shade
Elevation: 0–50+ m
Distribution
N.S., Conn., Del., Maine, Md., Mass., N.H., N.J., N.Y., N.C., Pa., R.I., S.C., Vt., Va.
Discussion
Eutrochium dubium is restricted to the coastal plain, and inland along major river systems, of eastern North America. Identification of E. dubium has been difficult for field botanists, as evidenced by misidentified herbarium specimens. The most prominent character distinguishing E. dubium from its relatives (especially E. maculatum) is the 3-nerved leaf venation: the proximalmost pair of lateral veins are more prominent and more prolonged than the others. This character is best observed on abaxial leaf faces.
Selected References
None.