Difference between revisions of "Eutrochium"
New Fl. 4: 78. 1838.
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--><p>Detailed distribution maps for taxa of <i>Eutrochium</i> are available but treated as taxa under <i>Eupatorium</i> (E. E. Lamont 1995).</p> | --><p>Detailed distribution maps for taxa of <i>Eutrochium</i> are available but treated as taxa under <i>Eupatorium</i> (E. E. Lamont 1995).</p> | ||
|tables= | |tables= | ||
− | |references= | + | |references={{Treatment/Reference |
+ | |id=lamont1995a | ||
+ | |text=Lamont, E. E. 1995. Taxonomy of Eupatorium section Verticillata (Asteraceae). Mem. New York Bot. Gard. 72: 1–66. | ||
+ | }}{{Treatment/Reference | ||
+ | |id=mackenzie1920a | ||
+ | |text=Mackenzie, K. K. 1920. Scientific names applicable to our purple-flowered eupatoriums. Rhodora 22: 157–165. | ||
+ | }}{{Treatment/Reference | ||
+ | |id=wiegand1937a | ||
+ | |text=Wiegand, K. M. and C. A. Weatherby. 1937. The nomenclature of the verticillate eupatoria. Rhodora 39: 297–306. | ||
+ | }} | ||
}}<!-- | }}<!-- | ||
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|family=Asteraceae | |family=Asteraceae | ||
|distribution=North America. | |distribution=North America. | ||
− | |reference= | + | |reference=lamont1995a;mackenzie1920a;wiegand1937a |
|publication title=New Fl. | |publication title=New Fl. | ||
|publication year=1838 | |publication year=1838 | ||
|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/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_1190.xml |
|tribe=Asteraceae tribe Eupatorieae | |tribe=Asteraceae tribe Eupatorieae | ||
|genus=Eutrochium | |genus=Eutrochium |
Revision as of 20:33, 16 December 2019
Perennials, 30–350+ cm. Stems (sometimes ± purple, sometimes glaucous, internodes usually shorter than leaves) erect, unbranched. Leaves mostly cauline; mostly whorled (3–7 per node), rarely opposite; petiolate; blades pinnately veined or ± 3-nerved from at or near bases, deltate-ovate, lance-elliptic, lanceolate, lance-ovate, or ovate (bases gradually or abruptly tapered), margins serrate (usually with gland at apex of each tooth, apices acuminate), abaxial faces usually gland-dotted and hirsute, puberulent, pubescent, scabrous, or stipitate-glandular, sometimes glabrate, adaxial faces mostly puberulent to scabrous-hirsute and glabrescent, sometimes glabrate or glabrous. Heads discoid, in (flat-topped or convex to rounded) compound, corymbiform arrays. Involucres cylindric, 2.5–7 mm diam. Phyllaries persistent, 10–22 in 5–6 series, (pale pink to purple, rarely white, tightly appressed) striate or 1-nerved, mostly lance-ovate to lanceolate, unequal (outer 2–3 obtuse, densely pubescent or glabrescent, often gland-dotted, innermost glabrous or glabrescent). Receptacles flat or convex, epaleate. Florets 4–22; corollas usually purplish or pinkish, rarely white, throats funnelform, lobes 5, ovate to deltate; styles: bases enlarged, puberulent, branches ± filiform to clavate (slightly dilated or flattened distally, papillose). Cypselae (dark brown to black or yellowish brown) prismatic, 5-ribbed, usually gland-dotted, sometimes scabrellous on ribs; pappi persistent, of 25–40 (cream to pinkish purple) barbellate bristles in 1 series. x = 10.
Distribution
North America.
Discussion
Species 5 (5 in the flora).
Detailed distribution maps for taxa of Eutrochium are available but treated as taxa under Eupatorium (E. E. Lamont 1995).
Selected References
Lower Taxa
Key
1 | Leaves usually ± 3-nerved and bases of blades abruptly contracted to petioles; florets (4–)5–9(–10) (near coast from South Carolina to New Hampshire and Nova Scotia) | Eutrochium dubium |
1 | Leaves either pinnately veined or bases of blades gradually narrowed to petioles or both; florets 4–10 or 8–22 | > 2 |
2 | Heads in ± flat-topped arrays; florets 8–22 | Eutrochium maculatum |
2 | Heads in convex to rounded arrays; florets 4–10 | > 3 |
3 | Stems usually glandular-pubescent throughout, sometimes densely puberulent and sparingly glandular; abaxial leaf faces ± glandular-pubescent and sparsely hirsute; s Appalachian Mountains of sw Virginia, e Kentucky, e Tennessee, and w NorthCarolina | Eutrochium steelei |
3 | Stems glabrous proximal to heads; abaxial leaf faces sparingly and minutely gland-dotted; relatively widespread in e North America | > 4 |
4 | Stems purple at nodes, usually solid, rarely ± hollow near bases | Eutrochium purpureum |
4 | Stems purplish throughout (and glaucous), hollow | Eutrochium fistulosum |