Euthamia

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Astereae
Subtribus: Solidagininae
Genus: Euthamia
Species: E. caroliniana – E. graminifolia – E. gymnospermoides – E. leptocephala – E. occidentalis
Source(s) of checklist:

Hassler, M. 2018. Euthamia. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Mar. 19. Reference page.

Name

Euthamia (Nutt.) Cass.
Synonyms

Solidago subg. Euthamia Nutt.

References

Cass., Dictionnaire des Sciences Naturelles, ed. 2, 37: 471. 1825.

Links

Hassler, M. 2018. Euthamia. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Mar. 19. Reference page.
International Plant Names Index. 2018. Euthamia. Published online. Accessed: Mar. 19 2018.
The Plant List 2013. Euthamia in The Plant List Version 1.1. Published on the internet. Accessed: 2018 Mar. 19.
Tropicos.org 2018. Euthamia. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Mar. 19.

Vernacular names
English: Goldentop

Euthamia is a genus of flowering plants in the aster family, Asteraceae.[2][3] They are known as goldentops[4] and grass-leaved goldenrods.[5][6]

The species were formerly classed in genus Solidago. They were separated on the basis of morphological differences, such as the arrangement of the flower heads in the inflorescence and the glands on the leaves, and of DNA data.[7] Authors have recognized 5 to 10 species.[5] They are native to North America, but certain species are introduced in Europe and Asia.[7]

These species are quite variable in appearance, the variation often influenced by environmental conditions. In general, they are rhizomatous perennial herbs or subshrubs growing erect stems 0.4–2 m (1 ft 4 in–6 ft 7 in) tall. The stems are hairy to hairless and branching or unbranched. The leaves are alternately arranged along the stem. They are linear to lance-shaped, smooth-edged, hairy to hairless, and gland-dotted, if sometimes sparsely. The flower heads are solitary or borne in a dense or spreading array. The back of the head is layered in phyllaries which may be resinous. There are 7 to 22 yellow ray florets, sometimes more, and several yellow disc florets. The fruit is a rough-textured cypsela tipped with a pappus of white bristles.[7]

Euthamia species are used as food plants by the larvae of some Lepidoptera species including Coleophora intermediella, which feeds exclusively on E. graminifolia.

Species[1][7][8][9]

Euthamia caroliniana (syn. E. tenuifolia) – coastal plain goldentop, slender goldentop – Coastal Plain from Texas to Nova Scotia; also Great lakes region
Euthamia graminifolia – common goldentop, flat-top goldentop – northern + eastern US, mostly Great Lakes and Northeast; much of Canada
Euthamia gymnospermoides – Great Plains goldentop, Texas goldentop – Great Plains + Great Lakes from Texas to Ontario
Euthamia leptocephala – Mississippi Valley goldentop, bushy goldentop – south-central US, Texas to Georgia to Illinois
Euthamia minor – southeastern US
Euthamia occidentalis – western goldentop, western goldenrod – western Canada, western half of US, northwestern Mexico

References

Flann, C (ed) 2009+ Global Compositae Checklist
Cassini, Alexandre Henri Gabriel de, in Cuvier, F. 1825. Dictionnaire des sciences naturelles, dans lequel on traite méthodiquement des différens êtres de la nature, considérés soit en eux-mêmes, d'après l'état actuel de nos connoissances, soit relativement à l'utilité qu'en peuvent retirer la médecine, l'agriculture, le commerce et les artes. Suivi d'une biographie des plus célèbres naturalistes, Second edition. 37: 471–472 in French
Tropicos, Euthamia (Nutt.) Cass.
Euthamia. USDA Plants.
Euthamia: Grass-leaved goldenrods. Astereae Lab. University of Waterloo.
Euthamia. The Jepson eFlora 2013.
Euthamia. Flora of North America.
Euthamia. ITIS.
Biota of North America Program 2013 county distribution maps