''Euthamia'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s in the family

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

.Tropicos, Euthamia (Nutt.) Cass.
/ref> They are known as goldentops''Euthamia''.
USDA Plants. and grass-leaved goldenrods.''Euthamia'': Grass-leaved goldenrods.
Astereae Lab. University of Waterloo. The species were formerly classed in genus ''

Solidago ''Solidago'', commonly called goldenrods, is a genus of about 100 to 120''Solidago''.
F ...

''. They were separated on the basis of morphological differences, such as the arrangement of the

flower heads A pseudanthium (; : pseudanthia) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, composite flowers ...

in the inflorescence and the glands on the leaves, and of DNA data.''Euthamia''.
Flora of North America. Authors have recognized 5 to 10 species. They are native to North America, but certain species are introduced in Europe and Asia. These species are quite variable in appearance, the variation often influenced by environmental conditions. In general, they are

rhizomatous In botany and dendrology, a rhizome ( ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow hori ...

perennial herbs or

subshrubs A subshrub (Latin ''suffrutex'') or undershrub is either a small shrub (e.g. prostrate shrubs) or a perennial that is largely herbaceous but slightly woody plant, woody at the base (e.g. garden pink and florist's chrysanthemum). The term is ofte ...

growing erect stems 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 In botanical terminology, a phyllary, also known an involucral bract or tegule, is a single bract of the involucre of a composite flower. The involucre is the grouping of bracts together. Phyllaries are reduced leaf-like structures that form one o ...

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. ''Euthamia'' species are used as food plants by the

larva A larva (; : larvae ) is a distinct juvenile form many animals undergo before metamorphosis into their next life stage. Animals with indirect development such as insects, some arachnids, amphibians, or cnidarians typically have a larval phase ...

e of some

Lepidoptera Lepidoptera ( ) or lepidopterans is an order (biology), order of winged insects which includes butterflies and moths. About 180,000 species of the Lepidoptera have been described, representing 10% of the total described species of living organ ...

species including ''

Coleophora intermediella ''Coleophora intermediella'' is a moth of the family Coleophoridae. It is found in Canada, including Nova Scotia and New Brunswick New Brunswick is a Provinces and Territories of Canada, province of Canada, bordering Quebec to the north, No ...

'', which feeds exclusively on ''E. graminifolia''. ; SpeciesBiota of North America Program 2013 county distribution maps
/ref> * ''

Euthamia caroliniana ''Euthamia caroliniana'', known as Carolina grass-leaved goldenrod or slender goldentop is a flowering plant in the genus ''Euthamia'', a member of the family Asteraceae. It is listed as Vulnerable due to habitat loss and disturbance within its ra ...

'' (syn. ''E. tenuifolia'') – coastal plain goldentop, slender goldentop – Coastal Plain from Texas to Nova Scotia; also Great lakes region * ''

Euthamia graminifolia ''Euthamia graminifolia'', the grass-leaved goldenrod or flat-top goldenrod, is a North American species of plants in the family Asteraceae. It is native to much of Canada (from Newfoundland to British Columbia), and the northern and eastern Uni ...

'' – common goldentop, flat-top goldentop – northern + eastern US, mostly Great Lakes and Northeast; much of Canada * ''

Euthamia gymnospermoides ''Euthamia gymnospermoides'', with the common names Great Plains goldentop and Texas goldentop, is a plant in the family Asteraceae. It is native primarily to the Great Plains and Great Lakes Region where it is found in prairies and sandy areas. ...

'' – Great Plains goldentop, Texas goldentop – Great Plains + Great Lakes from Texas to Ontario * ''

Euthamia leptocephala ''Euthamia leptocephala'', the bushy goldentop or Mississippi Valley goldentop, is a North American species of plants in the family Asteraceae. It is native to the south-central United States, in the lower Mississippi Valley and the Coastal Plain ...

'' – Mississippi Valley goldentop, bushy goldentop – south-central US, Texas to Georgia to Illinois * ''

Euthamia minor ''Euthamia graminifolia'', the grass-leaved goldenrod or flat-top goldenrod, is a North American species of plants in the family Asteraceae. It is native to much of Canada (from Newfoundland to British Columbia), and the northern and eastern Uni ...

'' – southeastern US * ''

Euthamia occidentalis ''Euthamia occidentalis'' is a flowering plant, known by the common names western flat topped goldenrod, western goldentop and western goldenrod, in the family Asteraceae. Description ''Euthamia occidentalis'' is a scrubby perennial plant with m ...

'' – western goldentop, western goldenrod – western Canada, western half of US, northwestern Mexico

References

{{Taxonbar, from=Q5226884 Asteraceae genera Flora of Northern America Taxa named by Henri Cassini