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Euthamia caroliniana (L.) Greene ex Porter & Britton

Slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderAsteralesFlowering plants with a central disk flower and surrounding petals, like daisies
FamilyAsteraceaeThe aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
GenusEuthamiaGreek for “well-crowded,” from the dense flowerheads
Speciescaroliniana“From the Carolinas”

About plant names...

Slender goldentop, also known as coastal plain flat-topped goldenrod, is a North American native. It is not, however, a true goldenrod, though it is often classified as such. For a comparison table of goldenrods and similar species, see Solidago.

Identification: Plants are 10-39″ (25-100 cm) in height. Stems are branched partway up, smooth, without a waxy bluish coating (technically, glabrous or glabrate, not glaucous). Leaves are linear, like grass blades, abundant, and typically bent downward or backward (deflexed). They are ⅞-2½″ (2.4-7 cm) long and 1/32-⅛″ (1-3 mm) wide, rarely up to ⅛″ (6 mm) wide and smooth, especially at maturity. Leaves have resinous dots. The flowerheads are flat-topped or rounded, often multiply layered, with tiny yellow flowers, blooming from Aug-Dec.

Some Euthamias are listed below. This genus is in taxonomic flux, so the names are likely to change:

 

Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

8/25/2013 · Casalis State Forest, Elm Hill Rd, Peterborough, New Hamp­shire · ≈ 8 × 5″ (19 × 13 cm) ID is uncertain

Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

7/31/2021 · Otter Brook Preserve, Harpswell, Maine · ≈ 11 × 7″ (26 × 18 cm)

Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

8/25/2013 · Casalis State Forest, Elm Hill Rd, Peterborough, New Hamp­shire · ≈ 8 × 6″ (20 × 14 cm) ID is uncertain

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Euthamia caroliniana

Euthamia graminifolia
Common Name

slender goldentop

flat-top goldentop
Plant 10-39″ (25-100 cm) in height. 1-4′ (30-121 cm) tall, often branched only slightly, sometimes heavily-branched and bushy.
Flowers Flowerheads are flat-topped or rounded, often multiply layered, with tiny yellow flowers, blooming from Aug-Dec. Large, flat-topped or umbrella-shaped yellow flower clusters. Each flower in the flowerhead is ⅛″ (3.2 mm) across. Flowerheads tend to bloom gradually, not all at once, emitting a modest, sweet scent.
Leaves

 

Linear, like grass blades, abundant, typically bent downward or backward (deflexed). ⅞-2½″ (2.4-7 cm) long and 1/32-⅛″ (1-3 mm) wide, (up to ⅛″ (6 mm)) and smooth. Leaves have resinous dots.
Lance-shaped leaves contain 3 veins running along the length of the vein. Sometimes there is 1 or 5 veins, depending on leaf size. Leaves are 3-6″ (7.6-15 cm) × ⅛-⅝″ (3.2-15 mm), resembling grass blades, and attached directly to the stem ("sessile"). Leaves have resinous dots.
Stem Stems are branched partway up, smooth, without a waxy bluish coating (technically, glabrous or glabrate, not glaucous). Stems typically have rows of fine white hairs.
Range/ Zones

Type Wild Wild

 

Online References:

The Lady Bird Johnson Wildflower Center

EFloras

References:

Clemants, Steven; Gracie, Carol, Wildflowers in the Field and Forest, Oxford University Press, 2006, p, 158

Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

8/25/2013 · Casalis State Forest, Elm Hill Rd, Peterborough, New Hamp­shire · ≈ 8 × 5″ (19 × 13 cm) ID is uncertain

Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

8/7/2010 · Nashua River Rail Trail, near Nashoba Hospital, Ayer, Mass­a­chu­setts · ≈ 14 × 9″ (35 × 23 cm) ID is uncertain

Euthamia microcephala Greene

Euthamia microphylla Greene

Euthamia minor (Michx.) Greene

Euthamia tenuifolia (Pursh) Nutt.

Euthamia tenuifolia (Pursh) Nutt. var. tenuifolia

Solidago caroliniana (L.) Britton, Sterns & Poggenb.

Solidago minor (Michx.) Fernald

Solidago microphylla (Greene) Bush

Solidago microcephala (Greene) Bush

Solidago tenuifolia Pursh

 

Euthamia caroliniana description by Thomas H. Kent, last updated 16 Sep 2020.

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Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

8/7/2010 · Nashua River Rail Trail, near Nashoba Hospital, Ayer, Mass­a­chu­setts ID is uncertain

Euthamia caroliniana (slender goldentop, slender fragrant goldenrod, coastal plain flat-topped goldenrod)

8/7/2010 · Nashua River Rail Trail, near Nashoba Hospital, Ayer, Mass­a­chu­setts · ≈ 16 × 11″ (40 × 26 cm) ID is uncertain

Range:

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