Euthamia graminifolia (L.) Nutt.
Flat-top Goldentop, Lance-leaved Goldenrod, Grass-leaved Goldenrod, Flat-topped Goldentop
Flat-top goldentop, or lance-leaved goldenrod, is a North American native. It has become naturalized in Europe and Asia. It is not a true goldenrod, though it is often classified as such, hence the name “goldentop” is now preferred. For a comparison table of goldenrods and similar species, see Solidago.
Identification: These plants are 12-48" (30-121 cm) tall, often branched only slightly, sometimes heavily-branched and bushy. Stems typically have rows of fine white hairs. 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. Large, flat-topped or umbrella-shaped yellow flower clusters appear atop each stem. Each flower in the flowerhead is only ⅛" (3.2 mm) across. Flowerheads tend to bloom gradually, not all at once, emitting a modest, sweet scent. (A similar species, Euthamia gymnospermoides or plains grass-leaved goldenrod, has only a single major vein in even the largest leaves, and hairless stems. Each flower consists of 12-20 tiny florets, vs. 21-35 in lance-leaved goldenrod.)
Some Euthamias are listed below. This genus is in taxonomic flux, so the names are likely to change:
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|Plant||10-39" (25-100 cm) in height.||12-48" (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.|
Euthamia graminifolia on Vascular Plants of the Gila Wilderness
Euthamia graminifolia at Illinois Wildflowers
Euthamia graminifolia at the University of Wisconsin's Robert W. Freckmann Herbarium
Euthamia graminifolia on Flora Pittsburghensis: Wild Flowers of Pittsburgh
Euthamia graminifolia on Ontario Wildflowers
Euthamia graminifolia on the Connecticut Botanical Society's Connecticut wildflowers site
Euthamia graminifolia at the Lady Bird Johnson Wildflower Center
Euthamia graminifolia on eFloras
Clemants, Steven; Gracie, Carol, Wildflowers in the Field and Forest, Oxford University Press, 2006, p, 158
Euthamia graminifolia description by Thomas H. Kent, last updated 25 Dec 2018.