This week, I’m featuring Flat-topped Goldentop (Euthamia graminifolia) as one of our local wildflowers that begins to bloom at this time.
Due to the similarity in its inflorescence, this plant was once considered a Goldenrod and another common name is Grass-leaved Goldenrod. In 1818, Thomas Nuttall proposed Euthamia as a subspecies of Solidago, but in 1840 declared it as a distinct species. This separation was largely based on morphological differences, such as the arrangement of the flower heads in the inflorescence and the presence of glands on the leaves. Subsequently, DNA evidence further revealed that these genera are closely related, but should be separate.
Identification Tips:
This herbaceous perennial plant is 2-3½’ tall. Stems are unbranched on the lower stem, but typically have few to many erect, leafy branches in the upper plant, creating a bushy crown. The slender stems usually have lines of fine white hairs.
The alternate leaves are linear and have smooth margins. The larger leaves have 3 conspicuous veins, although the smaller ones usually have only a single conspicuous vein. They are up to 4″ long and 3/8″ across, or slightly wider. Sometimes there are a few white hairs near the base of the leaves and along the central vein on the underside.
There are clusters of small composite flowers at the top of the plant and many of the upper side stems. The clusters are about 1¼″ wide and have of 20 to 35 mostly stalkless flower heads. Together they form a broad inflorescence up to 11″ wide that usually appears flat topped.
Each composite flower is yellow, consisting of about 21-35 disk florets and ray florets; it is only about 1/8″ across. The color of the blossoms is a lighter canary yellow rather than the darker, more golden color of a true Goldenrod. These compound flowers often bloom gradually, rather than simultaneously, with older flowers turning brown while younger flowers are still in the bud stage. Sometimes there is a mild floral scent.
The tiny seed (~0.5 mm long) is a hard, pubescent, one-seeded, white nutlet. The seed is attached to hair-like bristles (pappus).
Culinary and Medicinal Uses:
Flat-topped Goldentop, and as with all Goldenrods, may be used in herbal teas (also called tisanes).
An infusion of the dried powdered herb can be used as an antiseptic. A decoction of the root has been used in the treatment of chest pains and lung problems. An infusion of the blossoms has been used in the treatment of some types of fevers.
Wildlife Value:
The small flowers attract many kinds of insects, including long-tongued bees, short-tongued bees, wasps, flies, butterflies, moths, and beetles. Various wasps and a few beetle species, such as Goldenrod Soldier Beetle (Chauliognathus pennsylvanicus) and Black Blister Beetle (Epicauta pensylvanica), seem to be especially attracted to the flowers. The European Honey Bee (Apis mellifera), Common Buckeye (Junonia coenia), and Eastern Carpenter Bee (Xylocopa virginica) are frequent visitors of the flower.
The seeds are eaten by the American Goldfinch (Spinus tristis) and Swamp Sparrow (Melospiza georgiana) to a limited extent, while the foliage is occasionally consumed in limited amounts by the Eastern Cottontail Rabbit (Sylvilagus floridanus) and White-Tailed Deer (Odocoileus virginianus).
Where Found Locally:
- 100 Acre Wood
- Anchor Diamond Park at Hawkwood
- Balsam Way Natural Area
- Community Connector Trail
- Dwaas Kill Nature Preserve
- Fox Preserve
- Garnsey Park
- Historic Champlain Canalway Trail
- North Woods Nature Preserve
- Peter Desrochers Memorial Country Knolls Trails
- Settlers Hill Natural Area
- Stillwater Multi-Use Trail
- Summer Hill Natural Area
- Veterans Bike Path
- Veterans Memorial Park
- West Sky Natural Area
- Zim Smith Trail