

How to identify Lance-leaved coreopsis (Coreopsis lanceolata)
Lance-leaved coreopsis, also known as Garden coreopsis, Lance coreopis
Lance-leaved coreopsis is characterized by an upright herbaceous growth reaching up to 2 feet (60 cm) in height. It possesses narrow, opposing leaves that may exhibit one to two linear side lobes. This species is easily recognized by its flower heads, each displaying a single row of eight ray flowers. The distinct ray flowers are a vibrant yellow color and feature a unique notched appearance at their apex. The foliage of lance-leaved coreopsis is lance-shaped, aligning with its specific name.
Upright growth reaching 2 feet (60 cm) with lance-shaped leaves and distinct yellow flower heads.
Bright yellow flowers in single row, 1.5-2.5 inches (3.8-6.4 cm) wide, with notched petals.
Dry, single-seeded cypselae fruits lacking pappus awns, varying in color from green to brown.
Opposite, narrow to spatulate leaves with 1-2 small lobes, 3-4 inches (7.6-10.2 cm) long.
Smooth, slender green stem, 0.1-0.2 inches (2-5 mm) diameter, with minimal branching towards top.
The leaves of lance-leaved coreopsis are opposite, simple, and range from linear to lanceolate to oblanceolate-linear to narrow spatulate shapes. Occasionally, they may have 1-2 small lateral lobes. The leaves measure approximately 3-4 inches (7.6-10.2 cm) long and 1-3 inches (2.5-7.6 cm) wide, with entire to lobed margins. They exhibit an attenuate form, seemingly lacking a distinct petiole, contributing to their slender and elongated appearance.
Lance-leaved coreopsis flowers are characterized by bright yellow petals arranged in a single row, with each head measuring 1.5-2.5 inches (3.8-6.4 cm) in diameter. Typically, there are about eight obovate ray flowers with a distinct notch at the apex, surrounding numerous yellow disc flowers at the center. The flowers are borne on elongated peduncles and bloom from April to June, making them a vibrant sight during spring and early summer.
The stem of lance-leaved coreopsis is smooth, round, and green, typically measuring about 0.1-0.2 inches (2-5 mm) in diameter. It is slender with minimal hair, showcasing a firm, yet flexible texture. The stems are erect and may branch towards the top, supporting the plant's growth. These stems are typically unmarked by prominent nodes, displaying a uniform appearance that aids in identifying lance-leaved coreopsis. Their structure supports the flowering heads efficiently, offering both stability and flexibility.
The fruit of lance-leaved coreopsis is categorized as a cypsela, a type of dry, single-seeded fruit. These fruits typically lack pappus awns, which in other species function like parachutes to aid in dispersal. Instead, these cypselae have a smooth texture that may cling to fibers and skin. They are small and inconspicuous, likely varying in color from green to brown as they mature. The shape is typically narrow and elongated. These fruits become prominent and are likely to be observed from May to July when the plant displays its seed maturity.
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Scientific Classification of Lance-leaved coreopsis