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Published In: Species Plantarum 2: 908. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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2. Coreopsis lanceolata L. (tickseed coreopsis)

C. lanceolata var. villosa Michx.

Pl. 275 a, b; Map 1161

Plants perennial, with a short, horizontal rootstock. Stems 20–60 cm long (taller in cultivated races), glabrous or sparsely to moderately pubescent with spreading hairs, especially toward the base. Leaves confined to 1–3(–5) nodes (occasionally more in cultivated forms) mostly in the lower half of the plant, the uppermost leaves sessile, the basal and lowermost stem leaves mostly long-petiolate. Leaf blades 2.5–12.0 cm long, narrowly oblanceolate or narrowly elliptic to ovate or oblong-ovate in outline, unlobed or with 1 or 2(–5) deep basal (pinnate) lobes or divisions, in entire leaves the blade angled to long-tapered at the base, in divided leaves, the lateral lobes or divisions much shorter than the terminal lobe or division, 2–9 mm wide, linear, narrowly oblong, or elliptic, more or less narrowed toward the base, angled or tapered to a usually sharply pointed tip, the surfaces glabrous or sparsely to moderately pubescent with short, spreading hairs. Inflorescences of solitary heads or appearing as loose, open clusters, the heads with the stalk mostly 8–40 cm long. Involucre with the outer series of bracts 5–10 mm long; the inner series of bracts 9–12 mm long. Chaffy bracts narrowly triangular, long-tapered from an abruptly broadened, flat basal portion to a sharply pointed tip. Ray florets with the corolla 15–30 mm long, with 3–5 deep, sometimes irregular (appearing jagged) teeth or lobes around the tip, uniformly yellow. Disc florets with the corollas 3.5–5.0 mm long, 5-lobed, yellow, sometimes with yellowish orange lobes. Style branches tapered abruptly to a sharply pointed, sterile tip. Pappus of 1 or 2 scalelike teeth 0.3–0.8 mm long. Fruits 2.5–4.0 mm long, the base and tip appearing curled or arched inward at maturity, the angles with broad, pale wings having entire or more commonly somewhat irregular margins, the inner face with a bulbous thickening at 1 or both ends, dark brown to black, 1 or both surfaces with numerous small, lighter-colored tubercles. 2n=26. April–July.

Scattered, mostly in the Ozark and Ozark Border Divisions; introduced elsewhere in the state (eastern U.S. west to Wisconsin and Texas; Canada; introduced in the western U.S.).

Steyermark (1963) maintained that plants encountered outside the Ozarks represented escapes from cultivation. The species also sometimes is planted along highways for roadside beautification. Smith (1976) examined specimens from throughout the range of this species and determined that none of the infraspecific taxa based on differences in leaf dissection and pubescence that had been accepted by some earlier authors were worthy of continued recognition.

 


 

 
 
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