Narrowleaf Yellowtops

Flaveria linearis is variable; it typically has linear leaves, calyculi of relatively short, linear bractlets, and oblong-angular involucres. The heads are relatively small with 5–8 florets, and throats of the disc corollas are tubular at the base, abruptly expanding distally to become funnelform-campanulate. Plants of this species, the most common Flaveria in Florida, occur throughout most of the Florida peninsula, often near the coast.

Perennials, 30–80 cm (glabrous or pubescent, mostly on distal peduncles). Stems erect. Leaves sessile; blades linear, 50–100(–130) × 1–4(–15) mm, ± connate, margins entire or spinulose-serrulate. Heads 10–150+, in clusters in corymbiform-paniculiform arrays. Calyculi of 1–3 linear bractlets 1–2.5 mm. Involucres oblong-angular, 3.3–4.5 mm . Phyllaries 5(–6), linear or oblong. Ray florets 0 or 1; laminae yellow, oval to obovate-spatulate, 2–3 mm. Disc florets (2–)5–7(–8); corolla tubes 0.8–1.2 mm, throats basally tubular, becoming funnelform-campanulate apically, 1–1.5 mm. Cypselae linear, 1.2–1.8 mm; pappi 0. 2n = 36.

Flaveria ×latifolia (J. R. Johnston) R. W. Long & E. L. Rhamstine