Flaveria bidentis
Flaveria linearis
coastal plain yellowtops
narrowleaf yellowtops
erect.
erect.
petiolate (proximal, petioles 3–15 mm) or sessile (distal);
blades lanceolate-elliptic, 50–120(–180) × 10–25(–70) mm, bases (distal) connate, margins serrate or spinulose serrate.
sessile;
blades linear, 50–100(–130) × 1–4(–15) mm, ± connate, margins entire or spinulose-serrulate.
oblong-angular, 5 mm.
oblong-angular, 3.3–4.5 mm.
0 or 1;
laminae pale yellow, ovate-oblique, to 1 mm (not or barely surpassing phyllaries).
0 or 1;
laminae yellow, oval to obovate-spatulate, 2–3 mm.
(2–)3–8;
corolla tubes ca. 0.8 mm, throats funnelform, 0.8 mm.
(2–)5–7(–8);
corolla tubes 0.8–1.2 mm, throats basally tubular, becoming funnelform-campanulate apically, 1–1.5 mm.
3(–4), oblong.
5(–6), linear or oblong.
of 1–2 linear bractlets 1–2 mm.
of 1–3 linear bractlets 1–2.5 mm.
20–100+ in tight subglomerules in scorpioid, cymiform arrays.
10–150+, in clusters in corymbiform-paniculiform arrays.
oblanceolate or subclavate, 2–2.5 mm (those of ray florets longer);
pappi 0.
linear, 1.2–1.8 mm;
pappi 0.
= 36.
= 36.
Flaveria bidentis
Flaveria linearis
In the United States, Flaveria bidentis often occurs on ballast and waste ground near wharfs and the shore, locations that suggest its introduction from sailing vessels. The species is widespread and well established in South America, where it is thought to be native. Its floral structure appears to be the least advanced among the annual species of Flaveria, the heads being in somewhat scorpioid arrays. Distinguishing characteristics are 3(–4) phyllaries, 2–8 florets per head, reduced ray corollas, pubescent stems, and lanceolate-elliptic, bluish green, sometimes pubescent leaves. Flaveria bidentis is probably most closely related to F. campestris and F. trinervia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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