Flaveria bidentis
Flaveria brownii
coastal plain yellowtops
Brown's yellowtops
erect.
erect or decumbent.
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, 5–12 cm × 2–8 mm, bases barely connate, margins entire or weakly serrate.
oblong-angular, 5 mm.
oblong-angular, 4–5 mm.
0 or 1;
laminae pale yellow, ovate-oblique, to 1 mm (not or barely surpassing phyllaries).
0 or 1;
laminae yellow, oblong-elliptic, 2 mm.
(2–)3–8;
corolla tubes ca. 0.8 mm, throats funnelform, 0.8 mm.
(5–)7–10;
corolla tubes 0.8–1.2 mm, throats funnelform, 1.2–1.5 mm (distal 1/2 expanded).
3(–4), oblong.
5–6, boat-shaped (phyllaries enclosing ray florets conspicuously keeled).
of 1–2 linear bractlets 1–2 mm.
of 1–2 linear bractlets 1–2.5 mm.
20–100+ in tight subglomerules in scorpioid, cymiform arrays.
20–100+, in ± open, paniculiform-corymbiform arrays.
oblanceolate or subclavate, 2–2.5 mm (those of ray florets longer);
pappi 0.
linear, 1.5–2 mm (those of rays longer);
pappi 0.
= 36.
= 36.
Flaveria bidentis
Flaveria brownii
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 brownii, which has radiate heads present among the discoid heads in each capitulescence, is superficially similar to the discoid F. oppositifolia. It occurs in the lower Gulf Coast region of Texas; the latter is Mexican.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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