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coastal plain yellowtops

Habit Annuals, to 100 cm (delicate or robust, sparsely villous).



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.


oblong-angular, 5 mm.

Ray florets

0 or 1;

laminae pale yellow, ovate-oblique, to 1 mm (not or barely surpassing phyllaries).

Disc florets


corolla tubes ca. 0.8 mm, throats funnelform, 0.8 mm.


3(–4), oblong.


of 1–2 linear bractlets 1–2 mm.


20–100+ in tight subglomerules in scorpioid, cymiform arrays.


oblanceolate or subclavate, 2–2.5 mm (those of ray florets longer);

pappi 0.


= 36.

Flaveria bidentis

Phenology Flowering year round.
Habitat Moist places, waste or disturbed ground, clay, gravel, or sand
Elevation 0–10 m (0–0 ft)
from FNA
AL; FL; GA; MA; Central America; South America; West Indies [Introduced in North America; also introduced in Europe (Great Britain) and Africa (Egypt and south)]
[BONAP county map]

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.)

Source FNA vol. 21, p. 249.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Flaveriinae > Flaveria
Sibling taxa
F. brownii, F. campestris, F. chlorifolia, F. floridana, F. linearis, F. mcdougallii, F. trinervia
Synonyms Ethulia bidentis
Name authority (Linnaeus) Kuntze: Revis. Gen. Pl. 3([3]): 148. (1898)
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