Flaveria bidentis
Flaveria chlorifolia
coastal plain yellowtops
clasping yellowtops
erect.
erect to subdecumbent.
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 oblong-ovate to lanceolate or hastate, (20–)30–100 × 10–40(–50) mm, bases connate-perfoliate, margins entire.
oblong-angular, 5 mm.
oblong-urceolate, 5–7 mm.
0 or 1;
laminae pale yellow, ovate-oblique, to 1 mm (not or barely surpassing phyllaries).
0.
(2–)3–8;
corolla tubes ca. 0.8 mm, throats funnelform, 0.8 mm.
9–14;
corolla tubes 1.2–1.4 mm, throats narrowly funnelform, 2 mm.
3(–4), oblong.
5, oblong-lanceolate.
of 1–2 linear bractlets 1–2 mm.
of 1(–2) linear-lanceolate bractlets ca. 2 mm.
20–100+ in tight subglomerules in scorpioid, cymiform arrays.
25–150+ in paniculiform arrays.
oblanceolate or subclavate, 2–2.5 mm (those of ray florets longer);
pappi 0.
narrowly oblanceolate to linear, 2.5–3 mm;
pappi usually of 2–4 unequal, hyaline scales 0.2–1 mm, usually on 1 shoulder, rarely 0.
= 36.
= 36.
Flaveria bidentis
Flaveria chlorifolia
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 chlorifolia is widely distributed in the northern region of the Chihuahuan Desert and extends up the Pecos River drainage into central New Mexico and the Rio Grande River drainage to north of Las Cruces. The perfoliate leaves, succulent habit, relatively large, flat-topped clusters of discoid heads, and usually 2–4 pappus scales distinguish it. It may be considered primitive on the basis of habit, leaves, and pappus scales. It is not thought to be closely related to any other species of Flaveria.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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