Flaveria trinervia
Flaveria brownii
cluster yellow tops
Brown's yellowtops
erect.
erect or decumbent.
petiolate (proximal, petioles 10–20 mm) or sessile (distal);
blades lanceolate or oblanceolate to elliptic or subovate, 30–150 × (7–)10–40 mm, bases (distal) connate, margins serrate, serrate-dentate, or spinulose-serrate.
sessile;
blades linear, 5–12 cm × 2–8 mm, bases barely connate, margins entire or weakly serrate.
oblong and cylindric or angular, 3.8–4.5 mm.
oblong-angular, 4–5 mm.
0–1;
laminae pale yellow or whitish, oblique or suborbiculate, 0.5–1 mm.
0 or 1;
laminae yellow, oblong-elliptic, 2 mm.
0–1(–2);
corolla tubes 0.5–1.4 mm, throats campanulate, 0.5–0.8 mm.
(5–)7–10;
corolla tubes 0.8–1.2 mm, throats funnelform, 1.2–1.5 mm (distal 1/2 expanded).
usually 2, oblong (closely investing and falling with mature cypselae).
5–6, boat-shaped (phyllaries enclosing ray florets conspicuously keeled).
0.
of 1–2 linear bractlets 1–2.5 mm.
30–300+, in tight, axillary, sessile glomerules (receptacles of glomerules setose).
20–100+, in ± open, paniculiform-corymbiform arrays.
oblanceoloid to subclavate, 2–2.6 mm (rays longer);
pappi 0.
linear, 1.5–2 mm (those of rays longer);
pappi 0.
= 36.
= 36.
Flaveria trinervia
Flaveria brownii
Flaveria trinervia is widespread and weedy; it often occurs in saline, gypseous, disturbed areas near permanent or ephemeral water sources in southern Florida and from Texas to southern California. It occurs also in scattered locations in some eastern states and has been reported from Alabama.
The heads of Flaveria trinervia, which usually contain just one floret, are either radiate or discoid; radiate heads tend to occur on the periphery of setose glomerules. Reduction of some of the floral features, including number of florets [0–1(–2)], phyllaries per head (2), and size of ray laminae, suggest that F. trinervia may be the most derived species in the genus.
(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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