Flaveria trinervia
cluster yellow tops
erect.
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.
oblong and cylindric or angular, 3.8–4.5 mm.
0–1;
laminae pale yellow or whitish, oblique or suborbiculate, 0.5–1 mm.
0–1(–2);
corolla tubes 0.5–1.4 mm, throats campanulate, 0.5–0.8 mm.
usually 2, oblong (closely investing and falling with mature cypselae).
0.
30–300+, in tight, axillary, sessile glomerules (receptacles of glomerules setose).
oblanceoloid to subclavate, 2–2.6 mm (rays longer);
pappi 0.
= 36.
Flaveria trinervia
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.)
CA
Go Botany
MO Plants
WildflowerSearch
iNaturalist
USDA Plants Database
