Flaveria trinervia
Flaveria chlorifolia
cluster yellow tops
clasping yellowtops
erect.
erect to subdecumbent.
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 oblong-ovate to lanceolate or hastate, (20–)30–100 × 10–40(–50) mm, bases connate-perfoliate, margins entire.
oblong and cylindric or angular, 3.8–4.5 mm.
oblong-urceolate, 5–7 mm.
0–1;
laminae pale yellow or whitish, oblique or suborbiculate, 0.5–1 mm.
0.
0–1(–2);
corolla tubes 0.5–1.4 mm, throats campanulate, 0.5–0.8 mm.
9–14;
corolla tubes 1.2–1.4 mm, throats narrowly funnelform, 2 mm.
usually 2, oblong (closely investing and falling with mature cypselae).
5, oblong-lanceolate.
0.
of 1(–2) linear-lanceolate bractlets ca. 2 mm.
30–300+, in tight, axillary, sessile glomerules (receptacles of glomerules setose).
25–150+ in paniculiform arrays.
oblanceoloid to subclavate, 2–2.6 mm (rays 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 trinervia
Flaveria chlorifolia
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 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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