Flaveria trinervia
Asteraceae tribe Heliantheae subtribe Flaveriinae
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.
cauline; opposite; petiolate or sessile;
blades (1- or 3-nerved) oblong, oblong-ovate, lanceolate, linear, or filiform, margins entire or toothed, faces glabrous, glabrescent, or puberulent.
oblong and cylindric or angular, 3.8–4.5 mm.
campanulate, cylindric, obconic, turbinate, or urceolate.
flat to convex, epaleate.
0–1;
laminae pale yellow or whitish, oblique or suborbiculate, 0.5–1 mm.
0, or 1–6, pistillate, fertile;
corollas yellow.
0–1(–2);
corolla tubes 0.5–1.4 mm, throats campanulate, 0.5–0.8 mm.
1–60[–100+], bisexual, fertile;
corollas yellow, tubes shorter than or about equaling the funnelform to campanulate throats, lobes 5, deltate;
anther thecae pale;
stigmatic papillae in 2 lines.
usually 2, oblong (closely investing and falling with mature cypselae).
persistent, 2–8 in ± 1 series (distinct, linear to oblong, subequal, ± succulent to membranous or scarious).
0.
0 or of 1–2 bractlets.
30–300+, in tight, axillary, sessile glomerules (receptacles of glomerules setose).
radiate or discoid, in glomerules or corymbiform to paniculiform arrays.
oblanceoloid to subclavate, 2–2.6 mm (rays longer);
pappi 0.
cylindric to clavate or ± compresssed, linear-oblong to oblanceolate, 10–15-ribbed, glabrous or hairy;
pappi 0, or persistent, coroniform, or of 2–5 ovate, scarious scales, or of 20–25+ unequal bristles, or of 5 scales plus 5 bristles (all in 1 series, sometimes connate).
= 36.
Flaveria trinervia
Asteraceae tribe Heliantheae subtribe Flaveriinae
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.)
Genera 3, species 27 (3 genera, 10 species in the flora).
As noted by H. Robinson (1981), traditionally, Flaveria and Sartwellia were treated in Helenieae, Haploësthes in Senecioneae.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Disc florets 18–30(–60); pappi of 20–25+ bristles | Haploësthes |
1. Disc florets 1–15; pappi 0, or coroniform, or wholly or partly of scales | → 2 |
2. Ray florets 3–5; pappi of 5 erose scales alternating with 5 setiform scales or bristles (sometimes all 10 elements basally connate) | Sartwellia |
2. Ray florets 0 or 1; pappi 0, or coroniform, or of 2–4 hyaline scales | Flaveria |
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