Flora of North America species comparison

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Synedrella

synedrella
Habit Annuals, 10–80+ cm.
Stems

erect or ascending, branched from bases or ± throughout.
Leaves

cauline; opposite;

petiolate;

blades (usually 3-nerved) ovate to elliptic, bases cuneate to rounded, margins toothed, faces ± scabrous.
Involucres

cylindric to campanulate, 3–6 mm diam.
Receptacles

convex, paleate (paleae lance-linear, scarious, flat or weakly cupped at bases).
Ray florets

2–9+ (in 1–2 series), pistillate, fertile;

corollas yellowish.
Disc florets

4–12+, bisexual, fertile;

corollas yellowish, tubes about equaling slightly ampliate, cylindric throats, lobes 4, rounded-deltate.
Phyllaries

persistent, 2–5+ in 1(–2) series (lanceolate, herbaceous to chartaceous).
Heads

radiate, (sessile or subsessile) in axillary glomerules or borne singly.
Cypselae

dimorphic, strongly obcompressed or flattened, narrowly oval and winged (ray, wings laciniate) or linear-cuneate and not winged (disc);

pappi persistent, of 2 triangular scales (ray) or 2–3 subulate scales or awns (disc).
x

= 20?

Synedrella
Distribution
from USDA
Mexico; Central America; South America; West Indies [Introduced in North America; also introduced in Asia, Africa, Pacific Islands, Australia]
[BONAP county map]
Discussion

Species 1.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 127. Author: John L. Strother.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ecliptinae
Subordinate taxa
S. nodiflora
Name authority Gaertner: Fruct. Sem. Pl. 2: 456, plate 171, fig. 7. (1791)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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