Fruct. Sem. Pl. 2: 456, plate 171, fig. 7. 1791.

Etymology: Etymology not clear perhaps alluding to clustering of heads
Treatment appears in FNA Volume 21. Treatment on page 127. Mentioned on page 65, 67.
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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. Heads radiate, (sessile or subsessile) in axillary glomerules or borne singly. Involucres cylindric to campanulate, 3–6 mm diam. Phyllaries persistent, 2–5+ in 1(–2) series (lanceolate, herbaceous to chartaceous). 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. 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?


Introduced; Mexico, West Indies, Central America, South America, also introduced in Asia, Africa, Pacific Islands, Australia.


Species 1.

Selected References


... more about "Synedrella"
John L. Strother +
Gaertner +
Mexico +, West Indies +, Central America +, South America +, also introduced in Asia +, Africa +, Pacific Islands +  and Australia. +
Etymology not clear +  and perhaps alluding to clustering of heads +
Fruct. Sem. Pl. +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Synedrella +
Asteraceae (tribe Heliantheae) subtribe Ecliptinae +