Comprehensive Description

provided by North American Flora
Flaveria oppositifolia (DC.) Rydberg
Gymnosperma oppositi folium DC. Prodr. 5: 312. 1836. Flaveria longi folia A. Gray, Mem. Am. Acad. II. 4: 88. 1849.
A rather stout annual herb; stem 3-10 dm. high, simple below; leaves glabrous, broadest at the sessile base, nearly linear, entire or rarely with spinulose denticulations; heads 10-15flowered, in ample, rather open, cymes; involucral bracts 5-7, oblong, 4 mm. long; rayflower wanting; disk-corollas 3 mm. long, glabrous; tube rather shorter than the throat; achenes 1.5 mm. long.
Type locality: Between San Ferrado and Santander [Tamaulipas]. Distribution: Coahuila to Tamaulipas and Aguas Calientes.
bibliographic citation
Per Axel Rydberg. 1915. (CARDUALES); CARDUACEAE; HELENIEAE, TAGETEAE. North American flora. vol 34(2). New York Botanical Garden, New York, NY
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