helianthus angustifolius helianthus • helianthus annuus · · · Info · Definitions · Synonyms · Characters · · helianthus angustifolius · · Text Common · · Latin · · Scripts 24 · · Length 10 · · Syllables Definitions · · · (noun) sunflower of eastern North America having narrow leaves and found in bogs. Synonyms: swamp sunflower, Helianthus angustifolius. · · Noun Definition 1 Synonyms · · · swamp sunflower · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075