Latin name: Haenianthus salicifolius
Common name: willow-leaved sunflower
Abbr: Hsa
Taxonomy: Oleaceae/Oleeae/Haenianthus
References : NCBI:txid126426
Introduction: Helianthus salicifolius , commonly called willow-leaved sunflower, is a Missouri native plant that occurs in unglaciated western Missouri prairie areas south of the Missouri River. Features clusters (branched panicles) of 2-2.5" wide sunflowers with bright yellow rays and dark brown center disks atop rigid, whitish-green stems typically growing 5-6' (less frequently to 8') tall. Narrow, drooping, willow-like, pale green leaves (5-7"). Attractive to butterflies and other insect pollinators. Blooms from late summer to fall. Good fresh cut flower.
Distribution: Native to South-central United States.
Information sources: Missouri Botanical Garde