Iva angustifolia is a species of flowering plant in the family Asteraceae known by the common name narrowleaf marsh elder.United States Department of Agriculture Plants Profile It grows in the south-central and southeastern United States (Kansas, Oklahoma, Arkansas, Texas, Louisiana, Florida).
Iva angustifolia is a wind-pollinated annual herb sometimes as much as 100 cm (40 inches) tall. It has long, narrow leaves up to 45 mm (1.8 inches) tall. It produces numerous small flower heads in elongated arrays at the tips of branches, each head with 2-7 flowers.Flora of North America, Iva angustifolia Nuttall ex de Candolle 1836
References
External links photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1917 Lady Bird Johnson Wildflower Center, University of Texas Dave's Garden University of Texas photos