Locality:
United States, Wisconsin, Iowa, 7 km ENE of center of Muscoda, vic. western parking area for Avoca Prairie and Savanna State Natural Area, at confluence of Marsh Creek with Wisconsin River
Habitat:
Floodplain forest of Quercus bicolor, Fraxinus pennsylvanica (both var. pennsylvanica and var. subintegerrima) Zanthoxylym americanum.
Occurrence Remarks:
Single-stemmed shrub 3.5 m. tall, 7 cm. in diameter; cut wood with unpleasant odor of Valeriana and some other Caprifoliaceae. Voucher for wood specimen, Kw, Lw, MADw, MEXUw, RSAw. Nearing end of flowering period; corolla white.