Aruncus dioicus var. pubescens
Rhodora 41: 423. 1939.
Leaf surfaces densely hairy. Styles 0.3–0.8 mm. Follicles slender, 1.6–2.4 mm. Seeds 1.5–2 mm. 2n = 18.
Phenology: Flowering early summer.
Habitat: Rich woods, limestone bluffs
Elevation: 50–700 m
Ark., Ill., Ind., Iowa, Ky., Miss., Mo., Ohio, Okla., Tenn.
Variety dioicus gradually gives way to var. pubescens, which has more consistently thicker and hairier leaves and occurs west of the Appalachian Mountains; there is variation in indument throughout the eastern range of var. dioicus.
"thick" is not a number.