Oligoneuron rigidum var. rigidum is a perennial herb 25-150 cm tall, usually hairy.
Leaves alternate, stalk (petiole) of basal leaves to over 25 cm long, blade 6-25 cm long, 2-10 cm wide, mostly basal, elliptic, tip rounded to basely pointed, middle and upper leaves stalkless, smaller.
Flowers yellow, of two types in small heads, rays 7-14, to 0.5 cm long; heads large, disk to 1 cm wide, bracteate base to 0.9 cm long; inflorescence 5-25 cm wide, dense.
Fruit dry achenes, plumed.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Dry, open soil. This population may have been planted. S. rigida is recommended for planting in restorations by various nurseries (Lamont and Young 2002).
Notes: “This genus was previously treated as a section in the genus Solidago or with the genus Aster. The genus Oligoneuron is considered phylogenetically a basal or near-basal member of the subtribe Astereae” (Wikipedia 2017). Flora of North America includes this in Solidago