Euphorbia dentata is an annual C4 herb (Ludwig et al. 2010), 20-60 cm tall, often branched, sap milky, toxic.
Leaves opposite, linear to egg-shaped, hairy, margin toothed to almost smooth.
Flowers small, inconspicuous, 0.3 cm, lobes of flower cup fringed; inflorescence dense.
Fruit dry, 0.5 cm; blooms July-Sept.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Origin: Midwestern and western USA.
Habitat: Dry, sandy soil, roadside weed.