Panicum philadelphicum is an annual C4 grass (Aliscioni et al.), 10-50 cm tall, slender, branched from base.
Leaves yellow-green, 0.3-0.8 cm wide. Sheaths and leaves often bristly-hairy.
Flower spikelets 1-flowered, about 0.2 cm long, egg-shaped, mostly paired at ends of very thin stalks.
Fruit becoming black; June-Oct.
Wetland status: FAC- (USDA, NRCS 2010).
Frequency in NYC: Very infrequent.
Habitat: Open, dry woods, fields, sandy or rocky soil.