Hypericum mutilum is a perennial (sometimes an annual) herb, 10-80 cm tall, much branched above.
Leaves opposite, egg- to lance shaped, 1-4 cm long, tip blunt, base broad, rounded, partially clasping stem, surface speckled with minute, translucent glands (hold up to light), veins 3-5.
Flowers yellow, petals 0.2 cm long cm, sepals persistent about as long as fruit, stamens 5-16, styles 3, minute; inflorescence widely much-branched, with small bract-like linear leaves 0.1-0.4 cm long; blooms and fruits July-Sept.
Fruit capsule green becoming dry, elliptic, 0.2-0.3 cm long.
Wetland status: FACW.
Frequency in NYC Infrequent.
Habitat: Wet, open soil, pond edges.