Impatiens pallida is an annual herb to 1.5 m, much like I. capensis but mostly larger and much less common, stem branched, nodes swollen, juicy, rather translucent, waxy-pale green, internodes hollow.
Leaves alternate, to 10 cm long, soft, toothed, waxy-pale below.
Flowers pale yellow, sparsely dotted with reddish brown, conical, bilaterally symmetrical (as in I. capenisis), to 4 cm long, sepal spur 0.4-0.6 cm long; blooms June-Sept.
Fruit a capsule, twisting open explosively when touched, dispersing seeds locally; seeds also dispersed to distant sites by water.
Wetland status: FACW.
Frequency in NYC: Very infrequent.
Habitat: Open or part shade in wet soil, swamp forests, edges; soil pH 6.8-7.4 (USDA, NRCS 2006).