Leaves oblong-ovate or ovate-lanceolate, 1 to 2 inches long, one-third to one-fourth of an inch wide, bright green, abruptly narrowed into the petioles which sheathe the base of the stem, more or less marked on the upper surface with white; stem 6 to 14 inches high, glandular-pubescent and scaly, bearing at the summit a loosely spiral spike of flowers 1 to 5 inches long; flowers whitish, lateral sepals free, the upper ones united with the petals to form a hood (galea), 2 to 3 lines long, broad and recurved at the tip; lip roundish-ovate, slightly saccate at the base, the long tip somewhat recurved.
In coniferous woods, more rarely in open places, Newfoundland to Ontario, Pennsylvania and Michigan. Flowering from July to September.
Memoir 15 N. Y. State Museum
B. Loddiges' S Rattlesnake Plantain - Peramium tesselatum