Stem 1, 2, or 3 feet tall, from a root of 2 or 3 fusiform, hairy tubers; leafy. Lowest leaves oblanceolate, obtuse, 2—5 inches long, upper ones lanceolate, acute, much longer. Spike of flowers 4—12 inches long, loosely flowered, the bracts linear-lanceolate, the lowest much longer than the flowers, 1—1½ inches long. Flowers about ½ an inch long; sepals yellowish-green and thin, the upper one ovate, erect, about ⅛ of an inch long, the lateral ones obtuse and spreading, ¼ of an inch long, petals lanceolate, acute, greenish-purple or green; lip purple or greenish, linear, obtuse, thick, over ¼ of an inch long; spur about ½ as long as the lip, sack-like. Frequent through the region in open swamps, wet meadows and sloughs, varying greatly in size; flowering during June and early July. [Illustration: _a_ Ophrys borealis (Morong). Northern Twayblade. _b_ Cœloglossum bracteatum (Willo) Parl. Long-Bracted Orchid. _c_ Limnorchis fragrans Rydb. Fragrant White Bog-Orchid. _d_ Lysiella obtusata (Pursh) Rydb. Small Northern Bog-Orchid. _e_ Ophrys nephrophylla Rydb. Heart-Shaped Twayblade. (⅔ Nat.)] [Sidenote: =Limnorchis viridiflora= (Cham.) Rydb. _Small Green Bog-orchid._] Stem 8—18 inches high, strict and leafy. Lower leaves oblanceolate, obtuse, 2—4 inches long, upper lanceolate and acute; spike of flowers short and dense, the bracts linear-lanceolate, the lower slightly exceeding the flowers. Flowers ½ an inch long or less, yellowish-green; upper sepals broadly ovate, erect; lateral ones ¼ of an inch long, acute, spreading; petals erect, lanceolate, acute; lip lanceolate, obtuse, less than ¼ of an inch long; spur club-shaped, curved, about as long as the lip. Differs from the last species in the bright green colour, slightly smaller flowers with broader based lip and the longer, club-shaped curved spur. In bogs throughout the region; flowering in June. [Sidenote: =Limnorchis borealis= (Cham.) Rydb. _Small White Bog-orchid._] Stem 18 inches to 2 feet high, slender and leafy. Leaves, the lower oblanceolate and obtuse, the upper lanceolate, acute. Spike of flowers often rather dense, 4—8 inches long; bracts lanceolate, the lower often much exceeding the flowers; flowers ½ an inch or more long, white or sometimes yellowish or greenish-white; upper sepals ovate, obtuse, ¼ of an inch long, lateral ones oblong-lanceolate, spreading; petals lanceolate, slightly shorter than the sepals; lip rhombic-lanceolate, obtuse, about ¼ of an inch long; spur club-shaped about the length of or shorter than the lip. Throughout the region in open boggy places and wet meadows; flowering in June. [Sidenote: =Limnorchis fragrans= Rydb. _Fragrant Orchid._]