1. N.nigra (L.) Reichenb. fil.,
Icon FI. Germ. 13-14: 102 (1851) (Gymnadenianigra (L.) Reichenb.).
Stems 5-30 cm, somewhat angled, rather slender. Leaves 3-20 cm, linear to linear-lanceolate, acute to subobtuse, canaliculate, with denticu late margins. Spike 10-25 cm, many-flowered. Flowers 5-10 mm. Perianth-segments lanceolate to sublinear, acute. Labellum subtriangular to lanceolate-ovate, acuminate, entire or some times crenulate. Spur saccate, obtuse, violet or whitish. 2n = 64.
Meadows; somewhat calcicole.
Norway and Sweden; mountains of Europe southwards to N. Spain, C. Appennini and S. Greece. Al Au Bu Ga Ge Gr He Hs It Ju No Rm Su.
1 Lateral inner perianth-segments c.1 /2as wide as the outer; flowers usually blackish-crimson (a) subsp.nigra
1 Lateral inner perianth-segments about as wide as the outer; flowers red to whitish
2 Spike ±cylindrical; basal leaves 7-12 (b) subsp.rubra
2 Spike conical; basal leaves 12-18 (c) subsp.comeliana