Orchis signifera subsp. mascula, (Vest) Soo, (Vest) Soo, 1927

D. M. Moore (ed.), 1980, CCIII Orchidaceae, Flora Europaea, Vol 5: Alismataceae to Orchidaceae, Camebridge: Cambridge University Press, pp. 325-350 : 341

(c) Subsp. signifera (Vest) Soö ,

Feddes Repert. 24: 28 (1927):

Spike dense, many-flowered. Perianth-segments purple, aristate- acuminate, the outer often deflexed at apex. Lateral lobes of labellum not deflexed; middle lobe up to twice as long as the lateral. Spur as long as ovary. 2n —42.

C., S. & E. Europe.