Dactylorhiza romana subsp. guimaraesii (E.G.Camus) H.A.Pedersen, Bot. J. Linn. Soc. 152: 426 (2006).
Homotypic Synonyms:
Orchis romana var. guimaraesii E.G.Camus, Iconogr. Orchid. Europe 1: 216 (1928).
Orchis guimaraesii (E.G.Camus) Rivas Goday, Farmacognosia 4(6): 193 (1945).
Heterotypic Synonyms:
Orchis sulphurea Link, Neues J. Bot. 1(3): 132 (1806), nom. nud.
Orchis romana lusus sulphurea (Link) Soó, Bot. Arch. 23: 63 (1929).
Dactylorhiza sulphurea (Link) Franco, Bot. J. Linn. Soc. 76: 366 (1978), nom. inval.
Plant (13.6–)24.8–38.9 (−45.4) cm high. Stem (3.0–)3.6–5.6(−8.0) mm in diameter immediately below the inflorescence. Sheathing leaves (excluding cataphylls) (1–)2–4(−5); the longest one (6.2–)8.2–13.2(−17.8) times as long as wide, (0.2–)0.3–0.5(−0.8) times as long as the height of the plant, describing an adaxial angle of (30–)39–68(−85)° to the stem. Non-sheathing leaves below the inflorescence (3–)5–8(−11).Inflorescence (3.9–)5.4–9.8(−14.5) cm long, (0.1–)0.2–0.3(−0.4) times as long as the height of the plant, carrying (8–)12–23 (−37) yellow flowers. Lamina of labellum (5.2–) 6.5–7.7(−8.5) × (7.3–)8.5–10.2(−10.8) mm, with the sidelobes describing an abaxial angle of (10–)32–83(−130)° to each other. Spur (7.4–)9.3–11.1(−12.1) mm long, (1.1–)1.3–1.6(−1.8) times as long as the lamina of labellum, (2.2–)2.6–3.1(−3.5) mm in diameter at the entrance.
W. Medit.