Satyrium princeae Kraenzl., Bot. Jahrb. Syst. 33: 56 (1902).
Satyrium unifolium Schltr., Bot. Jahrb. Syst. 53: 525 (1915).
Slender terrestrial herb 20–40 cm high. Basal leaf 1, appressed to the ground, 3.5–5 × 4.5 cm, heart-shaped; stem with 3–6 sheathing leaves up to 3 cm long. Inflorescence c. 6 × 2 cm, fairly densely up to 20-flowered.Flowers bright rose-pink, bracts purplish. Pedicel and ovary 7–8 mm long; bracts reflexed, up to 15 × 5 mm, lanceolate, acute. Sepals and petals projecting forwards, joined to each other and lip for 2–3 mm. Median sepal 7–9 × 1–1.3 mm, ligulate to oblanceolate, rounded at apex; lateral sepals oblique, of similar length and slightly wider. Petals similar to median sepal but slightly shorter. Lip 6–7 mm long, 6–7 mm wide when spread out, very convex, the apex reflexed. Spurs 11–18 mm long, slender, tapering, parallel to ovary. Column slender, erect, 4.5–6.5 mm high; stigma 1–1.5 × 2 mm; rostellum shortly and almost equally 3-toothed, the middle tooth bifid.
Tanzanian plants are much larger, with basal leaf up to 11 × 9 cm, and inflorescence to 18 cm long.
Montane grassland, usually in wetter areas 1900–2400 m.
Tanzania to Zambia