Aganisia cyanea (Lindl.) Rchb., 1869

Thiago E. C. Meneguzzo, José F. A. Baumgratz & Cássio Van Den Berg, 2015, Taxonomic studies in the Aganisia complex (Orchidaceae, Zygopetalinae), Phytotaxa 238 (1), pp. 1-39 : 5

1.1. Aganisia cyanea (Lindl.) Rchb. f.

Epiphytic herbs. Pseudobulbs 6.0–7.5 × 0.8–1.8 cm, fusiform. Leaf with petiole 3.0–4.5 cm long; blade 21.0–41.0 × 5.5–10.0 cm, elliptic to narrow-elliptic, base attenuate, apex obtuse. Inflorescence 22–38 cm long, 3–11-flowered; peduncle 17–24 cm long; rachis 3–17 cm long. Flowers with pedicellate ovary 1.5–2.0 cm long; sepals, petals, lip and column lilac, rarely yellowish midlobe or sepals, petals and lip white, rarely yellow lip. Sepals 2.7–3.8 × 2.0– 2.4 cm ovate, base cuneate, apex obtuse, the laterals oblique. Petals 2.5–3.4 × 1.6–2.7 cm, elliptic to orbiculate, base attenuate, apex obtuse. Lip lateral lobes 0.6–0.8 × 0.2–0.3 cm, semi-trullate, distal face strongly constricted, distal portion with hippocrepiform, retrorse callus, the external pair of lamellae with erose margins, distally fimbriate between the lamellae; midlobe 1.5–2 × 2.7–3.5 cm, flabellate, slightly concave, base obtuse, apex rounded, margin undulate and inconspicuously crenate. Column 1.4–1.8 × 0.5–0.6 cm, semi-terete; anther cap apex obtuse-denticulate; rostellum remnant trilobed with midlobe acute and unequal to lateral ones, laterals truncate. Capsule 4.3–5 × 0.8–1.3 cm, fusiform.

Diagnostic characters:— Distinguished by flowers with sepals and petals lilac or white, rarely lip yellowish or with a yellow midlobe, lip with lateral lobes strongly constricted, callus hippocrepiform, retrorse, the external pair of lamellae with erose margins and distally fimbriate between the lamellae, midlobe flabellate, slightly concave, margin undulate and inconspicuously crenate. Hoehne (1951) found specimens with rhizomes up to 5 m long.