Koellensteinia eburnea (Barb.Rodr.) Schlechter (1918b: 28)

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 : 18

3.3. Koellensteinia eburnea (Barb.Rodr.) Schlechter (1918b: 28) .

Cyrtopodium eburneum Barbosa Rodrigues (1881: 74) . Type: — BRAZIL. Minas Gerais: S"o Jo"o del Rei, s.d., Barbosa Rodrigues s.n. (type J. Barbosa Rodrigues’s herbarium†; the lectotype, here designated, is the original illustration! of the same specimen that was to be published in Iconographie des Orchidées du Brésil t. 708, deposited at the library of Jardim Botânico do Rio de Janeiro, bound volume 5 of the book with same title published by Sprunger et al. (1996: 333, t. 208)). Fig. 6 F,G

Cyrtopodium lineatum Barbosa Rodrigues (1901: 52) . Koellensteinia lineata (Barb.Rodr.) Garay (1973: 52) . Type:—BRAZIL. Mato Grosso: Chapada dos Guimar"es [“Chapada de Matto Grosso”], Cap"o Seco, June 1897, Barbosa Rodrigues s.n. (type J. Barbosa Rodrigues’s herbarium†; the lectotype, designated here, is the illustration of the same specimen published in the protologue: Barbosa Rodrigues 1901: t. 6, fig. B!), syn. nov.

Aganisia boliviensis Rolfe ex Rusby in Rusby (1907: 448). Koellensteinia boliviensis (Rolfe ex Rusby) Schlechter (1918b: 32) . Type: — BOLIVIA. S loc., s.d., Bang 2909 (lectotype, designated here, K 588990!, isolectotypes GH 5997!, MO 1183144!, NY 5860!, NY 5861!, US 93932!, US 93933!), syn. nov.

Etymology:— From Latin, eburneus, ivory, due to flower colour.

Selected material examined:— BRAZIL. Distrito Federal: Brasília, 17 January 1995, Batista, 481 (CEN). Goiás: Corumbá de Goiás, 17 January 1972, Irwin et al. 34388 (AAU, HB, UB, UEC); Formosa, 4 January 2015, Meneguzzo & Meneguzzo 973 (RB). Mato Grosso do Sul: Rio Verde de Mato Grosso, 8 February 1975, Hatschbach et al. 35979 (MBM). Minas Gerais: Belo Horizonte, 16 January 1933, Barreto 4891 (BHCB, SP); Serra do Itabirito, 9 February 1968, Irwin et al. 19694 (HB, UB).

Distribution: —Bolivia and west-central and southeastern Brazil: Distrito Federal, Goiás, Mato Grosso, Mato Grosso do Sul, Minas Gerais. TDWG code: 83 BOL-OO 84 BZC-DF BZC-GO BZC-MT BZC-MS BZL-MG.

Diagnostic characters:— Koellensteinia eburnea differs from K. kellneriana and K. tricolor in its broader leaves (up to 7 cm vs. up to 3 cm), and lip midlobe narrower than length between lateral lobes vs. lip midlobe width equal or subequal to length between lateral lobes. Koellensteinia eburnea is similar to K. ionoptera and different from K. kellneriana and K. tricolor in the petals overlapping with the dorsal sepal.

Nomenclatural note:— The selected lectotype for Cyrtopodium lineatum is the illustration in the protologue because the original one was not found among the Barbosa Rodrigues manuscripts.

Taxonomic note:— Apparently Reichenbach (1881b) was the first to identify the central Brazilian specimens this species as Koellensteinia tricolor , as have all subsequent botanists, e.g. Cogniaux (1898a), Hoehne (1953), and Pabst & Dungs (1977). After a critical study of types and collections, it is easy to separate K. eburnea in the Brazilian and Bolivian savannahs from K. tricolor in the Guyana Shield. Foldats (1970) misapplied the name K. eburnea to Venezuelan specimens of K. tricolor .

Figures

FIGURE 6. A. Koellensteinia carraoënsis. B. Koellensteinia graminea. C. Koellensteinia hyacinthoides. D. Koellensteinia florida, plant in situ. E. Manually opened flower of K. eburnea. F. Flower. G. Plant in situ. H. Koellensteinia tricolor. A – C. By K. Senghas, available through Swiss Orchid Foundation at Herbarium Jeny Renz. D – E. Meneguzzo 861 (RB). F – G. Meneguzzo 973 (RB). D – G. By Thiago E. C. Meneguzzo. H. Pessoa 1152 (RB), by Edlley M. Pessoa.