Taxonomic studies in the Aganisia complex (Orchidaceae, Zygopetalinae) Thiago E. C. Meneguzzo José F. A. Baumgratz Cássio Van Den Berg Phytotaxa 2015 2015-12-09 238 1 1 39 3RBSX Schlechter (1925: 126) Schlechter 126 1925 [187,796,268,295] Liliopsida Orchidaceae Koellensteinia Plantae Asparagales 19 20 Tracheophyta species hyacinthoides   Etymology:—From Greek, uάκινθος, and the suffix -οειδης, similar to, in reference light yellow flowers like some cultivars of  Hyacinthus.   Selected material examined:—BRAZIL.Amazonas: S"o Gabriel da Cachoeira, 16 March 1975, Pires& Marinho 15874(IAN). COLOMBIA. Guainía: Maimachi, 2 April 1993, Madriñán & Barbosa 847(GH). GUYANA. Upper Takutu-Upper Essequibo: Komo Creek, December 1948, Forest Department WB 639(K). SURINAME. Nassau: 11 March 1949, Lanjouw & Lindman 2620(U). VENEZUELA. Amazonas: Cerro Yapacana, 7 May 1979, Steyermark & Bunting 103203(AMES).   Distribution:—French Guyana, Guyana, Suriname, Venezuela, Colombia and northern Brazil:Amazonas.TDWG code: 82 GUY-OO SUR-OO VEN-OO 83 CLM-OO 84 BZN-AM.   Diagnostic characters:—  Koellensteinia hyacinthoidesis characterized by its medium-sized plants (40–60 cm tall), and differs of  K. carraoënsisby an inflorescence shorter than half the length of the leaf blade and arched vs. subequal in size of leaf blade and erect, flowers yellow vs. whitish to yellow, petals with distal margin slightly entire vs. erose, lip lateral lobes with margin erose vs. entire, lip midlobe longer than lateral lobes vs. shorter, and lateral lobes of clinandrium not extending beyond midlobe vs. extending.   Nomenclatural notes:—A neotype was chosen for  Koellensteinia hyacinthoidesbecause the type specimen was destroyed.