Materials to the revision of the genus Cranichis (Orchidaceae) in Bolivia Author Kolanowska, Marta https://orcid.org/0000-0001-5347-5403 University of Lodz, Faculty of Biology and Environmental Protection, Department of Geobotany and Plant Ecology, Lodz, Poland & Department of Biodiversity Research, Global Change Research Institute AS CR, Brno, Czech Republic Author Baranow, Przemyslaw https://orcid.org/0000-0003-1907-7211 Department of Plant Taxonomy and Nature Conservation, University of Gdansk, Gdansk, Poland przemyslaw.baranow@ug.edu.pl Author Nowak, Slawomir Department of Plant Taxonomy and Nature Conservation, University of Gdansk, Gdansk, Poland Author Fuentes, Alfredo Herbario Nacional de Bolivia, Instituto de Ecologia, Universidad Mayor de San Andres, La Paz, Bolivia text PhytoKeys 2021 2021-11-29 186 11 41 http://dx.doi.org/10.3897/phytokeys.186.71499 journal article http://dx.doi.org/10.3897/phytokeys.186.71499 1314-2003-186-11 16777115B7FE521383BEF4C3A4479D66 1. Cranichis atrata Schltr., Repert. Spec. Nov. Regni Veg. Beih. 7: 58. 1920. Type . COLOMBIA . Madero 3 (B†; lectotype , designated by Garay (1978 : 191): AMES-drawing). Diagnosis. Plants 24 cm tall, erect. Leaf 1, basal, petiolate; petiole 12 cm long, narrow, canaliculate; blade 9 cm long, 7 cm wide, obliquely elliptical, acuminate, base cordate. Scape glabrous, enclosed in 4 non-foliaceous sheaths. Inflorescence 2.5 cm long, subdensely many-flowered . Flowers small, glabrous. Floral bracts 4.8 mm long, lanceolate, obtuse. Pedicellate ovary 5.0 mm long, glabrous. Dorsal sepal 3.7 mm long, 1.0 mm wide, oblong-elliptical, obtuse, 1-veined. Petals 3.1 mm long, 1.1 mm wide, obliquely ligulate-oblanceolate, obtuse, long cilia on both margins, 1-veined. Lateral sepals 3.1 mm long, 1.5 mm wide, obliquely elliptic-ovate, subacuminate, 1-veined. Lip 2.8 mm long, 2.1 mm wide, concave in the centre, subsessile, elliptic-obovate, minutely apiculate; disc with 3 thickened, dendritic branching veins. Gynostemium 1.3 mm long. Fig. 1 . Figure 1. Cranichis atrata Schltr. A Ovary and floral bract. B Floral bract. C Dorsal sepal. D Petal. E Lateral sepal. F Lip. Drawn by P. Baranow from R. Vasquez et al. 1429 (LPB). Habitat and ecology. Terrestrial plants growing in subhumid Tucumano-Boliviano forest at an altitude of 2200 m. Flowers in February. Representative specimen. BOLIVIA. Santa Cruz : Prov. Vallegrande. Rio San Lorenzo, entre Piraimiri y Masicuri , 2220 m. 23 February 1991, R. Vasquez et al. 1429 (LPB!). Fig. 2 . Figure 2. Distribution of Cranichis species in Bolivia. A C. atrata , C. badia , C. beckii , C. ciliata , C. cylindrostachys . B C. garayana , C. lehmannii , C. longipetiolata , C. maldonadoana . C C. mandonii , C. muscosa , C. pulvinifera , C. silvicola , C. stictopylla. Base map provided by Natural Earth (www.naturalearthdata.com). Notes. This species is usually considered to be a synonym of C. ciliata (e.g. Garay 1978 ; Hamer 1985 ; Christenson 1991 ; Bogarin et al. 2014 ), however, the venation of the lateral sepals is a constant character that can be used to distinguish these two taxa. Lateral sepals of C. atrata are always 1-veined (vs. 2- or 3-veined).