New and noteworthy species of the genus Epidendrum (Orchidaceae, Laeliinae) from the Area de Conservacion Privada La Pampa del Burro, Amazonas, Peru Arista, Jessy Patricia Hagsater, Eric Santiago, Elizabeth Edquen, Jose D. Pariente, Eli Oliva, Manuel Salazar, Gerardo A. PhytoKeys 2023 2023-06-01 227 43 87 6G2LD 6CC1E448-BB5E-53B5-9235-73F3DCA98130 Hagsater & Dodson, Icon. Orchid. 4: t. 402. 2001. Hágsater & Dodson, Icon. Orchid. 4: t. 402. 2001. Liliopsida Orchidaceae Epidendrum CoL Plantae Epidendrum acrobatesii Asparagales 0 43 Tracheophyta species acrobatesii   Fig. 3  Type material.  Ecuador. Loja: N slope of Nudo de Sabanilla S of Yangana on road to Valladolid, 4°28'S, 79°10'W, 2500 m, 24 Feb. 1988, U. Molau & B. Eriksen 3191(holotype: GB!; isotypes: AAU! QCA!).  Description. Epiphytic or terrestrial, monopodial, branching, erect herb, 31-34 cm tall including inflorescence. Roots1-3 mm in diameter, emerging only from base of primary stem, fleshy, thick. Stemscane-like, erect, somewhat sinuous, branching from sub-apical internodes; primary stem 16 x0.5 cm; secondary stems 1.5-14.6 x0.3-0.4 cm. Leavesca. 19 on primary stem, 5-14 on secondary stems, distributed throughout stems, usually only apical 3-5 leaves remaining at flowering, alternate, articulate; sheath 0.7-1.4 x0.3-0.5 cm, tubular, rugose, striated; blade 2.2-3.8 x0.7-1.4 cm, length:width 3:1, apical leaf usually reduced, elliptic, mucronate, light green on both sides, apical margin minutely erose-dentate, spreading. Spathelacking. Inflorescenceup to 7.6 cm long including flowers, apical, flowering only once, racemose (sometimes with a short branch near base), erect in early stages, becoming arching-nutant as it develops; peduncle 5-7 mm long, terete, rachis 15-33 mm long, developing as new flowers are formed, flexuous, compact, ornamented with a short keel at base of each floral bract. Floral bracts1-3 mm long, much shorter than ovary, ovate, conduplicate, acute to obtuse. Flowers6-12, successive, 1-2 open at a time in different stages, with smaller buds present, erect, facing upwards, yellow to green; apparently not fragrant. Sepals10-12 x3.5-4.2 mm, free, spreading, narrowly elliptic to oblanceolate, acute, slightly aristate, especially the lateral sepals, 5-veined, margins entire, revolute. Petals12 x0.6-1.8 mm, free, spreading, linear or linear-obcuneate, obtuse to rounded, 1-veined, margins entire, spreading. Lip5.0-7.7 x7.0-9.0 mm, cordiform in general outline, deeply 3-lobed, somewhat concave basally in natural position with lateral margins and apex more or less revolute; bicallose, calli 3.7 x0.6 mm, elongate, parallel, with a mid-rib running to apical sinus, disc with multiple thickened veins, converging basally and radiating apically; lateral lobes 3.2 x7.0 mm, semi-sagittate, apex acute, margins progressively short-laciniate; mid-lobe 3.1 x3.2 mm, quadrate to obcuneate, apex truncate to emarginate, with a wide sinus, margins entire to erose. Column7-8 mm long, thin, straight. Clinandrium hoodtruncate, margin entire. Antherreniform. 4-celled. Pollinia4, obovate, laterally compressed, inner face of each pair flat; caudicles short. Rostellumapical, slit; viscarium semi-liquid, transparent. Cuniculuspenetrating half of pedicellate ovary and widened toward the middle of the ovary, forming a narrowly ellipsoid vesicle. Ovary17-24 x1.6-3.2 mm, slightly inflated ventrally beyond middle forming an elongate vesicle, but narrow near apex, furrowed. Capsulenot seen.   Figure 3.  Epidendrum acrobatesiifrom Arista et al. 21 Ahabit Bflower Cdissected perianth Dinflorescence at apex of stem Elongitudinal section of flower Fcolumn and ovary-pedicel from below (left) and side (right) Ganther from above (left) and below (right), and pollinarium (Photographs by J. D. Edquen; plate prepared by A. Cisneros).  Additional specimens examined.    Peru. Amazonas: La Pampa del Burro, 22 Aug. 2021, Arista et al. 21(KUELAP!);   Pasco: Oxapampa, Parque Nacional Yanachaga-Chemillen, parte alta de la trocha Tunqui-Cajonpata, sector Tunqui,  1950 m, 31 Oct. 2007, Monteagudo 15793(HOXA!).  Other records.  Peru. Amazonas: Chachapoyas: Distr. Longuita, Fortaleza Kuelap, 14 Nov. 2019, Harding s.n., digital images (AMO!); Bongara: Yambrasbamba; Progreso, 30 Dec. 2019,  Velasquezs.n., digital images (AMO!); San Martin: Prov. Rioja, Distr. Pardo Miguel Naranjos, 1962 m, 6 Nov. 2015,  Edquen2042, digital images (AMO!); Ibid. loc., 1691 m, 22 Feb. 2017,  Edquen2043, digital images (AMO!); Ibid. loc., 1790 m, 20 Feb. 2017,  Edquen2044, digital images (AMO!); hort. Moyobamba, 9 Jan. 2017, Goicochea s.n., digital images (AMO!).  Distribution. Widespread from Ecuador (Napo and Zamora-Chinchipe) south to Oxapampa, Pasco, in central Peru. The range of the species along the upper eastern slope of the Andes in Ecuador and central Peru spans some 1150 km, with at least 7 known localities. Growing at 1691-2500 m.  Habitat and ecology. Epiphytic, found on very wet fallen logs with abundant moss, in primary montane humid forest or elfin forest, often with afternoon fog. Sometimes at the base of  ChusqueaKunth. Also terrestrial on edge of roadside banks of white sand with abundant organic material in elfin forest.  Phenology. Flowering throughout the year.  Taxonomic notes.   Epidendrum acrobatesiihas leaves with a length:width proportion about 3:1, elliptic, with the margin minutely erose-dentate, the inflorescence 5 cm long, with 6-12 greenish yellow flowers, sepals 10-12 mm long, petals linear to linear-obcuneate, and the lateral lobes of the lip nearly as long as the mid-lobe, which is apically truncate to emarginate.  Epidendrum batesiiDodson has proportionately narrower leaves, 2.5-3.4 x0.6-0.8 cm, length:width 4:1, the mid-lobe of the lip shorter and entire, 2.3-2.5 mm long.  Epidendrum oxybatesii Hagsater& Dodson from northern Ecuador is distinguished by the long, acicular mid-lobe of the lip. This is an addition to the flora of Peru. The Batesii Group has a peculiar architecture in that the new stems produced from the apical half of the basal stem can be as long as the primary stem, and those closest to the apex are produced first, with shorter stems being later produced further down the primary stem. 2021-08-22 Peru La Pampa del Burro 1 Amazonas 2007-10-31 Peru Oxapampa 1950 Tunqui-Cajonpata Parque Nacional Yanachaga-Chemillen 1 Pasco