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Epidendrum imazaense Hágsater, E.Santiago, J.P.Arista & Edquén, E. echinatiantherum Hágsater, E.Santiago, J.P.Arista & Edquén, E. parvireflexilobum Hágsater, J.P.Arista & Edquén, E. rosulatum Hágsater, E.Santiago, J.P.Arista & Edquén, E. ochrostachyum Hágsater, E.Santiago, J.P.Arista & Edquén, in Arista, Hágsater, Santiago, Edquén, Pariente, Oliva et Salazar. 2023. |
Abstract
Fourteen species of the genus Epidendrum, recently collected in the Área de Conservación Privada La Pampa del Burro (ACPPB), five of them new to science (Epidendrum echinatiantherum sp. nov., E. imazaense sp. nov., E. parvireflexilobum sp. nov., E. rosulatum sp. nov., and E. ochrostachyum sp. nov.), are described and illustrated. The other species include a new record for Peru (E. acrobatesii) and four for the department of Amazonas (E. brachyblastum, E. forcipatum, E. mavrodactylon, and E. tridens). Epidendrum enantilobum is here considered a synonym of Epidendrum brachyblastum. The type locality of Epidendrum cryptorhachis, originally stated as Ecuador, Guayabamba, is corrected to indicate that it refers to the valley of Guayabamba, Rodríguez de Mendoza, Amazonas, Peru. Our results show the need to continue conducting botanical exploration in the ACPPB as a baseline for subsequent studies, including a full inventory of the orchid diversity.
Key words: Dwarf forest on white sand, eastern Andean ridge, Lankester Composite Dissection Plates, moist or wet montane forest, range extension
Epidendrum echinatiantherum Hágsater, E.Santiago, J.P.Arista & Edquén, sp. nov.
Diagnosis: Similar to Epidendrum madsenii Hágsater & Dodson, both vegetatively and florally, but the main distinguishing feature is the dark vinaceous anther with the central green vertical rib with a heavily echinate apical, elongate, pyramidal, truncate process, covered by numerous disorganized white bristles (vs. dark brown-black anther without a green vertical rib, and an unornamented apical process, which is laminar, forming an erect, semi-tubular laminar flap, the margins dentate).
Etymology: From Latin echinatus, bristly, furnished with numerous rigid hairs, or straight prickles, and anthera, the cover of the pollinarium at the apex of the column, which has an appendage heavily covered with white bristles, a rare and prominent feature of this species.
Epidendrum imazaense Hágsater, E.Santiago, J.P.Arista & Edquén, sp. nov.
Diagnosis: Similar to Epidendrum freireanum Hágsater & E.Santiago, but the plants are smaller, 3.6–10 cm tall (vs. plants 10–40 cm tall), the leaves 1.1–3.6 cm long (vs. leaves 3.7–7.0 cm long), the ovary 10 mm long, sigmoid, with a prominent ventral vesicle, inflated in the middle (vs. ovary 6 mm, straight, not inflated), the sepals 5.5 mm long (vs. sepals 10 mm long), and the flowers pale green with a red-brown tinge on the tepals (vs. flowers purple brown with lip and apex of column ivory white).
Etymology: In reference to the Imaza river, whose basin includes the Pampa del Burro. This river is a tributary of the Chiriacu river, an affluent of the Marañón river.
Epidendrum ochrostachyum Hágsater, E.Santiago, J.P.Arista & Edquén, sp. nov.
Diagnosis: Similar to Epidendrum bangii Rolfe but differs by the shorter lateral sepals, 13 mm long, spreading, ovate-elliptic, the apex obtuse (vs. lateral sepals 16–18 mm long, slightly reflexed, obliquely ovate, with the apex acuminate), the shorter petals, 10 mm long, oblanceolate, apex obtuse (vs. petals 13–15 mm long, linear, apex acuminate), the floral bracts 8–13 mm long, nearly as long as the ovary (vs. floral bracts 11–22 mm long, longer than the ovary), and the column with a pair of truncate wings (vs. column with a pair of rounded wings).
Etymology: From the ochre color of the flowers, from the Greek ὠχρός, and σταχυς, from the Greek spike, in reference to the Macrostachyum Group to which the species belongs.
Epidendrum parvireflexilobum Hágsater, J.P.Arista & Edquén, sp. nov.
Diagnosis: Similar to Epidendrum reflexilobum C.Schweinf., but overall smaller, with plants 22–46 cm tall including the inflorescence (vs. 40–120 cm tall), sepals 9.5–10.8 mm long, elliptic (vs. sepals 12.5–13.5 mm long, obovate-elliptic), the lateral lobes of the lip semi-ovate, erect (vs. lateral lobes spreading, twisted 90° in natural position, narrowly obovate), the callus 3-ribbed, forming a cuneate platform only reaching middle of mid-lobe (vs. callus 3-ribbed, ribs not forming a platform, with the mid-rib longer and reaching apical sinus).
Etymology: From the Latin parvi-, small, and reflexilobum, reflexed lobes, in reference to the smaller flowers and lobes of the lip relative to those of closely allied E. reflexilobum.
Epidendrum rosulatum Hágsater, E.Santiago, J.P.Arista & Edquén, sp. nov.
Diagnosis: Similar to Epidendrum croceoserpens Hágsater & Salas-Guerr. but the plants much smaller, up to 2.5 cm tall (vs. plants 9 cm tall), the leaves 0.8–1.2 cm long, orbicular, 4–7 forming a rosette (vs. leaves 3.5–5.6 cm long, 1–3, lanceolate), the flowers 7, ochre–yellow, with sparse red dots (vs. flowers 3–6, orange, turning pink with age), and the lip ovate-triangular, acute (vs. lip widely cordiform, base sub-cordate, apex short apiculate, margin erose-crenulate).
Etymology: From the Botanical Latin rosulatus, rosette (a circular cluster of leaves) shaped, in reference to the distinctive rosette formed by the leaves, which is a rare trait in the genus.
Jessy Patricia Arista, Eric Hágsater, Elizabeth Santiago, José D. Edquén, Elí Pariente, Manuel Oliva and Gerardo A. Salazar. 2023. New and Noteworthy Species of the Genus Epidendrum (Orchidaceae, Laeliinae) from the Área de Conservación Privada La Pampa del Burro, Amazonas, Peru. PhytoKeys. 227: 43-87. DOI: 10.3897/phytokeys.227.101907
