Eugenia harkerae (Myrtaceae), a new species from Jalisco, Mexico ERANDI SÁNCHEZ-CHÁVEZ 1 AND SERGIO ZAMUDIO 2 1 Instituto de Ecología A.C, Carretera antigua a Coatepec 351, El Haya, 91073, Xalapa, Veracruz, Mexico; e- mail: erandi.sanchez4@gmail.com 2 Pátzcuaro, Mexico Abstract. Eugenia harkerae is here described as new from Jalisco, Mexico. It is morpho- logically similar to E. oerstediana and E. turneri; however, it differs by its pubescent branchlets with brownish hairs, uniflorous pendant inflorescences, peduncles of 1.5–3 cm long, and glabrous hypanthia. Keywords: Cloud forests, Endemic, San Sebastián del Oeste, Taxonomy, Western Mexico. Resumen. Eugenia harkerae se describe e ilustra como una nueva especie de Jalisco, México. Es morfológicamente similar a E. oerstediana y E. turneri; sin embargo, E. harkerae es reconocida por sus ramillas con tricomas marrones, inflorescencia uniflora y péndula sobre pedúnculos de 1.5–3 cm de largo y los hipantios glabros. According to Vasconcelos et al. (2017), Wilson et al. ( 2005), and Biffin et al. ( 2010), the Myrtaceae comprise 17 tribes, 140–144 genera, and about 5500 species. Although it is a cosmo- politan family, the greatest diversity is in the New World where it is represented by a single clade, the tribe Myrteae (Vasconcelos et al., 2015). A recent herbarium review found 10 genera of this tribe in México (Sánchez-Chávez & Zamudio, 2016). Eugenia L. is one of the richest genera within Myrteae. It has over 1100 species that occur in tropical and subtropical regions from southern Mexico, Cuba, and the Antilles to Uruguay and Argentina, with a small number of species in Africa, Southeast Asia, and the Pacific (Mazine et al., 2018). Eugenia species are remarkable in their number and in their morphological homoge- neity, factors that have resulted in taxonomic ne- glect and a reputation as a taxonomically complex group (Mazine et al., 2014). In Mexico, Eugenia has about 80 species (Villaseñor, 2004). During recent explorations in the municipality of San Sebastián del Oeste, several specimens of a Eugenia were collected whose characters did not match any of the known species. These specimens represent a new species, for which a description is provided here. Taxonomy Eugenia harkerae E. Sánchez-Chávez & Zamudio sp. nov. Type: Mexico. Jalisco: Municipio de San Sebastián del Oeste, 1450 m, 29 May 2017 [fl], E. Sánchez-Chávez, S. Zamudio Ruiz, R. Murillo & J. Ornelas- Álvarez 20 (holotype: IBUG; isotypes: CIIDIR, ENCB, MEXU, XAL). (Fig. 1.) Similar to Eugenia oerstediana and E. turneri, but it differs by the hirtellous branchlets with simple brownish trichomes, the uniflorous pen- dant inflorescence arising at the nodes of youn- gest branchlets with peduncles 1.5–3 cm long, petals retrorse and the glabrous hypanthium. Shrub 1–5 m tall; bark brown-reddish, slightly fissured and exfoliating in small thick irregular plates; branchlets compressed, fissured, hirtellous, with simple brownish trichomes up to 0.4 mm long, especially in the young parts, whit- ish and glabrescent with age. Leaves discolorous, opaque, upper surface dark green, under surface light green, petiole terete, canaliculate, 1.5–2.8 × 0.5–0.7 mm, hirtellous; blade elliptic to ovate- elliptic, 2.5–3.8(-4.5) × (0.8–)1–2.5 cm, about 1.8–2.5 times as long as wide, apex obtuse, acu- minate, base cuneate, rarely obtuse, margins Brittonia, DOI 10.1007/s12228-019-09595-8 ISSN: 0007-196X (print) ISSN: 1938-436X (electronic) © 2019, by The New York Botanical Garden Press, Bronx, NY 10458-5126 U.S.A.