A Noteworthy New Species of Peritassa (Celastraceae, Hippocrateoideae) from Amazonian Brazil Julio Antonio LombardiDIepartamento de Botanica, Instituto de Biociencias, Universidade Estadual Paulista 'Jflio deMesquita Filho', Av. 24-A 1515, 13506-900, Rio Claro, Sao Paulo, Brazil.
[email protected]\'r: t. The new species Peritassa manaoaraLomlbari differs from other species in Peritassa Miersby its unique 3-lobed stigma. The inclusion of thisnew taxon in Peritassa was based on the character-istics of non-confluent anther locules and the disc freefrom the ovary wall, which distinguishes this speciesfrom Tontelea Aublet, the only other genus ofNeotropical Hippocrateoideae species with a 3-lobedstigma and tubular nectariferous disc.RistiuMo. A nova especie Peritassa manaoara Lom-bardli e distinta de todas as outras especies dePeritassa Miers pelo seu estigma trilolado uinico. Ainclusao deste taxon novo em Peritassa foi baseada nacaracteristica das anteras comn l6culos nao confluentese disco neclarffero livre da parede do ovario, issocoloca essa especie aparte daquelas incluidas emTontelea Aublet, o finico outro genero Neotropical deHipp ocrateoideae com especies corn esligma trilobadoe disco tubular. Key words: Amazon basin, Brazil, Celastraceae,Hlippocrateoideae, IUCN Red List, Peritassa. The Hiippocrateaceae are now included in Celas-traceae as the subfamily Hippocrateoideae, a taxonincluding five tribes, 24 genera, and ca. 357described species (Halle, 1990; Mennega, 1997)distributed worldwide in tropical and subtropicalareas. The delimitations of Neotropical genera in theHIippocrateaceae are notoriously controversial andrange from two, Salacia 1.. and Hippocratea L.(Peyritsch, 1878), to 17, according to Miers (1872).In this work, I follow Smith (1940), who recognizesthree genera segregated from Sralacia, CheilocliniumMiers, Peritassa Miers. and Tontelea Aublet andincluded in the tribe Salacieae with the AfricanSalacighia Loesener and Thyrsosalacia Loesener(Mennega, 1997). The genus Peritassa, with 17 described species(Lombardi, 2004; Lombardi & Temponi, 1999;Mennega, 1997) is exclusively Neotropical. It wasdescribed by Miers (1872) and segregated fromSalacia because of the presence of anthers with a longitudinal dehiscence and a prominent connec-tive, and of a tubular nectariferous disc. Olher species with no prominent connective and different de-hiscence were added later (Lombardi, 2004; Lombardi & Temponi, 1999; Smith, 1940). These species have inconspicuous anther connec-tives and oblique dehiscence clefts, almost transverse, and are distinguished from other fleshy-fruited genera (tribe Salacieae, Mennega, 1997) by their anther locules not confluent at the apex, although dehiscent by oblique clefts (Smith, 1940: 501). While working on a taxonomic study of the Brazilian species of Hippocrateoideae as part of a study of the Neotropical species, I discovered a noteworthy new species from the rainforests around Manaus, in the Brazilian Amazon basin. Peritassa manaoara Lombardi, sp. nov. TYPE: Brazil. Amazonas: Reserva Flor. l)ucke, Man-aus-Itacoatiara, km 26, 02'53'S, 59'58'W, Igarape do Tinga, Floresta de Carnpinarana, 7 Dec. 1994, A. Vicentini 789 & E. C. Pereira (holotype, IAN; isotypes, G not seen, INPA not seen, K not seen, MO not seen, NY not seen, RB, SP not seen, U not seen). Figure 1. Haec species Peritassae laevigaine (IlHfffranlnsegg ex Link) A. C. Smith foliis et inflorescen ia strlctura affinis. sed inflorescenlia puberula, antheris globosis ct stigmale 3-lobato differt. Ab omnibus speciebus syimpatlricis 7onielene disco parietum ovarii libero et thecis in antherarumi dehiscentia non confluentibus dliflert. Liana, branches terete, new branches sparsely puberulous, older glabrescent, fissured. Leaves oppo-site to subopposile; stipules not seen, caducous; petioles 1.6-2 cm, canaliculate, glabrous; blades (15.4-)16.2-18.6(-19.8) x 6.5-6.8(-8.7) cm. elliptic, the base cuneate, the apex acute or acuminate, the margin entire and thickened, glabrous, c(hartaceous, drying brown on the adaxial side and light brown and minutely tuberculate on the abaxial side, or brown on both sides, the nerves drying cream on the abaxial side, venation brochidodromous, veins prominu lons on both sides, secondary veins inconspicuous. Inflorescence paniculate, (4.5-)6.3-6.7 X (2.5-)6.5-8.5(-10.5) cm,NoVON 17: 29-32. PUBLISHED ON 23 A'tILt 2007.
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