Trixis forzzae (Compositae: Mutisieae), a new species from Minas Gerais, Brazil Rafael Augusto Xavier Borges 1 & Mariana Machado Saavedra 1 Summary. The new species Trixis forzzae Borges & Saavedra, from Serra do Ibitipoca, Minas Gerais, Brazil is des- cribed and illustrated. Taxonomic relationships with similar species and those of similar geographical distribution are discussed. Key Words. campo rupestre, Compositae, flora, taxonomy. Introduction Trixis P. Browne is represented by up to 60 species and is included in subtribe Nassauviinae (Compositae, Mutisieae) (Hind 2007). It is distinguished from other genera in the subtribe by the presence of capitula that are never solitary, with pubescent and epaleaceous receptacles (Katinas 1996). The genus has a neotropical distribution, ranging from the southern United States to central Argentina; 14 species are recorded from Brazil, mainly occurring in Minas Gerais and São Paulo states (Katinas 1996; Hind 2000). The Espinhaço and Mantiqueira Ranges in south- eastern Brazil have high levels of plant species richness and endemicity, with a high concentration of Compo- sitae species documented (Giulietti & Pirani 1988; Harley 1995; Safford 1999; Giulietti et al. 2005). The former range is predominantly located in the Cerrado biome and the latter in the Atlantic Forest (Giulietti & Pirani 1988; Safford 1999). The Serra do Ibitipoca is located in a transitional area between these ranges (Map 1), and comprises many different habitats, the most dominant of which is campo rupestre vegetation (Menini-Neto et al. 2007). Despite the importance of mountain systems for plant species diversity and endemism in the tropics, several Brazilian mountains are still taxonomically unknown and many are not included in conservation units (Martinelli 2007). Recently, during work for the Flora do Parque Estadual do Ibitipoca, a new species of Trixis was discovered which is described and illustrated below. Trixis forzzae Borges & Saavedra sp. nov. T. glaziovii Baker affinis sed caulibus lanuginosis, non alatis, foliis chartaceis, non rosulatis et inflorescentia corymbosa differt. Typus: Brazil, Estado de Minas Gerais, 27 May 2005, Saavedra, Forzza, Andrade & Pereira 239 (holotypus RB!; isotypus K!). http://www.ipni.org/urn:lsid:ipni.org:names:77104345-1 Erect subshrub 0.5 – 1 m. Stem woody, sparsely leafy, densely woolly, with simple, eglandular, rusty hairs. Leaves spirally arranged, sessile, (2.5 –) 3.5 – 9 (– 12) × (0.8 –)1 – 2.5 (– 3.5) cm, chartaceous, oblanceolate to lanceolate, base attenuate, apex acute, margins minutely dentate, venation reticulodromus, abaxially woolly with prominent midrib, adaxially hirsute. Inflorescence terminal, with corymb-like branches, bracteolate, bracteoles 0.6 – 1.6 (– 2) × 0.3 – 0.7 (– 0.9) cm, oblong to lanceolate, base obtuse, apex acute, margin entire, both surfaces hirsute, hairs densely grouped on midrib and margins. Capitula pedicellate, pedicels (0.7 –) 1.5 – 6 cm long, woolly; involucre hemispherical, biseriate, external phyllaries c. 8, leafy, 7 – 8 × 2 – 3 mm, oblong, hirsute, internal phyllaries c. 23, rigid, c. 10 × 2 mm, lanceolate; receptacle epaleaceous, dense pubescent. Florets hermaphrodite, c. 58, yellowish; corolla 1 – 1.2 cm long, glabrous, outer lip c. 6 × 3 mm, erect to slightly revolute, inner lip 4 – 5 × 1 mm, coiled; anther c. 6 mm long, apical anther appendages lanceolate, basal anther appendages c. 2 mm long, glabrous; style c. 8 mm long, style branches c. 1.5 mm long. Cypselas c. 6 mm long, cylindrical, base truncate, with 8 longitudi- nal ribs, hirsute, glandular; pappus 1-seriate, 8 – 9 mm long, barbellate, pale yellow, persistent. Fig. 1. DISTRIBUTION. Only recorded from Serra do Ibitipoca in southern Minas Gerais state, Brazil. Accepted for publication September 2009. 1 Programa de Pós-Graduação em Botânica, Escola Nacional de Botânica Tropical, Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 2040, 22460-030, Rio de Janeiro, Brazil. e-mail: rafaelborges@jbrj.gov.br KEW BULLETIN VOL. 65: 65–68 (2010) © The Board of Trustees of the Royal Botanic Gardens, Kew, 2010