Renata Sebastiani

Estudos taxonômicos em Heteropterys subsect: Stenophyllarion (Malpighiaceae) no Brasil

Heteropterys is the second largest genus of Malpighiaceae, showing as sinapomorphy, schizocarpic fruits, each mericarp with a large dorsal wing with inferior margin thickened. According to the last revision of the genus, Heteropterys comprises two subgenus, four sections and six subsections. Recent studies pointed out the monophyletism of subsect. Stenophyllarion. The species of this group are vines distributed from southeastearn states of Brazil to Argentina, mostly in the Atlantic coastal forests. They are characterized by petioles with a pair of glands at the base, glabrous or glabrate leaves, and umbells with small short-peduncled flowers. Field work, anatomical studies and analysis of herbarium collections (including types) allowed us to recognize eight species: H. crenulata Mart. ex Griseb., H. fluminensis (Griseb.) W.R. Anderson, H. intermedia (A. Juss.) A. Juss., H. leschenaultiana A. Juss., H. microcarpa Skottsb., H. pauciflora (A. Juss.) A. Juss., H. wiedeana A. Juss., and H. brunnea Sebastiani & Mamede, a new species related to H. fluminensis. As a result of the revision of the subsection, 15 new synonyms are presented, 11 lectotypes and one neotype are designated, and H. microcarpa and H. wiedeana are reinstated. Key for species, descriptions, comments, illustrations, and distribution maps for all taxa are also presented.

New records on endangered and endemic species of Stigmaphyllon A. Juss. (Malpighiaceae) in Brazil

New records on three endangered and endemic species of Stigmaphyllon are presented: S. angustilobum extend its distribution in the State of Espirito Santo, S. crenatum extend its distribution in the State of Minas Gerais and S. macedoanum occurs also in the State of Mato Grosso do Sul.

Cactaceae from Reserva Biológica do Alto da Serra de Paranapiacaba, Santo André, São Paulo State, Brazil

A taxonomic treatment of Cactaceae species from Paranapiacaba Biological Reserve and surroundings is presented. An identification key and descriptions of 14 species, with notes regarding their ecology and conservation are included. The species identified were: Hatiora salicornioides (Haw.) Britton & Rose, Lepismium houlletianum (Lem.) Barthlott., Rhipsalis baccifera subsp. shaferi (Britton & Rose) Barthlott & N.P. Taylor, R. burchelli Britton & Rose, R. campos-portoana Loefgr., R. elliptica G. Lindb. ex K. Schum., R. floccosa Salm-Dyck ex Pfeiff., R. juengeri Barthlott & Taylor, R. neves-armondii K. Schum., R. olivifera N.P. Taylor & Zappi, R. paradoxa (Salm-Dyck ex Pfeiff.) Salm-Dyck, R. pulchra Loefgr., R. puniceodiscus G. Lindb. and R. teres (Vell.) Steud.

Malpighiaceae na Reserva Biológica do Alto da Serra de Paranapiacaba, Santo André, SP, Brasil

Reserva Biologica de Paranapiacaba has an important remnant of Atlantic Forest in Sao Paulo metropolitan region, located at Serra do Mar. A taxonomic treatment on Malpighiaceae from Reserva Biologica do Alto da Serra de Paranapiacaba is presented. We identified five genera and eight species: Byrsonima myricifolia Griseb., Heteropterys intermedia (A. Juss.) Griseb., H. nitida (Lam.) Kunth, H. patens (Griseb.) A. Juss., H. thyrsoidea (Griseb.) A. Juss., Mascagnia sepium (A. Juss.) Griseb., Hiraea fagifolia (D.C.) A. Juss, and Tetrapterys phlomoides (Spreng.) Nied. An identification key, descriptions, and illustration of the fruits of species are included.

An illustrated checklist of Malpighiaceae from the Chapada dos Veadeiros region, Goiás, Brazil

An updated checklist of Malpighiaceae from the Chapada dos Veadeiros region, Goias, Brazil, is presented. We recorded 78 species of this family of plants, which represent a higher diversity than previously reported for the region. About one third of all the Malpighiaceae species recorded for the Cerrado are found within the area, which shows the important role of the Chapada dos Veadeiros region in the conservation of this family in Central Brazil.

Two new species of Janusia (Malpighiaceae) from Brazil

Two new Brazilian species of Janusia are described and illustrated: Janusia diminuta, restricted to the Restinga vegetation in Northern Rio de Janeiro State; and Janusia paraensis, which is known from the Amazonian savanna vegetation in Para State. Their diagnostic features are pointed out and a discussion of their relations to other species of Janusia are provided herewith.

Palynological study of Janusia A. Juss. and related genera (Malpighiaceae)

This paper presents a palynological study of 14 Janusia species and seven species belonging Aspicarpa, Camarea and Cottsia to contribute to the taxonomic study of the Gaudichaudieae tribe. The pollen grains were examined under optical and scanning electron microscopy. The pollen grains are generally spheroidal or cuboidal, medium to large, 6-8-porate and display variable colpoids and ornamentations. Janusia pollen grains vary in their quantitative characteristics, apertures and ornamentation. In some Janusia species, we observed the presence of a lipid substance on the pollen grains, likely pollenkitt. The pollen morphology of the cleistogamic flowers of Janusia guaranitica is clearly distinct from the pollen grains of chasmogamous flowers in all species analysed. Janusia anisandra, Janusia caudata and Janusia christianeae possess harmomegathic mechanisms, and the presence of colpoids also in J. guaranitica (chasmogamous flower) may suggest a direct relationship between these species, although their presence is more frequent in more humid areas. The results of palynological analysis suggest that the studied genera cannot be delimited using palynological characteristics but that they may be helpful to distinguish among genera.