Jimi Naoki Nakajima

Asteraceae do Parque Nacional da Serra da Canastra, Minas Gerais, Brasil

A check-list of Asteraceae was carried out between February 1994 until January 1998, in Serra da Canastra National Park, which is located in Southern Brazil. All specimens are deposited at the herbarium of the Universidade Federal de Uberlândia, Minas Gerais, Brazil (HUFU). The Asteraceae is the most diverse family of the Serra da Canastra. The total number is 215 species, belonging to 66 genera, and 11 tribes. One significative result is the discovery of 27 new species, representing 19 genera of seven different tribes. Some of them belong to monotypic or small genera as Xerxes, Hololepis, Pseudobrickellia, and Inulopsis, and others to several genera which have great importance to the Brazilian Asteraceae flora, such as Lessingianthus, Chromolaena, Stevia, Mikania, Aspilia, Calea, and Senecio. This inventory has the highest number of species recorded in one study area in Brazil.

Estrutura da vegetação arbórea de um remanescente ecotonal urbano floresta-savana no Parque do Sabiá, em Uberlândia, MG

The study evaluated the tree component structure of vegetation fragments consisted of semideciduous forest, two woody savannas (cerradao), inserted in an urban forest remnant, also consisting of a fragment of swamp forest. The survey comprised 1.32 hectares, where all trees with ≥ 5 cm perimeter at breast height were recorded. A total of 141 species distributed in 46 botanical families with Shannon diversity index of 3.99 were recorded. Fabaceae showed the greatest species richness in the survey, corroborating the pattern found in other studies on the Cerrado Biome. Maprounea guianensis had the largest density, frequency and dominance relative values in the remnant. The semideciduous forest presented the largest floristic richness and characteristic species of that formation when compared with other studies. Hirtella glandulosa showed the largest importance value in the cerradao 2, suggesting the existence of a dystrophic soil in this physiognomy. The similar structural characteristics between cerradao 2 and semideciduous forest, tree species diversity significantly larger in cerradao 2 than in cerradao 1, besides the presence of typical species of swamp forests and semideciduous forest in cerradao 2 confirm the occurrence of transition areas in the remnant. Few individuals were recorded in the smallest diameter classes in cerradao 1. Continuous and varied human disturbances probably are responsible for this, indicating the need for conservation and management preventive actions of this biological patrimony.

The Asteraceae flora of the Serra do Ibitipoca: analyses of its diversity and distribution compared with selected areas in Brazilian mountain ranges

A checklist for the Asteraceae of the Parque Estadual do Ibitipoca is presented, with an analysis of the familys geographic distribution in 10 Brazilian montane rocky fields (campos rupestres and campos de altitude). A total of 111 species belonging to 50 genera, placed in 12 tribes was found. The Eupatorieae, the Vernonieae, the Astereae, Baccharis, Mikania and Lessingianthus were the most diverse tribes and genera, respectively. The Ibitipoca Asteraceae flora was most similar to those of Itacolomi (Minas Gerais State) and Itatiaia (Rio de Janeiro State). Cluster and ordination analyses indicated that the dominant vegetation and geoclimate were important in determining the local composition, but the relationships according to the similarity values among areas were shown only in the ordination analyses. In addition to local factors, historical biogeographic elements are essential to understand the distribution of Asteraceae in these areas.

Chromosome studies in some Stevia. Cav. (Compositae) species from Southern Brazil

Karyotypes of six species of the genus Stevia from Southern Brazil were studied, utilizing root tip metaphases. All species were diploid with 2n = 22 chromosomes. It was possible to identify each species by chromosome morphology. The basic chromosome number for Brazilian species of Stevia is X = 11. This number is also found in almost all South American species. We suggest that in Stevia there is an evolutionary trend toward chromosomal rearrangement, caused mainly by pericentric inversions. It was found that, in addition to aneuploidy and polyploidy, chromosomal rearrangements are common in the tribe Eupatorieae.

Comparative analysis of red lists of the Brazilian flora: Asteraceae

A familia Asteraceae e de grande representatividade na composicao floristica do Brasil, e se destaca nas listas da flora ameacada brasileira devido ao grande numero de especies ameacadas e com ausencia de dados que permita uma definicao do status de conservacao. A analise comparativa das Listas Vermelhas da Flora do Brasil para Asteraceae e de importância para caracterizar o verdadeiro grau de ameaca das suas especies diante do crescente processo de degradacao ambiental. O estudo estabelece as diferencas dessas listas e diagnostica as areas e os generos mais ameacados e/ou deficientes em dados. A analise foi baseada na Primeira Lista Oficial da Flora Brasileira, na Revisao da Lista realizada pela Fundacao Biodiversitas e na Lista Oficial Atual. Os dados foram organizados em especies ameacadas e deficientes em dados, e foram quantificados por genero e numero de especies. As especies ameacadas foram quantificadas tambem por categoria de ameaca. O Cerrado, a Regiao Sudeste, o estado de Minas Gerais e os generos Lychnophora Mart., Richterago Kuntze e Vernonia Schreb. possuem os maiores numeros de especies ameacadas, e Aspilia Thouars, Baccharis L., Calea L., Eupatorium L., Mikania Willd., Piptocarpha R.Br. e Senecio L. possuem os maiores numeros de especies deficientes em dados. Pela nao divulgacao dos criterios da Lista Oficial atual, a Lista Vermelha da Fundacao Biodiversitas reflete melhor a situacao de ameaca das especies de Asteraceae no Brasil. Portanto, e um importante instrumento de subsidio aos projetos para a preservacao de especies ameacadas e deficientes em dados.

Two New Species of Heterocoma (Asteraceae: Vernonieae) and a Broadened Concept of the Genus

Abstract A new concept of the genus Heterocoma is presented based on morphological and anatomical evidence. The genus is characterized by the combination of foliose subinvolucral bracts, fimbrillate or paleaceous receptacles, glabrous cypselae, and a caducous biseriate pappus (at least the inner series). A putative synapomorphy of the genus is the presence of phytomelanin in the cypselae walls. The monotypic genera Bishopalea, Sipolisia, and Xerxes are synonymized under Heterocoma with the following new combinations: Heterocoma ekmaniana, Heterocoma erecta, and Heterocoma lanuginosa. Two new species, Heterocoma gracilis and Heterocoma robinsoniana, are described and illustrated. The genus is endemic to the campos rupestres of the Brazilian Central Plateau. A key to the six species recognized in Heterocoma is provided.

Two New Species of Richterago Kuntze emend. Roque (Compositae, Mutisieae) from Minas Gerais and Goias, Brazil

Richterago Kuntze (Compositae, Mutisieae) was recently re-established to include species previously placed in Actinoseris (Endl.) Cabrera and Gochnatia sect. Discoseris Cabrera. This genus comprises a total of ten Brazilian species (Roque & Pirani in press) and is a monophyletic clade on the basis of leaf anatomy, as well as other morphological and palynological characters (Roque 1999). The genus Richterago is very closely related to Gochnatia Kunth and lanthopappus Roque & D. J. N. Hind (Roque & Hind 2001), because of the presence of apiculate to acuminate anther appendages. Richterago is characterized by its predominantly herbaceous to sub-shrubby habit, rosette-forming or alternate leaves, pinnate venation, discoid homogamous or radiate heterogamous capitula, and especially by the uniseriate pappus of 25 42 bristles that are united at the base into a fleshy straw coloured ring (Roque 1999). Richterago is endemic to Brazil and has five species restricted to the Serra do Espinhaeo, Minas Gerais State, and another R. discoidea (Less.) Roque which also occurs disjunctly in Bahia State. Richterago amplexifolia (Gardner) Roque and R. polymorpha (Less.) Roque, are widely distributed in Minas Gerais State. Richterago suffrutescens (Cabrera) Roque is endemic to a single locality at Sao Joao del Rey, Minas Gerais State, while Richterago radiata (Vell.) Roque has the widest geographic distribution in the genus, reaching Distrito Federal and the states of Goiais, Minas Gerais, Sio Paulo, and Paranai (Roque & Pirani 1997 and Roque & Pirani, in press). Two new species, Richterago campestris and R. petiolata, occurring respectively in southern Minas Gerais State (Sao Joao Del Rey, Lavras, Itutinga and Sio Tome das Letras) and Goiis State (Chapada dos Veadeiros), were also collected in Serra da

Senecio albus, a new species of Senecio sect. Adamantina (Senecioneae – Asteraceae) with an emendment to the section

SummarySenecio albus J. N. Nakaj. & A. M. Teles, a new species of Senecio (Senecioneae – Asteraceae), is described from the National Park of Serra da Canastra, Minas Gerais, Brazil. The new species shares discoid capitula with S. gertii Zardini and is assigned to sect. Adamantina. This character is not in the circumscription for the sect. Adamantina and thus the description of the section is emended accordingly. A key to species of Senecio sect. Adamantina is provided.

Asteraceae Dumort nos campos rupestres do Parque Estadual do Itacolomi, Minas Gerais, Brasil: Barnadesieae e Mutisieae

The study of the tribes Barnadesieae and Mutisieae is part of the floristic inventory of Asteraceae species in the rocky fields (campos rupestres) of the Parque Estadual do Itacolomi (PEI) in Minas Gerais. The collections were carried out between in the period from August 2005 to August 2007. For the two tribes this study identified 21 species belonging to six generas: Dasyphyllum Kunth with four species and one variety; Chaptalia Vent. (four species), Gochnatia Kunth. (three species), Mutisia L.f. (one species), Richterago Kuntze (six species) and Trixis P. Br. (three species). Most of these species are restricted to the rocky fields of the Espinhaco Range or vegetated areas near the transition, being four endemic of the Minas Gerais states. Keys for the identification of genera and species, descriptions, taxonomic commentaries, information about the geographical distributions of species and illustrations are presented.

A new species of Lepidaploa (Vernonieae - Asteraceae) from Southeastern Brazil

Abstract Lepidaploa opposita , a new species from the Atlantic Forest in southeastern Brazil, is described and illustrated.The new species is readily distinguished from other Lepidaploa species by the opposite leaves. This characteris very unusual in this genus, as well as in subtribe Lepidaploinae and tribe Vernonieae.Key words: Atlantic Forest, Compositae, Lepidaploinae, taxonomy. Resumo Lepidaploa opposita , uma nova especie da Mata Atlântica no sudeste brasileiro, e descrita e ilustrada. A novaespecie distingue-se das demais do genero pelas folhas opostas. Essa caracteristica e incomum no genero, bemcomo na subtribo Lepidaploinae e tribo Vernonieae.Palavras-chave: Floresta Atlântica, Compositae, Lepidaploinae, taxonomia. A new species of Lepidaploa(Vernonieae - Asteraceae) from Southeastern Brazil Uma nova especie de Lepidaploa(Vernonieae - Asteraceae) do Sudeste do Brasil Aristonio M. Teles ¹, Marcos Sobral 2 & Jimi N. Nakajima 3 Rodriguesia 61(1): 101-103. 2010 http://rodriguesia.jbrj.gov.br