Efigênia de Melo

As espécies de Coccoloba P. Browne (Polygonaceae) da Amazônia brasileira

The genus Coccoloba is represented in Brazilian Amazonia by twenty three species: Coccoloba acuminata Kunth, C. arborescens (Vell.) R. A. Howard, C. ascendens Duss ex Lindau, C. brasiliensis Nees & Mart., C. charitostachya Standl., C. conduplicata Maguire, C. coronata Jacq., C. declinata (Vell.) Mart., C. densifrons Mart. ex Meisn., C. excelsa Benth., C. gentryi R. A. Howard, C. latifolia Lam., C. lehmannii Lindau, C. lucidula Benth., C. marginata Benth., C. mollis Casar., C. ovata Benth., C. paraensis Meisn., C. parimensis Benth., C. ramosissima Wedd., C. savannarum Standl., C. striata Benth., and C. tenuiflora Lindau. Among that only C. paraensis occurs exclusively in Brazilian Amazonia. C. charitostachya, C. conduplicata, C. coronata, C. gentryi, C. lehmanni and C. savannarum are cited for the first time in Brazil. The major characters of taxonomic relevance are the petiole position in relation to ochrea, the inflorescence ramification, the relative dimensions of bracts and ochreolae, the fruiting perianth and pericarp characters. An identification key, descriptions, and illustrations are given for all taxa, as well as comments about geographic distribution, habitats and phenological dates.

Plantas vasculares das áreas alagadas dos Marimbus, Chapada Diamantina, BA, Brasil

Swampy vascular plants are important components of tropical ecosystems although barely studied in the Brazilian Northeast. This paper goals at the identification of vascular plants of Marimbus, a swampy area in the Chapada Diamantina, Bahia, discussing geographic distribution and biological specter aspects. It also presents a comparison with other floristic surveys in swampy areas. 130 species in 46 families were registered. The family Cyperaceae was the most abundant (15%), followed by Rubiaceae (10%), Poaceae (8%), Myrtaceae (7.6%), Leguminosae (6.8%) and Polygonaceae (3.8%). Amphibious plants are the most common ones (58%), the emergent, floating (fixed or free) and submerged ones make up to 39% of the flora, which presents 25% of nanophanerophytes, 13% of geophytes and 12% of microphanerophyte. Most species present neotropical distribution (34%), many are ruderal (17%) and some are multicontinental (9%). This flora is less dissimilar to that from Pantanal Matogrossense.

Levantamento da família Polygonaceae no estado da Bahia, Brasil: espécies do semi-árido

This research is a survey of the Polygonaceae species distributed in semi-arid zone of state of the Bahia. In that area the family is represented by the following genera with their respective species: Coccoloba (11): C. alagoensis, C. alnifolia, C. brasiliensis, C. bullata, C. confusa, C. fastigiata, C. mosenii, C. ochreolata, C. scandens, C. schwakeana and C. warmingii; Polygonum (5): P. acuminatum, P. ferrugineum, P. hispidum, P. hydropiperoides and P. punctatum; Ruprechtia (3): R. apetala, R. laxiflora and R. ramiflora; Rumex (1) R. crispus and Triplaris (1) T. gardneriana. Key to the genera and species, descriptions and illustrations are presented for the majority of the species studied.

Schizaeales da Chapada Diamantina, Bahia, Brasil

The Chapada Diamantina is part of the Cadeia do Espinhaco located in the center of Bahia state. It lies within the Caatinga biome and comprises 58 municipalities. This paper reports on a floristic survey, descriptions and illustrations of 11 species of Schizaeales from the Chapada Diamantina, providing identification keys for families and species. These species were: Anemia dentata Gardner ex Field & Gardner, A. ferruginea Humb. & Bonpl. ex Kunth, A. hirsuta (L.) Sw., A. oblongifolia (Cav.) Sw., A. phyllitidis (L.) Sw., A. rutifolia Mart., A. tomentosa (Savigny) Sw. and A. villosa Humb. & Bonpl. ex Willd., Lygodium venustum Sw., L. volubile Sw., Schizaea elegans (Vahl) Sw.

Confirmação da ocorrência de Rumex cuneifolius Campd. (Polygonaceae) no Brasil

Rumex cuneifolius is native from Peru, Bolivia, Chile, Argentina and Uruguay, and introduced in North America, Europe and Australia due to its medicinal potential, and edible and forage qualities. The species was cited for Sao Paulo in Flora Brasiliensis, but there is no record in herbaria of that state. Its occurrence in Brazil was recently confirmed in Rio Grande do Sul, based on a population found in rural area of Cangucu. For this work we performed review of literature and regional herbaria, collection of specimens, observed populations in field and studied the external morphology of R. cuneifolius. The species is recognized by oboval-lanceolate leaves, inflorescences without foliaceous bracts and fruits with valves with entire margin and well developed callus oblong on the three wings. In Rio Grande do Sul it occurs in ruderal areas.