Rodolfo Carneiro Sodré

A Dwarf Species of Manihot Mill. (Euphorbiaceae s. s.) from the Highlands of Goiás, Brazil

Abstract During the preparation of the Euphorbiaceae taxonomic treatment for the Chapada dos Veadeiros National Park, located in the state of Goiás, Brazil, we found a new species of Manihot. Manihot saxatilis is described and illustrated here. The morphological relationship of this species is discussed in comparison with M. stricta Baill., since we assume this species is the most morphologically similar to the new one. Based on morphological traits, the new species belongs to Manihot sect. Brevipetiolatae. The distribution, habitat, phenology, etymology, IUCN red list category, and a key to all species of Manihot sect. Brevipetiolatae are also provided.

A New Species of Croton L. (Euphorbiaceae s.s.) from the Brazilian Cerrado

Abstract Croton planaltoanus, a new species from the Brazilian Cerrado, is described and illustrated here. The morphological relationships of this species are discussed in comparison with C. inaequilobus, an endemic species of the Chapada dos Veadeiros Region, which resembles the new species morphologically. The new species is apparently endemic to the Brazilian Cerrado region, where it grows in “cerrado rupestre” and montane grasslands on rocky soils. The systematic position of C. planaltoanus in relation to the sections of Croton is also discussed.

Manihot (Euphorbiaceae s.s.) no Parque Estadual da Serra Dourada, Goiás, Brasil

Resumo O Parque Estadual da Serra Dourada compreende um mosaico vegetacional e e uma das areas serranas mais conservadas do estado de Goias. Com intuito de contribuir com a flora deste parque e com o conhecimento da diversidade das Euphorbiaceae no Cerrado s.l. apresenta-se aqui o tratamento taxonomico do genero Manihot . Foram encontrados 11 taxons, entre eles nove especies e duas subespecies: M. anomala Pohl, M. anomala subsp. pubescens (Pohl) D.J. Rogers & Appan, M. gracilis Pohl, M. irwinii D.J. Rogers & Appan, M. mossamedensis Taub., M. oligantha Pax, M. paviifolia Pohl, M. pentaphylla Pohl, M. pentaphylla subsp. tenuifolia (Pohl) D.J. Rogers & Appan, M. sparsifolia Pohl e M. xavantinensis D.J. Rogers & Appan. Sao apresentados aqui descricoes, chave de identificacao, ilustracoes, distribuicao geografica, alem de comentarios acerca da morfologia e das preferencias ecologicas das especies analisadas. Manihot in Serra Dourada State Park, Goias, Brazil Abstract The Serra Dourada State Park comprises a mosaic of vegetation and it is one the most conserved and diverse mountainous areas of Goias state. To contribute to the flora of this park and with knowledge of Euphorbiaceae diversity in the Cerrado s.l. vegetation a taxonomic treatment of the genus Manihot is presented here. Eleven taxa arranged in nine species were recognized: M. anomala Pohl, M. anomala subsp. pubescens (Pohl) D.J. Rogers & Appan, M. gracilis Pohl, M. irwinii D.J. Rogers & Appan, M. mossamedensis Taub., M. oligantha Pax, M. paviifolia Pohl, M. pentaphylla Pohl, M. pentaphylla subsp. tenuifolia (Pohl) D.J. Rogers & Appan, M. sparsifolia Pohl and M. xavantinensis D.J. Rogers & Appan. Descriptions, illustrations, comments on morphological similarities, geographic distribution and ecological preferences of species, and a key to identify are provided.

Morphological and anatomical evidence support a new wild cassava: Manihot fallax (Crotonoideae, Euphorbiaceae), from Mato Grosso, Brazil

Abstract During the preparation of the taxonomic treatment of Manihot in the Midwest Region of Brazil, a new species was found. Manihot fallax M.J. Silva & L.S. Inocencio is described, illustrated and morphologically compared with similar simple-leaved species. The conservation status, geographic distribution (including map), ecology, phenology and notes about leaf anatomy of the new species are given. The synonymisation of M. robusta M. Mend. & T. B. Cavalc. under M. attenuata Müll. Arg. and lectotypes for M. attenuata and M. brachystachys Pax & K. Hoffm are also proposed. An emended description of M. attenuata is proposed as the original description is incomplete as it lacks information on the pistillate flowers, fruits and seeds.

Croton L. (Euphorbiaceae) no Parque Estadual da Serra Dourada, Goiás, Brasil

Serra Dourada State Park is one of the most preserved montane areas in the state of Goias, but the flora is poorly known. As part of a survey of Euphorbiaceae diversity in Cerrado, a taxonomic study of the genus Croton was carried out in this park. We recognized 10 species: Croton antisyphiliticus, C. campestris, C. chaetocalyx, C. didrichsenii, C. glandulosus, C. gracilescens, C. heliotropiifolius, C. sclerocalyx, C. urucurana and Croton sp. The last species is probably a new taxon, while C. gracilescens and C. sclerocalyx are illustrated for the first time. A species key, descriptions, illustrations, as well as phenological and geographic distribution data are provided.

Hippomaneae (Euphorbiaceae) no Parque Nacional da Chapada dos Veadeiros, Goiás, Brasil

The Euphorbiaceae of the tribe Hippomaneae are complex and poorly studied taxonomically due to having small and homogeneous flowers. Based on monthly collections since 2011, analysis of herbarium collections and specific literature was performed the taxonomic treatment to the Hippomaneae present in the Chapada dos Veadeiros National Park, an area whose flora is rich and little known. Fifteen species belonging to five genera were found: Microstachys and Sapium, the most diverse, with nine and three species respectively, followed by Gymnanthes, Maprounea and Sebastiania with one species each. Sapium haematospermum is firstly recorded in the state of Goiás. Species identification key, species descriptions with comments and illustrations, besides the transference of Sebastiania anisodonta and S. salicifolia to the genus Microstachys and a lectotipification.

A new species of Croton L. (Euphorbiaceae) from the wet fields of Midwestern Brazil1

Abstract A new species, Croton uliginosus, from Midwestern Brazil is described and illustrated. It is related to Croton junceus Baill., from which it differs mainly in shape, margins and veins of leaf blade, position of acropetiolar glands, number of pistillate flowers in the rachis, presence of glands, shape of pistillate sepals, number of stamens, and length of fruiting pistillate calyx in relation to the fruits. The habitat, preliminary conservation assessment, periods of flowering and fruiting, and morphological relationships of the novel species with its closest species are also provided. Additionally, the geographical distribution map and color plates of the new species and C. junceus are provided. The latter is a species endemic to Midwestern Brazil but not yet revealed in photographs, whose taxonomy is still poorly known.

Croton rhodotrichus: A New Species of Croton Section Geiseleria (A. Gray) Baill. (Euphorbiaceae) from the State of Mato Grosso, Brazil

Abstract Croton section Geiseleria encompasses 82 species in the Americas, but its center of origin and diversity is in Brazil, where 53 species are distributed especially in areas of Cerrado, in the central part of the country. Taxonomic knowledge of several taxa of Croton section Geiseleria is still scarce, and they are frequently misidentified in Brazilian herbarium collections due to their very similar morphology. During a taxonomic study of this section in the Midwest region of Brazil, a new species was found in the state of Mato Grosso. Croton rhodotrichus is herein described, illustrated, and its relationships with the most morphologically similar species, C. glandulosus and C. hirtus, are discussed. Additionally, distribution, habitat, flowering, fruiting, and conservation status of the new species, as well as a key to identify all the species of Croton section Geiseleria present in the state of Mato Grosso are provided.

Novelties in Croton (Euphorbiaceae) from Goiás, Brazil

Abstract During a floristic survey of Croton in montane areas of the Cerrado biome of Central Brazil, a new species, Croton gracilirameus, was discovered and is herein described, illustrated, and compared to its putative closest relatives, C. agoensis and C. catariae. The new species most likely belongs to Croton section Geiseleria due to its stellate trichomes, leaves with glands at the apex of the petiole and margins, thyrses with a brief interruption between the pistillate and staminate flowers, and pistillate flowers with valvate sepals. A key to Croton gracilirameus and allied species, a synonymization of C. chaetocalyx under C. catariae, and new occurrence records of C. arirambae are also provided.