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

Abstract

ResumoO Parque Estadual da Serra Dourada é uma das áreas serranas mais preservadas do estado de Goiás, porém sua flora é pouco conhecida. Visando contribuir com o conhecimento da diversidade de Euphorbiaceae no bioma cerrado, efetuou-se o estudo taxonômico do gênero Croton neste Parque. Foram registradas 10 espécies: Croton antisyphiliticus, C. campestris, C. chaetocalyx, C. didrichsenii, C. glandulosus, C. gracilescens, C. heliotropiifolius, C. sclerocalyx, C. urucurana e Croton sp. Destas, a última é uma provável espécie nova, enquanto C. gracilescens e C. sclerocalyx estão sendo primeiramente ilustradas. É apresentada uma chave para identificação das espécies, bem como descrições, ilustrações e dados relativos à fenologia e distribuição geográfica. Palavras-chave: Crotoneae, diversidade, flora do Cerrado, taxonomia. AbstractSerra Dourada State Park is one of the most preserved montane areas in the state of Goiás, 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.

Revised delimitation of Croton campestris (Euphorbiaceae), including description of two new species, molecular phylogenetic, anatomical and micromorphological data

“…As such, the specimens identified as C. campestris by those authors, by Sodré et al (2014), and by Secco et al (2018), are C. subvillosus, which is different from C. campestris in terms of its herbaceous or subshrub habit up to 50 cm in height, with little branching, with leaf trichomes with lateral rays 1-2 mm long, short petiolate leaves ((petioles (6-) 12-50 times smaller than the leaf blades)), leaf blades with an acute or short attenuate base, 7-15 pairs of secondary veins, axes of the thyrses and external surfaces of the floral calyxes of both sexes with a hirsute indument, as well as the pedicels of staminate flowers 2.3-4.7 mm long. Croton campestris, however, is characterized by a subshrub or shrub habit up to 2 meters tall, densely branched, lateral rays of leaf trichomes 0.35-1 mm long, petiole only 3.8-10 (-13) times smaller than the leaf blade, the leaf blades with obtuse bases, slightly cordate, or less commonly acute, 5-10 pairs of secondary veins, the axes of the thyrsus and external surfaces of the calyxes of the flowers of both sexes tomentose, and pedicels of the staminate flower up to 2 mm long.…”

“…Information concerning latex colors, indument types, and flowers and fruits was primarily based on field observations. Species identifications and the confirmation of new species were based on the specialized literature (e.g., Müller Argoviensis 1866; 1873;Smith et al 1988;Webster 1993;Lima & Pirani 2003;Caruzo & Cordeiro 2007;Secco 2008;Carneiro-Torres 2009;Silva et al 2010;van Ee et al 2011;Sodré et al 2014;2017), analyses of types and original descriptions, and comparisons with collections from the aforementioned herbaria.…”

“…1). Detailed examinations of all of these species led us to: a) update the circumscriptions of C. campestris as well as C. subvillosus -a species that is often confused with the former in taxonomic and floristic studies of the genus in the midwestern region of Brazil (Sodré et al 2014;2017;Secco et al 2018); b) describe and illustrate C. hatschbachii and C. stellatorotatus as new species; c) propose 17 new synonyms and 14 lectotypes for names related to C. campestris; and d) update the geographic distributions, conservation statuses, and phenologies of all recognized species, with illustrations, photographs and maps. We also compared C. campestris, C. hatschbachii, C. stellatorotatus and C. subvillosus in terms of the anatomies of their leaves and the micromorphologies of their foliar trichomes, as studies of that nature have frequently been found to be valuable for separating taxa in the genus (e.g., Caruzo et al 2016;Sodré et al 2019;Sodré & Silva 2020).…”

Os gêneros Apuleia, Dimorphandra, Tachigali (Caesalpinioideae), Bauhinia, Schnella (Cercidoideae), Copaifera, Hymenaea e Peltogyne (Detarioideae) (Leguminosae) no Parque Estadual da Serra Dourada, Goiás, Brasil

“…Uma dessas unidades é o Parque Estadual da Serra Dourada situado na região oeste de Goiás. O parque já foi alvo de alguns estudos florísticos, dos quais podemos citar para a família Asteraceae (Moreira & Teles 2014;Guida & Teles 2015), Euphorbiaceae (Júnior et al 2013;Sodré et al 2014) e Leguminosae (Dantas & Silva 2013a;e Dantas & Silva 2013b), estes dois últimos abordando dois gêneros, entre os mais numerosos de Leguminosae-Caesalpinioideae, que são Chamaecrista Moench. e Senna Mill., respectivamente.…”