Diversity of arborescent lineages of Crotoneae (Euphorbiaceae) in the Brazilian Atlantic Rain Forest

Abstract

cymules in Croton), and stamens in bud (erect in Brasiliocroton vs. inflexed in Croton). Key to the species of Brasiliocroton from the Atlantic Rain Forest 1a. Indument on young branches whitish to ochraceous; inflorescences terminal, always bisexual; sepals of the pistillate flowers united; capsules smooth, covered by dendritic trichomes .

A new species of dragon’s blood Croton (Euphorbiaceae) from Serra dos Órgãos (Rio de Janeiro, Brazil)

“…Arg. is also similar to C.rizzinii , but it occurs in deciduous forest and in transitional areas between the Cerrado and the ARF in the state of Minas Gerais (Santos et al 2017). Both species have ovate to cordate and pubescent leaves, two acropetiolar glands and campanulate pistillate flowers with sepals covering the entire ovary.…”

“…Another character distinguishing it from its most similar species in the ARF is the size of seeds, which are the smallest in size amongst them (Table 1). Amongst the ARF Cyclostigma species, Crotonrizzinii appears to be most similar to C.celtidifolius (Santos et al 2017; Caruzo and Cordeiro 2007). Both species occur sympatrically and syntopically and can be confused by their similar ovate to cordate and pubescent leaves, trinerved at the base to palminerved venation, short-stipitate to stipitate petiolar glands on the abaxial side of the petiole and subglobose fruits.…”

“…The comparison with related species was undertaken using specimens from the herbaria R and RB, as well as photographs of specimens, including types, from herbaria F, G, K, NY, P, US and W (acronyms follow Index Herbariorum, available at https://sweetgum.nybg.org/science/ih/). We also used protologues of Croton species known from the ARF and recent floristic studies, particularly that of Santos et al (2017). Morphological terms follow Hickey and King (2000) and Radford et al (1974) for leaf morphology, Webster et al (1996) and Feio et al (2018b) for trichomes and Vitarelli et al (2015) and Feio et al (2016) for secretory structures.…”

“…(Berry et al 2005), is well represented in this region. Of the 305 species of Croton known for Brazil, 96 occur in the ARF (Flora do Brasil in prep), of which 21 species are trees (Santos et al 2017). Amongst these arborescent lineages, C.sect.Cyclostigma is the most diverse in the ARF, having nine species (Santos et al 2017).…”

Diversity of Croton (Euphorbiaceae) in the Itatiaia National Park, Brazil

“…Arg., occurs exclusively in the higher region of the park, in high elevation grasslands (Figs. 2; Croton alchorneicarpus is endemic to Serra da Mantiqueira, in the states of Minas Gerais, São Paulo and Rio de Janeiro states, in Montane Ombrophilous Forests (Santos et al 2017). In the INP, it is commonly found only at the 'plateau', in Montane and High Montane Ombrophilous Dense Forest, between 1,200 and 2,320 m of elevation.…”