Flora das cangas da Serra dos Carajás, Pará, Brasil: Rubiaceae

Abstract

ResumoEste estudo compreende as espécies de Rubiaceae que ocorrem sobre canga na Serra dos Carajás, estado do Pará, Brasil, incluindo chaves de identificação, descrições detalhadas, ilustrações e comentários morfológicos das espécies, bem como a sinonimização de dois nomes (Chomelia parvifolia e Tocoyena bullata). No total, foram registradas 48 espécies em 24 gêneros, entre as quais distinguem-se, em ambientes abertos, táxons da tribo Spermacoceae, com um gênero monotípico endêmico da região, Carajasia cangae, bem como diversas espécies de distribuição restrita (e.g., Borreria carajasensis, B. elaiosulcata, B. heteranthera e Mitracarpus carajasensis). Nos ambientes florestais encontrados sobre canga, o gênero com maior número de espécies é Psychotria (9 espécies). Palavras-chave: FLONA Carajás, florística, minério de ferro, novos sinônimos, taxonomia. AbstractThe present study comprises the Rubiaceae that occur on iron-stone (canga) at Serra dos Carajás, estado do Pará, Brasil, including identification keys, detailed descriptions, illustrations and comments regarding the species found, as well as the synonymization of two names (Chomelia parvifolia and Tocoyena bullata). A total of 48 species distributed in 24 genera were recorded, with a predominance of members from tribe Spermacoceae in the open areas, including a monotypic endemic genus, Carajasia cangae, as well as several species with restricted distribution (e.g., Borreria carajasensis, B. elaiosulcata, B. heteranthera and Mitracarpus carajasensis). The genus Psychotria, with nine species treated, had the highest number of species found mostly in the forest groves on canga substrate.

Edaphic Endemism in the Amazon: Vascular Plants of the canga of Carajás, Brazil

“…(Viana et al, 2018), Rubiaceae, 7 spp. (Zappi et al, 2017a), Rutaceae, 1 sp. (Pirani & Devecchi, 2018), Sapotaceae (Terra-Araujo & Zappi, 2018), Selaginellaceae (Góes-Neto et al, 2016), Styracaceae , Thymelaeaceae, 1 spp.…”

“…Borreria semiamplexicaulis and Ipomoea marabaensis were included as Rare for Brazil (Giulietti et al, 2009). However, these occur in other areas of the state of Pará and elsewhere (Zappi et al, 2017a), with I. marabaensis also occurring in Tocantins (Simão-Bianchini et al, 2016) and their status as rare plants needs to be reevaluated. 3.…”

“…Taxa that do not grow exclusively in CRC, thus not being considered edaphic endemic (sensu Kruckenberg, 2002). Marsdenia bergii is a robust climber that occurs in CGC however its distribution is not restricted to this substrate and, despite being classified as Rare for Brazil (Giulietti et al, 2009), has been found growing on granite within the area of the FLONA of Carajás (Fernandes et al, 2018), alongside Mitracarpus carajasensis (Zappi et al, 2017a) and Brasilianthus carajensis. It is possible that both species are new arrivals in the granite outcrop, following the opening of roads that link the outcrops, mining plants and other mines, as was established by (P.L.…”

“…4.6%) endemic; Rubiaceae, 48 spp., with one genus and 5 species (i.e. 10%) endemic (Zappi et al, 2017a); Eriocaulaceae, 10 spp., 2 (i.e. 20%) endemic (Watanabe et al, 2017); and Xyridaceae, 4 spp.…”

MORFOMETRIA DE FRUTOS E SEMENTES DE Palicourea racemosa EM UM FRAGMENTO FLORESTAL NA REGIÃO NORTE DE MATO GROSSO, BRASIL

“…Borhidi (Psychotria racemosa Rich), gênero recentemente ampliado, é um arbusto terrícola, de floresta úmida, da família Rubiaceae, que apresenta distribuição no México, Colômbia, Trindade, Guianas, Bolívia e em todas as regiões do Brasil (BFG, 2015;HOLLOWELL, 2016;BORHIDI, 2017;ZAPPI et al, 2017).…”