Consulta: subjectFacets:"Helieae"
Registros recuperados: 3
Data/hora: 10/06/2024 02:26:49

Two new Brazilian species of Tachia (Gentianaceae: Helieae)
Provedor de dados: 16
Autores: Struwe, L.; Kinkade, M.P.; Maas, P.J.M.
Two new species of Tachia (Gentianaceae: Helieae) are described from Brazil. They share the unusual characteristic of quadrangular, winged stems, formerly only known from Tachia longipes in Suriname. They differ from this species in their larger, winged, keeled, and long-acuminate calyx lobes. Tachia lancisepala, spec. nov., is only known from one collection from the State of Rondônia in Brazil, and has unusually large and broadly funnelshaped corollas and ovate leaves with winged petioles. Tachia siwertii, spec. nov., has been found in three separate areas in southern Amazonas and Pará (Brazil) and is characterized by more elliptic leaves, unwinged petioles, and a narrower corolla than T. lancisepala.
Tipo: Article / Letter to the editor
Palavras-chave: Gentianaceae; Helieae; Tachia; Neotropics; Systematics; Taxonomy; New species.
Ano: 2005
URL: http://www.repository.naturalis.nl/record/524805

A new species of Sipapoantha (Gentianaceae: Helieae) from northern Brazil
Provedor de dados: 16
Autores: Lepis, K.B.; Maas, P.J.M.; Struwe, L.
A new species from Gentianaceae (tribe Helieae) is described from northern Brazil. Sipapoantha obtusisepala sp. nov. is distinct from the previously single member of the genus, Sipapoantha ostrina, by having a woody and branched habit, sessile and ovate leaves with an acute apex, and a smaller calyx with circular lobes. Sipapoantha obtusisepala is based on somewhat incomplete material and tentatively placed in Sipapoantha based on the presence of key generic characters such as coriaceous leaves with strongly revolute margins and blue corollas. It has only been recorded from one locality in the Brazilian-Guyana border area in the state of Roraima.
Tipo: Article / Letter to the editor
Palavras-chave: Floristics; Gentianaceae; Helieae; Morphology; Neotropics; New taxa; Sierra Baeta; South America.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/525073

Are stem nectaries common in Gentianaceae Juss.?
Provedor de dados: 39
Autores: Dalvi,Valdnéa Casagrande; Meira,Renata Maria Strozi Alves; Azevedo,Aristéa Alves.
ABSTRACT Extrafloral nectaries (EFNs) are specialized structures that produce and release nectar and are located on leaves, cotyledons and, more seldomly, stems. Peculiar leaf nectaries have been described for thirty-three Neotropical species of Gentianaceae, while stem nectaries have been reported for only nine. The aim of this study was to verify the occurrence of stem EFNs within Gentianaceae and investigate the existence of a correlation between their occurrence and the geographical distribution of species. Samples of internodal regions from field and herbarium specimens were submitted to standard light microscopy techniques. Data regarding the geographical distribution of species were acquired from herbarium specimens and the literature. A total of 37...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coutoubeinae; Helieae; Potalieae; Saccifolieae; Secretory structures.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300403