Showing posts with label Schnella. Show all posts
Showing posts with label Schnella. Show all posts

Monday, 22 February 2016

A synopsis of the neotropical genus Schnella (Cercideae: Caesalpinioideae: Leguminosae) including 12 new combinations



A synopsis of the neotropical genus Schnella (Cercideae: Caesalpinioideae: Leguminosae) including 12 new combinations

Liam Trethowan, Ruth Clark, Barbara Mackinder

Abstract


The genus Bauhinia sens. lat. formerly accommodated numerous species that have now been transferred to one of several segregate genera. One of those genera, Schnella, includes all neotropical liana species with tendrils. This study comprises a summary of the taxonomic and nomenclatural history of Schnella, and presents a list of names accepted under Schnella, including 12 new combinations. We recognise here a total of 53 taxa including 47 species. Distribution details for each taxon are given, illustrated with a map showing numbers of taxa within the TDWG regions of the neotropics. Within Schnella, there exist two morphologically and palynologically distinguishable groups of species. Further work, including a molecular-based study, will be needed to discover whether those two species groups are congeneric.

Monday, 25 November 2013

Schnella flexuosa (Moricand) Walpers

Pétalas alvas (f. 1)
Flores pediceladas (f. 2)
Racemo terminal (f. 3)
Folha unifoliolada, bilobada (f. 4)
Ramos rufos-tomentosos (f. 5)
Leguminosae, Caesalpinioideae, Cercideae, Schnella Raddi

No Brasil ocorrem 30 espécies das quais 20 são endêmicas (Vaz 2015). 
Schnella Raddi
Liana, caule plano-corrugado; tricoma presente no ramo, inerme, gavinha presente. Estípula basifixa, falcada. Filotaxia alterna-espiralada. Folha unifoliolada; folíolo lobado, ovado, ápice agudo, margem inteira, base arredondada; face adaxial glabra, face abaxial tomentulosa, nervação actinódroma, coriácea. Inflorescência terminal, racemo; brácteas breves. Flor breve-pediceladas, zigomorfas, monoclinas, hipógina; hipanto estriado, cálice campanulado, estriado, sépalas 5; corola dialipétala, pétalas 5, alvas; androceu dialistêmone, estames isodínamos, diplostêmone; gineceu simples, ovário súpero, pedicelado ou séssil, pluriovulados, estilete curto, estigma plano. Fruto legume típico, oblongo, plano, valva lignosas.
Schnella flexuosa (Moric.) Walp., Repertorium Botanices Systematicae. 5(4): 752. 1846. 

Fotos: Rubens Teixeira de Queiroz, Chapada dos Veadeiros, Goiás, Brasil.

Referências
Vaz, A.M.S.F. 2015. Schnella in Lista de Espécies da Flora do Brasil. Jardim Botânico do Rio de Janeiro. Disponivel em: <http://floradobrasil.jbrj.gov.br/jabot/floradobrasil/FB133267>.