On two new species and one new variety of Dicranostyles (Convolvulaceae) collected in the Guianas and Amazonia

In the genus Dicranostyles two new species (D. guianensis and D. solimoesensis) and one new variety (D. villosa Ducke var. lasiocalyx) are described

Wood structure of trigonobalanus excelsa g. lozano-c., hdz-c. and amp; henao (fagaceae)

General characters: Hardly any differentiation in sapwood and heartwood. The wood greyish middle brown, with a reddish tinge. On the transverse surface growth rings not visible, the wide rays distinct with the naked eye as lighter coloured stripes. The grain straight, the texture rather fine; very hard and difficult to cut across the grain.General characters: Hardly any differentiation in sapwood and heartwood. The wood greyish middle brown, with a reddish tinge. On the transverse surface growth rings not visible, the wide rays distinct with the naked eye as lighter coloured stripes. The grain straight, the texture rather fine; very hard and difficult to cut across the grain

Valdivian ecosystems in the Late Cretaceous and Early Tertiary of Antarctica: further evidence from myrtaceous and eucryphiaceous fossil wood

Cool temperate rainforests growing on the flanks of the Andes and along the Coastal Range in Valdivia (Chile) today provide the closest analogue for the fossil floras of Antarctica during the Eocene. This paper records key Valdivian elements in a Maastrichtian to Eocene wood flora that extends the evidence for a Valdivian analogue back as far as possibly the Late Cretaceous. Here we record the first occurrences of myrtaceous and eucryphiaceous wood taxa from the Maastrichtian-Palaeocene sediments of the James Ross Basin. In addition, a previously unrecorded morphotype is described and assigned to the form genus Antarctoxylon which Poole and Cantrill erected for fossil angiosperm woods of Antarctica with uncertain taxonomic affinities. This increases the number and range of the described morphotypes from the Antarctic Peninsula and helps further our understanding of the southern high latitude angiosperm dominated floras

‘Unknown yellow’: Pibiria, a new genus of Passifloraceae with a mixture of features found in Passifloroideae and Turneroideae

In 1993, a shrub with yellow flowers reminiscent of but obviously distinct from Turnera was found near Mabura Hill in central Guyana, which was recollected in 2000. This paper offers a morphological description including leaf and wood anatomy and pollen morphology in addition to a phylogenetic analysis based on plastid DNA. Thanks to these studies, the mysterious species can now be assigned a position within the larger context of Passifloraceae. Our molecular results also show that the ‘unknown yellow’, as the plant became informally known, belongs to Passifloraceae, in which it is well supported as sister to Turneroideae. It is here described as the new genus and species, Pibiria flava, and because it lacks several floral characters typically (but not universally) found in this subfamily (heterostylous, fused sepals/petals, adnation of the stamens to the calyx, presence of a corolla and clawed petals), we also propose a new subfamily, Pibirioideae, to accommodate it