A new species of Passiflora is described from reforested post bauxite-mined area in the National Forest of Saracá- Taquera in the Brazilian state of Pará. The species is illustrated and its affinities with related species are discussed, and a key to the species of supersection Laurifoliae, series Quadrangulares is presented. The series Quadrangulares is composed of four species that constitute a small complex of large-flowered and large-fruited passionflowers with 3–4- angulate-winged stems that occurs naturally in the moist lowlands from Nicaragua to Brazil and French Guiana. However, among the four species of the series, Passiflora trialata is closely related to the new species by the 3-angular stems, the color and shape of sepals and petals, the 3-angular petioles and peduncles, and the single operculum.

This paper presents new records of Passiflora L. from the Brazilian Amazon, contributing to the knowledge about the taxonomy and distribution of Passifloraceae in Brazil. The following species are reported for the first time: Passiflora garckei Mast. in Brazil; Passiflora candida (Poepp. & Endl.) Mast. in Amapá state; P. retipetala Mast. in Pará state; and P. tholozanii Sacco in Maranhão state.

The revegetation of steep slopes after mining and infrastructure projects is not an easy task. To enhance the effectiveness of revegetation projects, the present study aimed to review (i) specific challenges of steep slope revegetation, (ii) ecological succession patterns in similar environments, (iii) soil conditioning and revegetation strategies to enhance vegetation cover, (iv) the importance of microorganisms to enhance steep slope revegetation, and (v) the functional plant traits necessary to establish on steep slopes. In general, steep slopes are characterized by high bulk densities, potentially toxic elements, and low water and nutrient availability. Additionally, high temperature and elevated radiation constrain the soil conditioning and vegetation cover establishment. Lessons from ecological succession in natural steep slope habitats show that steep slope revegetation is a long-term process. Planting strategies, including hydroseeding and geotextiles, may enhance the implementation of vegetation cover. Different plant functional groups show adaptations necessary for establishment in steep slope environments, and mixtures of species containing different functional groups can promote diverse and resilient plant communities. Promising species may be retrieved from local rupestrian ecosystems, as these floras are adapted to shallow, oligotrophic soils. Further research on combining methods of soil conditioning with individual planting and/or seeding strategies of carefully selected species is necessary to enhance steep slope revegetation and rehabilitation, contributing to slope stability, erosion reduction, and carbon fixation in the long term.

Passiflora echinasteris from a secondary vegetation area on the Great Curve of the Xingu River, in the Brazilian Amazon, is newly described. It belongs to the series Serratifoliae with three other Brazilian species. The new species is illustrated and its affinities with related species are discussed, and a key to the Brazilian species of the series is provided.

A new species of Uleiorchis from Serra dos Carajás National Forest, Pará, Brazil, is described. This is the fourth species of this mycoheterotrophic genus. The species is illustrated, its affinities with related species are discussed, and a key to the species of the genus is presented. The new species differs from U. ulei, U. pratënsis and U. liesneri by the extremely elongated pedicel, the ligulate lip with a distal round dilatation, and by the elliptic, smooth stigmatic zone.