PlantaeDB Logo
Login Sign-up

Genus Roupala in Family Proteaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Roupala (Proteaceae) comprises approximately 65 species of evergreen trees and shrubs distributed across the Neotropics from Mexico to northern Argentina, with primary diversity in Brazilian Atlantic Forest, Amazonia, and the Guiana Highlands. The genus encompasses small understory trees to canopy emergents, reaching heights exceeding 35 meters in mature individuals.

Morphologically, Roupala is distinguished by spiral, petiolate leaves ranging from simple to pinnately compound with entire to dentate margins, persistent stipules that are often fused in pairs, and axillary or terminal racemose inflorescences. The small, hermaphroditic flowers possess four tepals that reflex at anthesis, four basally connate stamens, and a superior ovary containing 1-2 ovules on basal placentation. The fruit is a follicular pod containing 1-2 winged seeds adapted for wind dispersal.

Species diversity centers in eastern Brazil, where approximately 35 endemic species occur, with additional centers of endemism in the Venezuelan Guayana and Colombian Amazon. The genus occupies diverse habitats from lowland rainforest (50-800m elevation) to montane cloud forests (up to 2000m), often in areas with well-drained, acidic soils. Roupala demonstrates typical Neotropical biogeographic patterns, with several widespread species and numerous geographically restricted taxa.

Pollination mechanisms remain poorly documented, though the pendulous racemes and anthocyanin-pigmented flowers suggest ornithophily or entomophily. Chromosome counts consistently report n=14, establishing the base chromosome number for the genus.

Roupala has undergone significant taxonomic revision based on recent molecular phylogenetic studies. Johnston and Steyermark (1962) recognized 85 species, while subsequent treatments by Sleumer (1969) reduced this to approximately 60 species. Current circumscription excludes former sect. Edwardsia (now Ovidia), following phylogenetic evidence (Harrington et al., 2020). Alternative treatments persist regarding species limits, particularly within the R. montana complex.

The genus holds minor horticultural importance through a few cultivated ornamental species, notably R. pseudocordata and R. montana. While locally useful timber species exist, commercial exploitation remains limited by slow growth rates and patchy distribution. No species are widely cultivated crops or major timber sources.

Conservation challenges include extensive habitat loss from deforestation, with an estimated 40% of species potentially threatened due to restricted ranges and habitat specificity. Priority research gaps include comprehensive phylogenetic analysis and improved conservation assessments for data-deficient taxa.

Pick a Species to see its components: