In this work, a morpho-anatomical study of the leaves, stems and roots of Solanum torvum Sw. was performed with the objective of providing a macroscopical and microscopical morphodiagnosis for its characterization. The species is popularly called "jurubeba-branca" in the Northeastern Brazil and is used in folk medicine to treat liver diseases, tuberculosis, and as antianemic. Anatomical studies were done by paradermic sections of the leaf blade (adaxial and abaxial surfaces), and cross sections of leaves (blade and petiole), stems and roots. The sections were clarified and stained with safranin and/ or astrablue, observed and photographed on light microscope. Histochemical tests were carried out in cross sections of leaves, stems and roots and assayed for specific reagents. The leaves are chartaceous, ovate to elliptic, with lobed margins, oblique at the base. The leaf is amphistomatic with anisocytic and anomocytic stomata simultaneously, and the epidermal cells, in face view, have anticlinal walls sinuate on the upper surface and wavy on the lower surface. The mesophyll is dorsiventral; the midrib has a central bicollateral vascular bundle; and the petiole has three or fourone. The stem shows external phloem, xylem, internal phloem and a parenchymatic pith. The root is axial and striate longitudinally and the secondary xylem is a massive cylinder. The macroscopical and microscopical vegetative characters constitute a set of diagnostic parameters to the studied species.

Neste trabalho apresenta-se o tratamento taxonômico do gênero Solanum, como parte do projeto "Flora da Paraíba", que vem sendo realizado com o objetivo de identificar e catalogar as espécies da flora local. Realizaram-se coletas, observações de campo e estudos morfológicos para as identificações, descrições e ilustrações botânicas, com o auxílio da bibliografia especializada, complementadas pela análise de tipos e fotos de tipos de herbários nacionais e internacionais e de espécimes depositados nos herbários EAN e JPB. Foram registradas 22 espécies: Solanum agrarium Sendtn., S. americanum Mill., S. asperum Rich., S. asterophorum Mart., S. caavurana Vell., S. capsicoides All., S. crinitum Lam., S. jabrense Agra & M.Nee, S. melissarum Bohs, S. ovum-fringillae (Dunal) Bohs, S. palinacanthum Dunal, S. paludosum Moric., S. paniculatum L., S. paraibanum Agra, S. polytrichum Moric., S. rhytidoandrum Sendtn., Solanum sp., S. stagnale Moric., S. stipulaceum Roem. & Schult., S. stramoniifolium Jacq., S. swartzianum Roem. & Schult. e S. torvum Sw. Três espécies, S. ovum-fringillae, Solanum sp. e S. swartzianum, são novas referências para a Paraíba.

A taxonomic treatment of the genus Solanum was done as part of the project "Flora da Paraíba", which aims to identify and catalogue the species of the local flora. Botanical collections, field observations and morphological studies were done for identification, description and botanical illustration of the plant species, supported by the literature and analysis of national and foreign herbaria, and specimens from EAN and JPB. Twenty two species of Solanum were recorded in State of Paraíba, as follows: Solanum agrarium Sendtn., S. americanum Mill., S. asperum Rich., S. asterophorum Mart., S. caavurana Vell., S. capsicoides All., S. crinitum Lam., S. jabrense Agra & M.Nee, S. melissarum Bohs, S. ovum-fringillae (Dunal) Bohs, S. palinacanthum Dunal, S. paludosum Moric., S. paniculatum L., S. paraibanum Agra, S. polytrichum Moric., S. rhytidoandrum Sendtn., Solanum sp., S. stagnale Moric., S. stipulaceum Roem. & Schult., S. stramoniifolium Jacq., S. swartzianum Roem. & Schult. and S. torvum Sw. Three species are new records for Paraíba: S. ovum-fringillae, Solanum sp. and S. swartzianum.