Parathesis

Abstract: Parathesis costaricensis, P glendae, and P longipedicellata are described and illustrat- ed, and their phylogenetic relationships are dis- cussed. A key is provided to separate the new spe- cies. In addition, a new combination is made for Parathesis sinuata (from Colombia), and P ama- zonica Mez is lectotypified. The genus Parathesis J. D. Hooker contains 100 species distributed from northern Mexico to Pana- ma, the Caribbean, and throughout the Andes from Venezuela to Bolivia. The genus is defined by the unique glandular papillae of the calyx and corolla lobes, and bright yellow anthers. In preparation for our treatment of the genus Parathesis for Flora Me- soamericana, three new species from Costa Rica were discovered and are described herewith. A new combination from Colombia is also made, and Par- athesis amazonica is lectotypified.

Abstract: A new species of Parathesis (A. DC.) Hooker f., P. calimensis Ricketson & Pipoly (Myrsinaceae), from the Department of Valle del Cauca, Colombia, is described and illustrated. Parathesis calimensis has terminal or terminal and lateral inflorescences, dorsifixed anthers, and a fine, closely appressed tomentum on the branchlets and abaxial leaf surfaces, which places it in Parathesis subg. Parathesis sect. Cubanae Ricketson & Pipoly. It is most similar to P. pseudocrassiramea Ricketson & Pipoly from Costa Rica but is easily recognized by its terete branchlets, large leaves, and fruits.