The Annals of the Missouri Botanical Garden, published quarterly since 1914, contains peer-reviewed papers primarily devoted to systematic botany and evolutionary biology. The Annals reflect the global mission of the Garden, with contributing authors from the Americas, Africa, Europe, Asia, and Australasia.

CONTENTS OF THE ANNALS OF THE MISSOURI BOTANICAL GARDEN, VOL. 103, NUMBER 2

Revisión Taxonómica de las Especies del Género Sudamericano Tristagma (Amaryllidaceae, Allioideae)
Agostina B. Sassone & Silvia C. Arroyo-Leuenberger

Evolution and Reciprocal Origins in Mediterranean Ferns: The Asplenium obovatum and A. adiantum-nigrum Complexes
Emily B. Sessa, María Vicent, Sally M. Chambers & José M. Gabriel y Galán

A Classification of the Fern Genus Tectaria (Tectariaceae: Polypodiales) Based on Molecular and Morphological Evidence
Liang Zhang & Li-Bing Zhang

A Revision of the Mexican Species of Lithospermum (Boraginaceae)
James I. Cohen

A Taxonomic Revision of Passiflora sect. Xerogona (Passifloraceae) Using Principal Component Analysis
Tatiana Erika Boza Espinoza, Peter M. Jørgensen & John M. MacDougal

• Editor-in-Chief: Li-Bing Zhang