Volume 86 AnnalsNumber 4 of the1999 Missouri Botanical GardenREVISION OF BERBERIS Leslie R. Landrum2(BERBERIDACEAE) IN CHILEAND ADJACENT SOUTHERNARGENTINA'ABSTRACT Twenty species of Berberis are recognized in continental Chile, the Juan Fernindez Islands, and adjacentsouthern Argentina, comprising a considerable reduction in species number from the works of earlier authors.Hybridization between species is common. Each species is described, and ail are distinguished with a dichotomouskey. Maps are provided for ail species and photographs for ail continental species. Notes on phenology, habitat,distribution, and distinguishing characters are included. One new combination, B. chilensis var. brachybotria(Gay) Landrum, is made. The following taxa are lectotypified: B. brachyacantha Phil. ex Reiche, B. buxifolia var.antarctica C. K. Schneid., B. congestiflora Gay, B. crispa Gay, B. ferox Gay, B. brachybotria Gay, B. empetrifoliavar. magellanica C. K. Schneid., B.florida Phil., B. horrida Gay, B. linearifolia Phil., B. montana var. chillanensisC. K. Schneid., B. mutabilis Phil., B. polymorpha Phil., B. variiflora C. K. Schneid., B. wawrana C. K. Schneid.,and B. zahlbruckneriana C. K. Schneid. This paper is a more complete version of my many things, namely nomenclatural citations andtreatment of Berberis for the Flora de Chile project synonymy, lists of representative specimens, illus-being coordinated by the Universidad de Concep-trations, an index to collectors, and numbers andci6n, Concepci6n, Chile. For the sake of brevity, discussion of systematic criteria and geography, This study was made possible in part by funding from the National Geographic Society. While in Chile I waskindly supported by the Departamento de Botinica of the Universidad dle Concepci6n (and through that institutionby the Andrew Mellon Foundation and National Science Foundation), and the Secci6n BotAnica of the MuseoNacional de Historia Natural in Santiago. I especially thank Clodomiro Marticorena, Roberto Rodrfguez, EduardoRuiz, Max Quezada, and M�lica Mufioz for their help with field studies and in the preparation of this manuscript.The Corporaci�n Nacional Forestal (CONAF) provided a collecting permit and logistic support. CONAF employeesG. Guti�rrez, A. Morales, and J. Flores were especially helpful in relocating Berberis species near Paposo. I thankmy wife, Sonia, for her cheerful companionship and help in the field. Generous relatives have provided us withlodging. We thank the families of Barbara Cubillos and Esmeralda Cubillos of Santiago, Alejandro Suanes ofConcepci6n, Armando Carrasco of Valdivia, and Ricardo Suanes in Paris, France. for their kind hospitality.Charlotte Taylor, Jorge S. Marroquf, and Clodomiro Marticorena reviewed and Victoria C. Hollowell edited thismanuscript. They have ail kindly offered many helpful suggestions. The following herbaria were consulted forthis study and the curators are thanked: ASU, BM, BR, CAS, CONC, CORD, F, G, HIP, LP, LY, MERL, MO, NA,NY, OS, P, RSA, SGO, SI, TEX, US, and W. 2 Department of Plant Biology, Arizona State University, Tempe, Arizona 85287-1601, U.S.A. ANN. MISSOURI BOT. GARD. 86: 793-834. 1999.