Novon is a botanical journal whose purpose is to publish articles establishing new nomenclature, including new taxa and new names, for vascular plants and bryophytes.

CONTENTS OF NOVON, VOL. 31

Two New Species of the African Genus Discoclaoxylon (Claoxylinae: Euphorbiaceae) from Central Africa
Patricia Barberá, Olivier Lachenaud, and Alejandro Quintanar

More New Species of Psychotria from Madagascar (Rubiaceae, Psychotrieae)
Charlotte M. Taylor, Heidi H. Schmidt, and Roy E. Gereau

A New Combination for a Narrowly Endemic Polemonium (Polemoniaceae)
Jeffrey P. Rose and Kenneth J. Sytsma

Rubiacearum Americanarum Magna Hama Pars L: New Species, Combinations, and Notes for Some South American Genera of Dialypetalantheae (Former Condamineeae)
Charlotte M. Taylor and Carla Maldonado

Clematicissus pruinata, a New Combination in Vitaceae
Adela María Panizza and Christian Alejandro Zanotti

Taxonomic Studies on Malagasy Dalbergia (Fabaceae). IV. A New Species from Central and Southern Madagascar and a Narrowed Circumscription for D. emirnensis
Nivohenintsoa Rakotonirina, Peter B. Phillipson, Simon Crameri, Nicholas Wilding, Porter P. Lowry II, Bakolimalala Rakouth, and Richardson Razakamalala

A New Species of Matelea (Apocynaceae, Asclepiadoideae) from the Península de Nicoya, Guanacaste, Costa Rica
José Esteban Jiménez, Miguel Méndez, and Alexis Obregón-Carrillo

Salimenaea and Troncosoa (Verbenaceae, Lantaneae), Two New Monotypic Genera from Southern South America
Nataly O’Leary, Pablo Moroni, Patricia Lu-Irving, Fabiana Mirra, and Richard G. Olmstead

A New Species of Werauhia (Bromeliaceae: Tillandsioideae) from Montane Cloud Forests of Costa Rica
Alfredo Cascante-Marin and J. Francisco Morales

A New Species of Zanthoxylum (Rutaceae) from Colombia and Brazil
Carlos Reynel R. and Yeison Londoño-Echeverri

New Boraginales from Tropical America 10: New Species of Cordia from Colombia, Ecuador, and Peru
James S. Miller, Colin Robinson, and Victoria Patrick

New Boraginales from Tropical America 11: A New Species of Cordia (Boraginales: Cordiaceae) from Colombia and Venezuela
James S. Miller

A New Species of Matelea (Apocynaceae, Gonolobinae) from Bolivia and an Assessment of Matelea in Bolivia
Gilberto Morillo, Ulrich Meve, and Sigrid Liede-Schumann

Four New Species of Philodendron subg. Philodendron (Araceae) from Caquetá Department, Colombia
Thomas B. Croat, Thomas E. Mines, and Edwin Trujillo Trujillo

Typifications and Nomenclatural Notes on Old World Names in Boehmeria (Urticaceae)
K. K. Jeomol and P. Sunojkumar

A New Varietal Combination for a Narrowly Endemic Rock Daisy (Laphamia: Asteraceae) in Southern New Mexico
Zachary S. Rogers and Richard W. Spellenberg

Taxonomic Studies of Diospyros (Ebenaceae) from the Malagasy Region. IX. Clarification of Species Limits Between D. clusiifolia and D. fuscovelutina, and Establishment of a New Combination Based on a Name Previously Placed in Synonymy, Tetraclis baronii
Hasina N. Rakouth, Richard Randrianaivo, Sandratra A. F. Andrianarivelo, Dochard A. Karatra, Minosoa Z. Nombajanahary, Stephano Andriamiadana, Roger L. Andriamiarisoa, Roger Bernard, Richardson Razakamalala, Sylvie Andriambololonera, Bakolimalala Rakouth, and Porter P. Lowry II

Five New Combinations in Passiflora sect. Dysosmia (Passifloraceae)
Harlan T. Svoboda

A New Polygonatum, P. bifolium species (Asparagaceae: Nolinoideae: Polygonateae) from Myanmar and a Checklist of the Species Known to Occur There
Aaron Floden, Thet Yu New, and Kate E. Armstrong

New Combinations and Lectotypifications in Rubiaceae for the Flora of Tropical East Africa
Roy E. Gereau, W. R. Quentin Luke, Henk J. Beentje, and Maria Alvarez

Chlorophytum vespertinum (Asparagaceae, Anthericeae), a New Species from Zambia and Tanzania
Roy E. Gereau, Shakkie Kativu, Pierre Meerts, Lari Merrett, Jo Osborne, and Kaj Vollesen

Elevation of Three Varieties of the Malagasy Endemic Casearia nigrescens (Salicaceae) to the Species Level
Angelina X. Wang, Laurel Philpott, and Wendy L. Applequist

Two New Species of Persea (Lauraceae) from Ecuador
Jens G. Rohwer and Henk van der Werff

Five New Species of Aniba (Lauraceae) from Colombia, Ecuador, and Peru
Henk van der Werff

New Species, Combinations, and Typifications in Neotropical Malpighiaceae
Amy Pool

A New Species and a New Synonym in Senecio (Compositae) from Madagascar
Joel Calvo, Heidi H. Schmidt, and Martin W. Callmander

Piper alwynii (Piperaceae), a New Species from the Cordillera del Cóndor at the Border of Peru and Ecuador
M. Alejandra Jaramillo

Lectotypification of Anthemis aetnensis (Asteraceae)
Gianmarco Tavilla, Salvatore Brullo, Pietro Minissale, Salvatore Cambria, and Alexander N. Sennikov

New Combinations and New Names in Desmopsis (Annonaceae)
George E. Schatz, Andrés Ernesto Ortiz-Rodriguez, María Fernanda Martínez-Velarde, and Thomas L. P. Couvreur