Novon is a quarterly, peer-reviewed journal and publishes short articles whose primary purpose is the establishment of nomenclature in vascular plants and bryophytes. A new orchid genus (Hemipiliopsis, Orchidaceae) is described in this issue.

CONTENTS OF NOVON 13(4)

A New Species and a Nomenclatural Change in Graptopetalum (Crassulaceae). Raúl Acevedo-Rosas and Miguel J. Cházaro

Transfer of Most North American Species of Arabis to Boechera (Brassicaceae). Ihsan A. Al-Shehbaz

A Synopsis of Tropidocarpum (Brassicaceae). Ihsan A. Al-Shehbaz

Transberingia, a New Generic Name Replacing the Illegitimate Beringia (Brassicaceae). Ihsan A. Al-Shehbaz and Steve L. O’Kane Jr.

An Overlooked New Species of Habenaria (Orchidaceae) from Central Brazil. João A. N. Batista, Luciano de Bem Bianchetti, and Eduardo G. Gonçalves

Felicia fischeri (Asteraceae) Refound in Northwest Tanzania. Henk Beentje

Nomenclatural Novelties in the Orchidaceae from Venezuela and Guyana. Germán Carnevali Fernández-Concha and Ivón M. Ramírez-Morillo

A New Species of Cipura (Iridaceae) from Colombia and Venezuela. Marcela Celis, Peter Goldblatt, and Julio Betancur

Nomenclatural Changes in Epipactis (Orchidaceae) from China. Sing Chi Chen and Guanghua Zhu

A New Species of Monardella (Lamiaceae) from Baja California, Mexico, and Southern California, United States. Mark A. Elvin and Andrew C. Sanders

Three New Species of Cordia (Boraginaceae) from the Guianas. Christian Feuillet

Chamaecrista mwangokae (Fabaceae, Caesalpinioideae), a New Species from the Southern Highlands of Tanzania. Roy E. Gereau and Gretchen M. Walters

The Genus Uvariopsis (Annonaceae) in Tropical Africa, with a Recombination and One New Species from Cameroon. David Kenfack, George Gosline, Roy E. Gereau, and George E. Schatz

Hemipiliopsis, a New Genus of Orchidaceae. Yibo Luo and Singchi (Xinqi Chen) Chen

Passiflora boenderi (Passifloraceae), a New Egg-Mimic Passionflower from Costa Rica. John M. MacDougal

A New Section of Passiflora, Subgenus Decaloba (Passifloraceae), from Central America, with Two New Species. John M. MacDougal and A. Katie Hansen

Notes on Grasses (Poaceae) for the Flora of China, II: Paniceae. Sylvia M. Phillips and Chen Shouliang

Validation of the Name Astragalus yumenensis (Fabaceae), a Species Endemic to China. Dieter Podlech, Nicholas J. Turland, and Xu Langran

A New Species of Bashania (Poaceae: Bambusoideae) from Mt. Qinling, Shaanxi, China. Ren Yi, Li Yun, and Dang Gao di

Schradera reticulata (Rubiaceae), una Nueva Especie de Costa Rica y Panamá. Joaquín Sánchez-González

Aspidistra guangxiensis (Convallariaceae), a New Species from China. Saichun Tang and Yan Liu

Nomenclatural Actions in Whytockia (Gesneriaceae). Yin-Zheng Wang

Delphinium hillcoatiae var. pilocarpum (Ranunculaceae), a New Variety from Xizang, China. Yang Qiner and Luo Yan