A new species of Boechera (Brassicaceae) from Utah and Colorado. Brittonia 55: 1–3. 2003.—A new species, Boechera glareosa, is described and a key is provided to separate it from its apparent closest relative, B. gunnisoniana (Rollins) W. A. Weber. Twelve transfers are made from Arabis to Boechera to bring the nomenclature of Rocky Mountain region taxa in line with current DNA data.

Adelia cinerea (Euphorbiaceae), formerly in Bernardia. Brittonia 55: 4–9. 2003.—The new combination Adelia cinerea (basionym: Bernardia cinerea) is made. Notes on its distribution and ecology are provided, as well as a full morphological description. A discussion on the morphological and palynological distinctions between Adelia and Bernardia, and reasons for the transfer, are presented. The placement of this species in Adelia implies a tribal change (from Bernardieae to Adelieae) within subfamily Acalyphoideae. It brings the number of Mexican species of Adelia to six.

Adelia cinerea (Euphorbiaceae), formerly in Bernardia. Brittonia 00: 000-000. 2003.—Se propone la combinación nueva Adelia cinerea (basónimo: Bernardia cinerea), proporcionándose la descripción morfológica completa del taxon, así como notas sobre la distribución y ecología. Se discuten las diferencias morfológicas y palinológicas entre Adelia y Bernardia que justifican la transferencia. La ubicación de esta especie en Adelia implica un cambio de tribu, de Bernardieae a Adelieae, en la subfamilia Acalyphoideae. El número de especies mexicanas de Adelia se eleva a seis.

The genus Dyschoriste (Acanthaceae) in Bolivia and Argentina. Brittonia 55: 10–18. 2003.—Recent field work in Bolivia has resulted in the recognition of new species of Dyschoriste (Acanthaceae). These novelties are introduced here for the convenience of other taxonomists prior to the publication of a treatment of the Acanthaceae of Bolivia. Three new Bolivian and one new Argentinean species of Dyschoriste, D. axillaris, D. boliviana, D. ceciliae, and D. prostrata are described, illustrated, and compared to their closest relatives.

Taxonomy of Begonia longifolia Blume (Begoniaceae) and related species. Brittonia 55: 19–29. 2003.—The Begonia longifolia Blume complex is revised and seven species are recognized. Begonia crassirostris Irmsch., B. inflata C. B. Clarke, B. tricornis Ridl., and B. trisulcata (A. DC.) Warb. are synonymized with Begonia longifolia Blume, making this the most widely distributed Begonia species within Asia. Begonia tetragona Irmsch. is synonymized with B. acetosella Craib. Descriptions are provided for Begonia longifolia, B. acetosella, and four closely related and also poorly known species with baccate fruit: B. cristata Warb. ex L. B. Sm. & Wassh., B. renifolia Irmsch., B. sarcocarpa Ridl., and B. turbinata Ridl. Begonia hayatae Gagnep. is also recognized as a member of this complex but is not described here. Evidence for a speciation mechanism within this group is discussed. Begonia acetosella and B. sarcocarpa are lectotypified.

New unicapitate species of Rhynchospora (Cyperaceae) from South America. Brittonia 55: 30–36. 2003.—Resolution of species delimitations in the Rhynchospora globosa complex has revealed three species new to science from South America: R. bracteovillosa, R. leucoloma, and R. melanocarpa. Each species is described and illustrated and its geographical distribution discussed.

Two new species of Araceae tribe Spathicarpeae from Bolivia. Brittonia 55:37–41. 2003.—The tribe Spathicarpeae is one of the most poorly known-tribes in the Araceae. Recently, field collections in some areas of Bolivia have revealed many interesting members of this tribe. Two new species, Gorgonidium striatum Hett., P. L. Ibisch & E. G. Gonç. and Spathantheum fallax Hett., P. L. Ibisch & E. G. Gonç. are here described, illustrated, and compared to their closest relatives.

Quercus tuitensis (Fagaceae, Quercus sect. Lobatae), a new deciduous oak from western Jalisco, Mexico. Brittonia 55: 42–48. 2003.—Quercus tuitensis, a deciduous red oak known only from the Sierra El Tuito on the Pacific slopes of western Jalisco, Mexico, is described, illustrated, and compared to Q. praineana Trel. In addition, Q. aequivenulosa and Q. coffeaecolor are reaffirmed as synonyms of Q. praineana.

Two new species of oak (Fagaceae, Quercus Sect. Lobatae) from the Sierra Madre del Sur, Mexico. Brittonia 55: 49–60. 2003.—Two new species of oak (Fagaceae) with narrowly elliptic-lanceolate leaves from the Sierra Madre del Sur of western Jalisco, Mexico, are described and illustrated. Quercus cualensis is a local endemic and Q. iltisii a more widespread species; they are closely related to Q. salicifolia Née.

Four new species of Roupala (Proteaceae). Brittonia 55: 61–68. 2003.—Four new species of Roupala are described: R. psilocarpa and R. nonscripta from Brazil, R. mexicana from Mexico, and R. filiflora from Bolivia. Their relationships within the genus are discussed.

A new species of Sicyos (Cucurbitaceae, Sicyeae, Sicyinae) from Mexico and Guatemala. Brittonia 55: 69–72. 2003.—Sicyos lirae is described as a new species from Chiapas, Mexico, and Guatemala. It grows in zones with primary or secondary montane rain forest at elevations between 1400 and 3800 meters. In Guatemala the species is commonly called “güisquil de ratón.” It is similar to Sicyos galeottii Cogn., from which it differs in blade consistency, shape of the stigma lobes, and several important ovary and fruit characters.

Ecuadorian novelties in Blakea and Topobea (Melastomataceae). Brittonia 55: 73–81. 2003.—Three new species of Melastomataceae (Blakeeae) are described: Blakea subpanduriformis, Topobea adscendens, and T. bullata. All are climbers endemic to the montane forests of the eastern slopes of the Andes in southern Ecuador. In this region, 35% of the Ecuadorian species and 41% of the endemic Ecuadorian species of Melastomataceae occur. The discovery of these three new endemic species underlines the diversity of Melastomataceae occurring on the slopes of the Andes in southeastern Ecuador.

Ecuadorian novelties in Blakea and Topobea (Melastomataceae). Brittonia 55: 73–81. 2003.—Se describen tres especies nuevas de Melastomataceae (Blakeeae): Blakea subpanduriformis, Topobea adscendens, y T. bullata. Todas son trepadoras endémicas de los bosques de montaña en las laderas orientales de los Andes en el sur de Ecuador. En esta región crece el 35% de las especies ecuatorianas de Melastomataceae y el 41% de las especies de esta familia que son endémicas de Ecuador. El descubrimiento de estas tres nuevas especies resalta la diversidad de Melastomataceae en las laderas sur-orientales de los Andes ecuatorianos.

The confusion of Agave vivipara L. and A. angustifolia Haw., two distinct taxa. Brittonia xx: 000–000. 2003.—Agave vivipara L. and A. angustifolia Haw., considered conspecific by Wijnands, are shown to be two distinct species. A previous neotypification (as a lectotypification) of A. angustifolia by Gentry is superseded because it is in conflict with the protologue; a new neotype is designated herein. The economic importance of A. angustifolia is summarized.

Carapichea guianensis: the correct name for Psychotria carapichea (Rubiaceae), with a correction on the authority of P. carapichea, and a new combination in Carapichea. Brittonia 55: 88–89. 2003.—The correct name for Psychotria carapichea is Carapichea guianensis. Also, the authority of Psychotria carapichea was previously incorrectly cited, because of an oversight of the illegitimacy of Tapogomea carapichea Poir. The complex taxonomic history of this species is analyzed, and the authority of the binomial is correctly cited. In addition, P. ligularis, which was treated as closely related to C. guianensis in previous publications, is transferred to Carapichea and it is now known as Carapichea ligularis.