S Mario Sousa

Acacia: The case against moving the type to Australia

Recent studies have shown that Acacia is polyphyletic and must be split into five genera. Proposal 1584 would retypify Acacia : the type of the Australian taxon A. penninervis would be conserved over the current lectotype ( A. scorpioides ) of an African taxon. We disagree with the recommendation of the Spermatophyte Committee to endorse this proposal. Contrary to Article 14.12 of the ICBN, no detailed case against conservation was presented in Proposal 1584. We maintain that there are strong arguments against conservation, such as the large number of countries that would be affected, the economic importance of the extra-Australian species, and the economic burden placed on developing countries. Acceptance of this proposal would also violate the guidelines for conservation which clearly state that the principle of priority should prevail when conservation for one part of the world would create disadvantageous change in another part of the world.

Differencias cromosomicas entre algunas especies de los generos Sophora L. y Styphnolobium Schott

In this study chromosome numbers (2n) and karyotypes of Sophora secundiflora, S. velutina var. zimbabweensis, S. tomentosa, Styphnolobium japonicum, S. parviflorum, S. protantherum, S. burseroides, and S. conzattii were determined. The first three species presented 2n = 18, with a basic chromosome number of x = 9. These species had small variations in their karyotypes and one chromosome pair with secondary constriction. The other five species presented 2n = 28, x = 14 and their karyotypes were very similar, three pairs showing secondary constrictions. These results agree with Sousa and Rudds proposal to include species with 2n = 28 in the genus Styphnolobium

Swartzia mexicana (Fabaceae, Swartzieae), a New Species from Oaxaca, Mexico

Swartzia mexicana, a new legume species from the State of Oaxaca, Mexico, is de- scribed and illustrated. It is presently known only from the districts of Ixtlin and Tuxtepec. The new species belongs to section Swartzia, subsection Swartzia, and is assigned to series Tounateae. With- in that series, it is closely related to S. sumorum by the leaflets not prominently reticulate, the style uncinate, and the stigma truncate, as well as by the legume elliptic in shape. A key to distinguish the new species from S. sumorum and S. wurdackii is provided. RESUMEN. Se describe e ilustra Swartzia mexi- cana, una especie de leguminosas nueva para la ciencia, del estado de Oaxaca, M6xico. Hasta ahora se conoce s61o de los distritos de Ixtlin y Tuxtepec. La especie nueva corresponde a la sect. Swartzia, subsect. Swartzia y se incluye en la serie Touna- teae. Dentro de esa serie, se relaciona estrecha- mente con S. sumorum por los foliolos sin nervaci6n reticulada prominente, el estilo uncinado y el es- tigma truncado, asi como por la legumbre de forma eliptica. Se presenta una clave para distinguir a la especie nueva de S. sumorum y de S. wurdackii.

Itinerario botanico de G. Andrieux en México

Summary The great importance of G. Andrieuxs botanical collections, not so much by their number, but by the period and area they cover, is discussed. The numerical sequence of the collections is explained and the itinerary shown and illustrated by a map. An index to localities is included with original notes from the label data providing exact geographical location.

Haematoxylum calakmulense (Leguminosae, Caesalpinoideae), una Nueva Especie Mesoamericana

Resumen.  Se describe e ilustra una nueva especie mesoamericana de la Península de Yucatán, Haematoxylum calakmulense Cruz Durán & M. Sousa (Leguminosae, Caesalpinoideae). Esta nueva entidad es similar a H. campechianum L., sin embargo difiere de esta por presentar un mayor número de folíolos, hasta seis pares, de menor tamaño, de consistencia crasa y venación secundaria poco evidente; el raquis y el pecíolo presentan pelos uncinados blancos, y los folíolos tienen pelos blancos cerca de la base por el envés; las inflorescencias son más cortas, no más de 4.5 cm, el raquis de la inflorescencia, pedicelos y cáliz son siempre pilosos, y los pétalos son de menor tamaño. Se incluye también una clave para distinguir las especies conocidas del género Haematoxylum L. Abstract.  Haematoxylum calakmulense Cruz Durán & M. Sousa (Leguminosae, Caesalpinoideae), a new Mesoamerican species from the Yucatan Peninsula, is described and illustrated. This new species is similar to H. campechianum L., but differs by having more leaflets, up to six pairs, that are smaller and thick, with secondary venation non-evident; the rachis and petiole always with uncinate white trichomes, while the leaflets present with white trichomes on the abaxial surface toward the base; the inflorescences are shorter, no more than 4.5 cm, the inflorescence rachis, pedicels, and calyx are always pilose and the petals are smaller. A dichotomous key to distinguish the known species of Haematoxylum L. is included.

Revisión del complejo de Lonchocarpus cruentus (Leguminosae: Papilionoideae: Millettieae), con descripciónes de cinco especies nuevas

Abstract.The Lonchocarpus cruentus complex, within sect. Lonchocarpus, is described. This complex is characterized by the presence of a keeled vexillary margin on the pod. Five of the six species described and illustrated are new to science: Lonchocarpus aequatorialis, L. alternifoliolatus, L. guianensis, L. septentrionalis and L. trinitensis. A pronounced flower size difference in the north-south distribution of this complex is shown.ResumenSe describe el complejo de Lonchocarpus cruentus, dentro de la sect. Lonchocarpus. Dicho complejo se caracteriza por la presencia del margen vexilar aquillado en la legumbre. Se describen e ilustran a seis especies, de las cuales cinco son nuevas para la ciencia: Lonchocarpus aequatorialis, L. alternifoliolatus, L. guianensis, L. septentrionalis y L. trinitensis. En este complejo se presenta una marcada alternancia en el tamaño de las flores en su distribución de norte a sur.

Cuatro especies nuevas de Indigofera (Leguminosae, Papilionoideae) para la Flora de México

ResumenSe describen e ilustran cuatro nuevas especies de Indigofera (Leguminosae, Papilionoideae) para la flora de México: Indigofera floresii, I. hirsutissima, I. magallanesii e I. sinaloensis. Entre estas nuevas propuestas, destaca I. sinaloensis, como la segunda especie de la serie Platycarpae. Con la inclusión de estas nuevas entidades, se estima que existen alrededor de 31 especies silvestres para el género en México.AbstractFour new species of Indigofera (Leguminosae, Papilionoideae) for the flora of Mexico are described and illustrated: Indigofera floresii, I. hirsutissima, I. magallanesii and I. sinaloensis. Among the new species, I. sinaloensis, is the second species of the series Platycarpae. Including these four new species, we estimate the existence in Mexico of about 31 wild species of the genus.

Eysenhardtia byei (Leguminosae, Papilionoideae), una Especie Nueva del Noroeste de México

Abstract.  Eysenhardtia byei Cruz Durán & M. Sousa, a new species from the northwest of Mexico, is described and illustrated. This new taxon is similar to E. orthocarpa (A. Gray) S. Watson var. orthocarpa and E. polystachya (Ortega) Sarg., but differs in the leaflets having revolute margins and oblique to subcordate bases (vs. flat and obtuse to semicordate), the stipels being shorter than the petiolules (vs. equal or longer), and the petals being less than twice the length of the calyx (vs. double or more), and its restricted distribution in the zone of barrancas or canyons in the states of Chihuahua and Sonora (vs. an expanded distribution). Resumen.  Se describe e ilustra Eysenhardtia byei Cruz Durán & M. Sousa, una especie nueva restringida a la parte noroeste de México. Este nuevo taxón es similar a E. orthocarpa (A. Gray) S. Watson var. orthocarpa y a E. polystachya (Ortega) Sarg., sin embargo, difiere de estas en que presenta folíolos con márgenes siempre revolutos y bases claramente oblicuas a subcordadas (vs. bases obtusas a ligeramente cordadas), las estipelas más cortas que los peciólulos, los pétalos no son el doble o más de la longitud del cáliz (vs. el doble o más), y por su distribución en los estados de Chihuahua y Sonora, en zona de barrancas (vs. amplia distribución).

BALBOA (FABACEAE: MILLETTIEAE) REDUCED TO CRACCA (ROBINIEAE)

Balboa diversifolia Liebm., known only from the type collection and hitherto of controversial affinity, is here referred to the genusCracca Benth. As the epithetdiversifolia is preoccupied inCracca, the new nameCracca pacifica is proposed. This species is morphologically most similar to the widespreadCracca caribaea.