Flora en playas y dunas costeras de México

Background and Aims: The first updated floristic checklist, supported with herbarium specimens, is presented for beaches and coastal sand dunes of Mexico.Methods: The analysis is based on the revision of 14 national and foreign herbaria. A 2 × 2 km grid was placed over a map of the coastal sand dunes of Mexico to reference the herbarium records, corresponding to the 2180 sites and 12,419 examples of plants documented. Indices of diversity, similarity, taxonomic diversity, and redundancy were calculated.Key results: The flora of the beaches and coastal sand dunes of Mexico consists of 153 families, 897 genera, and 2075 species of vascular plants. These represent 9.5% of the vascular flora of Mexico. The herbaria with high indices of redundancy (IR≥0.7) are the herbarium of the Universidad Nacional Autónoma de México (IR=0.9), the Centro de Investigación Científica de Yucatán (CICY, IR=0.8), the Centro de Investigaciones Biológicas del Noroeste (HCIB), the Instituto de Ecología, A.C. (XAL) and the Natural Museum in San Diego (SD), each with an IR of 0.7. Five floristic regions are clearly recognized, which correspond to the seas of Mexico. The North Pacific has the highest taxonomic diversity and the South Pacific has the least. The Gulf of California, Gulf of Mexico and the Caribbean Sea have very similar taxonomic diversity. The species with the most recorded occurrences are Trianthema portulacastrum (165), Croton punctatus (107), Echites umbellatus (106) and Ipomoea pes-caprae (90). Considering the ecotonal nature of the ecosystem, most dune plants are shared with neighboring vegetation (forests, scrubs, wetlands, such as marshes or mangrove swamps).Conclusions: This first checklist of the flora of beaches and coastal dunes is the baseline for multiple future studies: floristic, biogeographic, and ecological. Moreover, this list will be important if used in environmental assessments and coastal zone plans.Antecedentes y Objetivos: Se presenta el primer listado florístico de las playas y dunas costeras de México, actualizado y respaldado por ejemplares de herbario.Métodos: Se revisaron 14 herbarios nacionales y extranjeros. Se sobrepuso una retícula de 2 × 2 km al mapa de la costa y de las dunas costeras de México para referir todos los registros que corresponden a 2180 sitios con 12,419 ejemplares de plantas. Se calcularon índices de diversidad, similitud, diversidad taxonómica y redundancia.Resultados clave: La flora registrada consta de 153 familias, 897 géneros y 2075 especies de plantas vasculares, las cuales representan 9.5% de la flora vascular de México. Las cinco colecciones con índices de redundancia altos IR≥0.7 son los herbarios de la Universidad Nacional Autónoma de México (MEXU, IR=0.9), del Centro de Investigación Científicas de Yucatán (CICY, IR=0.8), y los del Centro de Investigaciones Biológicas del Noroeste (HCIB), el Instituto de Ecología, A.C. (XAL) y el del Museo de Historia Natural de San Diego (SD), cada uno con un IR de 0.7. Se reconocen cinco regiones florísticas que corresponden a los mares de México. El Pacífico Norte tiene mayor diversidad taxonómica y el Pacífico Sur menor diversidad taxonómica. El Golfo de California, Golfo de México y Mar Caribe tienen diversidades taxonómicas similares. Las especies con más registros son Trianthema portulacastrum (165), Croton punctatus (107), Echites umbelllatus (106) e Ipomoea pes-caprae (90). Por el carácter de ecotono de las dunas costeras, la mayoría de las especies se comparten con los tipos de vegetación vecinos (selvas, matorrales, y humedales como las marismas y manglares).Conclusiones: Esta primera lista de la flora en playas y dunas de México es la base para múltiples estudios florísticos regionales y locales, biogeográficos, y ecológicos; además, que será importante para su uso en temas de impacto ambiental y manejo costero

Seven New Cacti (Cactaceae: Opuntioideae) From The Baja California Region, M\ue9xico

Volume: 62Start Page: 46End Page: 6

The Flora of Guadalupe Island, Mexico. Memoirs of the California Academy of Sciences. No. 19 by Reid Moran

Volume: 44Start Page: 113End Page: 11

Cryptantha pondii , Johnston 1928

Resurrection of Cryptantha pondii In our survey of Cryptantha maritima, we discovered two specimens that had been identified as that species but which had four, smooth nutlets, these slightly heteromorphic (Fig. 6). In discovering the publication of Johnston (1928), we realized that this was the true C. pondii. To date, we are aware of only three collections of C. pondii, including that of the type, all from Baja California Sur, Mexico. One collection has duplicates for a total of five herbarium specimens, but two collections consist of single known herbarium specimens (see below; recall that we were unable to locate the presumed “ type ” cited by Johnston, but did locate his cited “isotype,” treated here as a designated isolectotype). Two of the collections are from the extreme western portion of the Vizcaíno peninsula and one is from Natividad Island, just off the coast from that area (Fig. 7A,B). The three collections are listed here (georeferenced coordinates and elevations indicated with “*”, estimated from label data): MEXICO. Baja California Sur: Bay of San Bartolomé [Note: Bay of San Bartolomé is now called Bahia Tortuga], ca. 5 meters elevation, 27.6907˚ N, 114.8935˚ W *, March 1889, C. F. Pond 22, Isolectotype: US 41006= US 01050283; 2–3 mile E of Punta Eugenia, Vizcaíno Desert, habitat: Maritime Desert, abundant, 100–300 feet [ca. 30–90 meters] elevation, 27.82025˚ N 115.0502˚ W * (these coordinates are the centroid of three slightly varying estimates from different herbaria records), 13 March 1949, H. S. Gentry 8684, ASU 0014603!, DES 00009392, HCIB 21969!, SD 86419!, UCR-80508!; Mulegé, Isla Natividad, upper south-facing talus slope of major canyon, seventh canyon northwest of lighthouse and draining from off-shore ridge to on-shore coast, associated species: Mentzelia and Phacelia, ca. 77 meters elevation*, 27.881926˚ N, 115.194287˚ W *, 25 March 1974, R. N. Philbrick & M. R. Benedict B 74-84, SBBG 49613! We find Cryptantha pondii to be quite distinctive from other taxa in several features. It has linear bracts sporadically subtending peduncle bases of the cymules as well as flowers (Fig. 6A, C, F). The calyces are somewhat finely hirsute with ascending trichomes, described as “silky-hirsute” by Johnston (1928: 74) in addition to hispid along the midrib (Fig. 6D, F). And, we confirm the observations of Johnston (1928: 74) that the corollas are relatively large (Fig. 6C, F; described as 2–3 mm broad by him, which we confirm here) and that there are four nutlets per fruit, these smooth and shiny and heteromorphic by size, with the odd nutlet axial (closest to the inflorescence axis) slightly larger than the other three consimilar nutlets (Fig. 6B, D, E). We note that although Johnston (1928) described the nutlets of C. pondii as “smooth or very obscurely and minutely tuberculate above the middle”, we did not observe the latter sculpturing; all nutlets we observed were smooth and shiny. In addition, we were unable to observe specimens of C. bartolomaei, which Johnston believed to be synonymous with C. pondii. In fact, the type of C. bartolomaei he believed was derived from the very same collection as that of C. pondii. Online images of C. bartolomaei (holotype: NDG 40169; isotypes: GH 00096299 and GH 00096293, the last apparently a fragment from the holotype) do fit our concept of C. pondii. However, the type specimens of C. bartolomaei need to be examined and verified as equivalent to C. pondii, something we plan to do in the future. Note that C. pondii has priority of publication over C. bartolomaei .Published as part of Simpson, Michael G. & Rebman, Jon P., 2021, Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha, pp. 185-210 in Phytotaxa 509 (2) on page 196, DOI: 10.11646/phytotaxa.509.2.3, http://zenodo.org/record/542613

A New Species of Cryptantha (Boraginaceae) from the Sierra De San Pedro M\ue1rtir, Baja California, Mexico

Volume: 60Start Page: 35End Page: 4

Nota sobre los primeros registros hist\uf3ricos de dos plantas invasoras en la pen\uednsula de Baja California: cr\uf3nica del misionero jesuita Miguel del Barco

Volume: 115Start Page: 43End Page: 4

NOTEWORTHY COLLECTIONS

Volume: 43Start Page: 452End Page: 45

Calyptridium parryi Var. Martirense (Montiaceae), A New Taxon Endemic to the Sierra De San Pedro M\ue1rtir, Baja California, Mexico

Volume: 58Start Page: 258End Page: 26

FIGURE 1. Astragalus tijuanensis, A in Astragalus tijuanensis and Astragalus brauntonii var. lativexillum, a new species and a new variety in the genus Astragalus (Fabaceae) from extreme northwestern Baja California, Mexico

FIGURE 1. Astragalus tijuanensis, A) Whole plant showing leaves, inflorescences, flowers and fruits. B) Stipules. C) Bracts. D) inflorescence enlarged to see detail of the flowers. E) Calyx. F) Banner: front view (left) and side view (right). G) Wing. H) Keel. I) Stamens. J) Ovary. K) Fruit. L) Seed.Published as part of Castillón, Eduardo Estrada, Rebman, Jon P., González, Carlos & Quintanilla, José Ángel Villarreal, 2022, Astragalus tijuanensis and Astragalus brauntonii var. lativexillum, a new species and a new variety in the genus Astragalus (Fabaceae) from extreme northwestern Baja California, Mexico, pp. 1-13 in Phytotaxa 577 (1) on page 4, DOI: 10.11646/phytotaxa.577.1.1, http://zenodo.org/record/751752