Tigridia

Abstract: La tribu Tigridieae (Iridoideae: Iridaceae) es un grupo americano y monoletico. Sus centros de diversificacion se localizan en Mexico y la parte andina de Sudamerica. El objetivo del presente trabajo fue analizar la riqueza y distribucion de Tigridieae en Norteamerica. Para ello, se utilizo una base de datos con 2,769 registros georreferenciados. Mediante sistemas de informacion geografica (SIG) se analizo la riqueza de Tigridieae por division politica, ecorregion y una cuadricula de 45×45 km. Tigridieae esta representada por 66 especies y 7 subespecies. De estas, 54 especies y 7 subespecies son endemicas. Tigridia es el genero mas diverso con 43 especies y 6 subespecies. La riqueza de taxa se concentra en Mexico en los estados de Oaxaca, Mexico y Jalisco. El analisis por ecorregiones muestra al bosque de pino-encino de la Faja Volcanica Transmexicana como la mas diversa con 36 taxa. Por ultimo, la celda mas diversa contiene 14 taxa y se localiza en donde convergen el bosque de pino-encino de la Faja Volcanica Transmexicana, el bosque tropical caducifolio del Bajio y el bosque tropical caducifolio de la cuenca del rio Balsas. Derechos Reservados © 2015 Universidad Nacional Autonoma de Mexico, Instituto de Biologia. Este es un articulo de acceso abierto distribuido bajo los terminos de la Licencia Creative Commons CC BY-NC-ND 4.0

Abstract: The present status of the floristic-ecological knowledge of wild Mexican Iridaceae is defined. 16 genera and 98 species of Iridaceae, all of them belonging in the 4 tribes of the subfamily Iridoideae are registered from the country. The tribe Tigridieae has its principal center of radiation in Mexico, where 11 of 18 genera and 52 of approximately 130 species grow; of those, 3 genera (30 %) and 38 species (71.7 %) are endemic. One naturalized species is also known. The best represented genera of Iridaceae in Mexico are Sisyrinchium (40 spp.) and Tigridia (29 spp.). Endemism in the family at species level reaches 54.6 %. Data and comments on habitat, distribution and phytogeography of Mexican Iridaceae are included.

Abstract: Abstract Amentoflavone has been characterised from leaves of Patersonia glabrata. This is the first report of a biflavone in the Monocotyledoneae. The quinone plumbagin, a characteristic constituent of three dicotyledonous families, is now found to be a useful marker for the genus Aristea; it also occurs in two Sisyrinchium species and in Sparaxis tricolor. Mangiferin, a C-glucosylxan-thone known previously in the Iridaceae only from Crocus, Iris and Gynandriris has now been found in Eleutherine, Rigidella, Gelasine and Tigridia. results is discussed.

Abstract: A new genus is proposed for plants heretofore included in Nemastylis latifolia Weatherby. Sessilanthera is related to Tigridia, Rigidella, and Fosteria in tribe Tigrideae.