IMBIV 05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
artículos
Título:
How many taxa can be recognized within the complex Tillandsia capillaris (Bromeliaceae, Tillandsioideae)? Analysis of the available classifications using a multivariate approach.
Autor/es:
CASTELLO L; GALETTO L
Revista:
PhytoKeys
Editorial:
Pensoft
Referencias:
Año: 2013 vol. 23 p. 25 - 39
ISSN:
1314-2011
Resumen:
Tillandsia capillaris Ruiz & Pav., which belongs to the subgenus Diaphoranthema is distributed in Ecuador,Peru, Bolivia, northern and central Argentina, and Chile, and includes forms that are difficultto circumscribe, thus considered to form a complex. The entities of this complex are predominantlysmall-sized epiphytes, adapted to xeric environments. The most widely used classification defines 5 formsfor this complex based on few morphological reproductive traits: T. capillaris Ruiz & Pav. f. capillaris, T.capillaris f. incana (Mez) L.B. Sm., T. capillaris f. cordobensis (Hieron.) L.B. Sm., T. capillaris f. hieronymi(Mez) L.B. Sm. and T. capillaris f. virescens (Ruiz & Pav.) L.B. Sm. In this study, 35 floral and vegetativecharacters were analyzed with a multivariate approach in order to assess and discuss different proposalsfor classification of the T. capillaris complex, which presents morphotypes that co-occur in central andnorthern Argentina. To accomplish this, data of quantitative and categorical morphological characters offlowers and leaves were collected from herbarium specimens and field collections and were analyzed withstatistical multivariate techniques. The results suggest that the last classification for the complex seemsmore comprehensive and three taxa were delimited: T. capillaris (=T. capillaris f. incana-hieronymi), T. virescenss. str. (=T. capillaris f. cordobensis) and T. virescens s. l. (=T. capillaris f. virescens). While T. capillaris andT. virescens s. str. co-occur, T. virescens s. l. is restricted to altitudes above 2000 m in Argentina. Characterspreviously used for taxa delimitation showed continuous variation and therefore were not useful. New diagnosticcharacters are proposed and a key is provided for delimiting these three taxa within the complex.
