Morphology, geography, and ecology of incised-leaf variants of Symphyotrichum lowrieanum (Asteraceae)
DOI:
https://doi.org/10.17348/jbrit.v19.i1.1387Palabras clave:
cluster analysis, leaf development, lobed leaves, Ridge and Valley, teratologyResumen
Desde mediados del siglo XIX se han observado especímenes identificados como Symphyotrichum cordifolium y S. lowrieanum con hojas incisas y pinnatifidas. Una búsqueda en los registros de herbario descubrió 31 colecciones únicas y 53 pliegos de herbario de plantas cuyas incisiones y lóbulos foliares oscilaban entre 4 y 18 mm de longitud. En la mayoría de los especímenes, al menos la mitad de las hojas caulinares presentaban incisiones. Las hojas basales tendían a ser cordiformes, truncadas o redondeadas en la base y los rizomas largos se asociaban a menudo con la forma de hoja incisa. Los especímenes con hojas incisas se encontraban en ocho estados, desde Maine hasta Tennessee, con concentraciones en Pensilvania y Tennessee. La mayoría de los lugares de recolección estaban asociados con esquisto o piedra caliza/dolomita en las provincias fisiográficas de Ridge and Valley y las mesetas de los Apalaches a elevaciones de 200–800 m. Las recolecciones repetidas de especímenes con hojas incisas de varias poblaciones mostraron la persistencia espacial y temporal del fenotipo variante. Aunque las variantes constituían la forma mayoritaria en algunas poblaciones, normalmente también estaba presente el S. lowrieanum típico. Pruebas circunstanciales sugieren que el fenotipo de hoja incisa tiene una base genética. Las asociaciones geográficas, ecológicas y temporales se reconocen mejor mediante el uso del rango de variedad como; Symphyotrichum lowrieanum (L.) G.L. Nesom var. incisum (Porter ex Britton) F. Levy, comb. nov.
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