Chromosome numbers in South American Andean species of <i>Lupinus</i> (Leguminosae)

Abstract

Chromosome numbers were determined in 22 accessions of 16 Lupinus L. species from the Andean region. All had 2n=48 chromosomes, except L. bandelierae C. P. Smith (2n=36). These are the first chromosome countings for L. arvensis Benth., L. chilensis C. P. Smith, L. chlorolepsis C. P. Smith, L. chrysanthusUlbr., L. lindleyanus Agardh, L. mantaroensis C. P. Smith, L. piurensis C. P. Smith, L. proculaustrinus C. P. Smith, L. prostratus Agardh, L. pulvinaris Ulbr., L. pycnostachys C. P. Smith, L. smithianus Kunth and L. tominensis Wedd. The present study also confirmed literature data on chromosome numbers of L. mutabilis Sweet, L. semperflorens Benth. (2n=48) and L. bandelierae (2n=36). The results clearly confirm that, cytologically, the vast majority of Andean species are closer to the North American than to the eastern South American taxa. Se cita a Schizachyrium hatschbachii Peichoto por primera vez para la flora argentina. Se incluyen algunas observaciones ecológicas y una clave para diferenciarla de las entidades afines.