Novelties in Grindelia (Asteraceae, Astereae)

Abstract

A new species of Grindelia from northeastern Argentina, G. chacoensis A. Bartoli & Tortosa
is described. This species had been previously described by Cabrera as a variety of G. puberula
Hook. & Arn. A key is provided to differenciate both species and other South American species
of the genus with capitate glandular hairs. Haplopappus prunelloides (Poepp.) DC., a species
from Argentina and Chile, is transfered to the genus Grindelia on the basis of its chromosome
morphology and achene anatomy. Chromosome number (2n=12) and morphology of Grindelia
boliviana Rusby is reported for the first time.