TAXONOMIC NOTES ON ONOSMA SECT. APONOSMA FROM IRAN (BOR AGIN ACE AE)

摘要

Onosma mahabadensis Ranjbar Almasi (Boraginaceae), a new species endemic to Iran, is described. This species belongs to Onosma sect. Aponosma DC. and is confined to the western part of Iran (West Azerbaijan Province). It is closely related to Onosmasericea Willd. and is distinguished by its subpatent-bristly indumentum (vs. appressed-sericeous) with sparse short hairs (vs. dense), and bracts 14-16 mm long (vs. 6-8 mm long). A cytogenetic analysis indicates that Onosma mahabadensis is a tetraploidspecies, 2n=4x=32, consistent with the proposed base number of x = 8 for Onosma sect. Aponosma.