VARIACIÓN MORFOANATÓMICA EN UNA POBLACIÓN DESENECIO FILAGINOIDES (ASTERACEAE)

Abstract

Morphoanatomical variation in a Senecio
filaginoides (Asteraceae) population. S.
filaginoides DC "charcao, mata mora", is a
white-tomentose shrub widely distributed
in arid region of Argentine, characteristic
of Patagonia province. It has two varieties,
S. filaginoides var. filaginoides y S.
filaginoides var. lobulatus (Hook. et Arn.)
Cabrera. Morphoanatomical characters and
essential oil secretory structures were
studied in year seasons. The length of
grown up leaf is significatively larger in
filaginoides variety for all the seasons. The
proportion of area occupied by secretory
structures is bigger in the foliar sheet
than in the stem for the two varieties. It is
bigger in winter for both organs.
Schizogenous ducts are larger in number
and diameter in the stem of lobulatus
variety. Secretory cell’s number is larger,
too. The indumentum density decreases
with leaf maturity and pilosity reduces by
lost of no glandular trichomes apical cell.