Leaf samples for microscopic analysis of starch grains were collected from
the main shoot at three levels of the plant profile: the main embranchment,
fruiting, and flowering, at 7 p.m. on 6 July 2001. The samples were preserved
by the above labeled method, additionally treated with 1% osmic acid, and contrasted
with uranyl acetate and lead citrate (Venable & Coggeshal 1965).