In article , Monique Reed
writes
Your first two show the androecium and gynoecium (male and female
parts of the flower) in two stages of maturity. The second two show
the gynoecium in two further stages of maturity.

To elaborate, in this particular case the fused filaments of the anthers
are described as a staminal column. (I've also seen stamineal column,
but I think that that's archaic.)
--
Stewart Robert Hinsley
http://www.malvaceae.info