how to find full mitochondrial genome of plants in GenBank?
Is this one? http://www.ncbi.nlm.nih.gov/genome/38606?genome_assembly_id=233326

What I did was Google: "search mitochondria genome BLAST"

and clicked the first page for me "Organelle Genome Resources". I then selected 

"Browse by Organism" on the lefthand side, which took me to a new page. 

I then entered in the top left text box the phrase "Malvaceae" and up came a scroll down list from the text box of choices for the text field.

I chose the first "Malvaceae (taxid:3629)" and upon clicking that, 26 entries came up for organelles. Two of which were from Mitochondria under the "Type" column.

The other entry being: http://www.ncbi.nlm.nih.gov/genome/10704?genome_assembly_id=233221

Sorry if I  was totally off base, I am just a undergrad.