just use the code from one of the other views
we don't put it there because normally there isn't enough room
use this snippet
<?php // Product Short Description
if(!empty($product->product_s_desc) and $params->get('category_list_shortdesc',1)) { ?>
<p class="product_s_desc"> <?php echo shopFunctionsF::limitStringByWord($product->product_s_desc, 100, '...') ?> </p>
<?php } ?>
somewhere around line 712 on templates/flexible_darkmart/html/com_virtuemart/category/default.php
and it will appear under the image
Cheers