What makes the Antonov An-2 have no stall speed?
The horizontal tail can't make sufficient down force to slow the plane to get the slatted wings to stalling AOA.  With the slat system, the stalling AOA will be perhaps 10 degrees higher than without.  With the AN2's large wing area, to get the slatted wings to stalling AOA might require the speed to drop to, say, 20 kt.  But the tail simply runs out of down-push before that angle is reached, in this case at 25 kt, so no stall can occur and the airplane settles into a near vertical mush as long as you hold the full up elevator.

Because there is no actual stall break or departure, the published "stall speed" is the lowest speed that airplane can be flown and maintain altitude.

Note that a "parachute descent rate" is about 20-25 fps, or 1200-1500 fpm.  That's still coming down pretty fast (you would probably collapse the gear landing normally at that descent rate) and the airplane will be wrecked when it hits the ground, but you'll live.   

The interesting thing is that if you do get a slatted wing to actually stall, the departure can be very violent.  An acquaintance who flew a Pegazair he built, which has automatic slats, was horsing it around and was able to get an aerodynamic stall by using large elevator pulsations as he was approaching minimum speed, reported that it flipped over violently and his flight bag flew from the baggage well behind him up to around the windshield.  It recovered fine however.