The opposite leaves of Silene crassifolia subsp. crassifolia are sessile or on very short petioles, decussate upon the stems and without stipules. The leaf shape is obovate to oblong-elliptic. The leaf texture is fleshy and felted or densely hairy.
The leaf folds in along its midrib and may curve down somewhat towards its tip. Leaves become up to 3 cm long. The margins are entire, sometimes maroon coloured. Leaf colour in picture varies from dull dark green to yellowish.
This plant was photographed in hot, exposed conditions a few metres from the highwater mark at Onrus (Bond and Goldblatt, 1984; iSpot).