Helichrysum trilineatum leaves

The simple, stem-clasping leaves of Helichrysum trilineatum are variable, supposed to be oblong or linear, their bases sometimes wider; quite unlike what is in picture. The margins are entire, and the tips pointed, notched, or ending abruptly in a short, sharp protrusion or mucro, quite a few options for one species. The leaf tips often curve down and the lateral margins curve in slightly.

There are usually three longitudinal vein lines (sometimes grooves), visible on the lower surfaces of the leaves, more so when the indumentum is meagre or absent. The lower surfaces are sometimes white-woolly, grey from dense hairs to woolly, or green and hairless. The upper leaf surfaces may be finely covered in glands and hairless or, in stark and surprising contrast, cobwebby or greyish-white woolly. 

The leaf dimensions are from 3 mm to 25 mm long and from 1 mm to 5 mm wide (iNaturalist; JSTOR; https://keys.lucidcentral.org).