The leaf of the rockwood is shown clearly here; the oval leaf shape, notched tip and short, pinkish stalk all on display. So is the creamy translucence of the leaf midrib and parallel, slightly ascending lateral veins that appear neatly arranged until one checks the irregular spaces between them. The veins are closely yet randomly spaced, only occasionally in pairs opposite each other. Some of these veins will fork near the margin.
Older leaves or those on stressed plants tend to curl downwards along their margins, the midrib sometimes turning orange. Lower leaf surfaces are silvery white from a dense covering of short hairs.
The curious shape of the green fruit of H. argentea is variable, a rounded stubby cone here (Coates Palgrave, 2002; Bean and Johns, 2005).