THEIR FORM AND FUNCTION. 219 
silky. The stipules are small, subulate, acute, one-nerved, 
densely ciliate on the margins and keel, seated on the very base 
of the petiole. 
Shoot of Helianthemum vulgare. Slightly enlarged. 
Again, in H. tomentosum the leaves are opposite, stipulate, 
oblong, obtuse, broad at the apex, and tipped with a bristle, 
channelled along the middle, hoary and tomentose on both sur- 
faces with adpressed tufts of stellate hairs. The stipules are 
small, subulate, acute, obscurely one-nerved, hairy or silky. The 
petioles semiterete, slightly tapered to the base, silky. 
In H. ægyptiacum the leaves are ovate, obtuse, thinly hairy. 
with stellate tufts of hairs. The stipules lanceolate-subulate, 
moderately large; otherwise like H. vulgare. 
In H. rhodanthum the leaves are opposite, linear, obtuse, revo- 
lute at the margins, petiolate, stipulate, channelled above, deep 
green, and covered with stellate hairs, hoary beneath and densely 
felted with stellate hairs. Petiole tapered slightly to the base, 
semiterete. Stipules small, subulate, one-nerved, hairy, on very 
base of petiole, which widens there and shows an attempt at 
being connate at the base. 
The leaves of H. ciliare are oblong or oval, obtuse, thinly stel- 
lately hairy above and at the margin, nearly glabrous beneath. 
s2 
