CHAP. II. 
STIPULES. 
145 
Link regards the scales of leafbuds (called by, him teg- 
menta) as a kind of stipule, and such they, no doubt, some- 
times are, as in Liriodendron ; but then he unites with them 
the primordial ramentaceous leaves of Pinus, which have no 
analogy with stipules. 
De Candolle remarks, that no Monocotyledonous plants 
have stipules ; but they certainly exist, at least in Naiadaceae 
and Araceag. It is also said that they do not occur in the 
embryo ; but then there are some exceptions to this statement, 
as well as to Miquefs remark, that they never occur upon 
radical leaves, e. g. Strawberry. * 
Turpin considers them of two kinds. 
1. Distinct, but rudimentary, leaves, when they originate 
from the stem itself, as in Cinchonaceae, &c. 
2. Leaflets of a pinnated leaf, when they adhere to the leaf- 
stalk, as in Roses, &c. 
The ligula of grasses, at the apex of their sheathing 
petiole, a membranous appendage, which some have con- 
sidered stipulary, should rather be considered an expansion 
analogous to the corona of some Silenaceous plants. 
It has been already noted, that when stipules surround the 
stem of a plant they become an ochrea ; in this case their 
anterior and posterior margins are united by cohesion; a 
property which they possess in common with all modifications 
of leaves, and of which different instances may be pointed 
out in Magnoliaceae, where the back margins only cohere, in 
certain Cinchonaceae, in which the anterior margins of the 
stipules of opposite leaves are united, and in many other 
plants. 
L 
