176 VARIETIES. OF PINNATE LEAVES. 
paired ; and multijugate or many-paired ( fig. 357). Several 
kinds of pinnate leaves have also been distinguished by special 
names. Thus, when a pinnate leaf ends in a solitary leaflet 
(jig. 357), as in the Rose and Elder, it is imparipinnate or wn- 
ee equally-pinnate, or pinnate with an 
a odd leaflet ; it is equally or abruptly 
Y pinnate, or paripinmnate, when it ends 
Nf in a pair of leaflets or pinne (fig. 
ie 358), as in some species of Cassia, 
the Mastich plant (Pistacia Lentiscus), 
Logwood (Hematoxylon campechia- 
num), and Orobus tuberosus ; and it 
is interruptedly pinnate (fig. 359) 
when the leaflets are of different sizes, 
so that small pinne are regularly or 
irregularly intermixed with larger 
ones, as in the Potato (Solanum 
tuberosum) and Silver Weed (Poten- 
tilla anserina). Or, when the terminal 
leaflet of a pinnate leaf is the largest, 
and the rest gradually smaller as they 
approach the base (fig. 360), it is 
lyrately pinnate, as in the common 
Turnip. This leaf and the true lyrate 
Fig. 363. A decom pound leaf. (page 167 and fig. 328) = frequently 
confounded together by botanists, 
and the two kinds often run into one another, so that it is 
by no means uncommon to find both varieties of leaf on the 
same plant, as in the common Turnip and Yellow Rocket. 
When the leaflets of a pinnate leaf become themselves 
pinnate, or, in other words, when the partial petioles which 
are arranged on the common petiole exhibit the characters of 
an ordinary pinnate leaf, it is said to be bipumnate (fig. 361) ; 
the leaflets borne by the partial or secondary petioles are then 
commonly termed pinnules. When the pinnules of a bipinnate ~ 
leaf become themselves pinnate, it is tripimnate (fig. 362), as 
in the Meadow Rue (Thalictrwm minus), and the common 
Parsley ; it commonly happens, however, that in these leaves 
the upper leaflets are less divided, asin fig. 362. If the division 
extends beyond this, the leaf is decompownd (fig. 363), as in 
many Umbelliferous plants. 
2. Palmately-veined Compound Leaves.—Such a leaf is formed 
when the ribs of a palmately-veined leaf bear separate leaflets ; 
and hence these leaves are readily distinguished from those of 
the pinnate kind by their leaflets coming off from the same 
point, instead of, as in them, along the sides of a common 
petiole. We distinguish several kinds of such leaves ; thus, a 
leaf is said to be binate, bifoliate, or wiijugate, if it consists of 
only two leatlets springing from a common point (fig. 364), as 
