gradually towards the base ; leet Fig. ae whee a 
leaf is irregularly cut into very narrow segments. Ina ae 
leaf the lobes into which the margin is divided are narrow 
and pointed ; in a /oded leaf (Fig. 179) they 
are broader and rounder (with the excep- 
tion often of the ter-— 
minal lobe), the inci- - 
sions themselveshaving _ 
Ah an acute angle; in a 
| sénuate leaf (Fig. 180) 
> 
Fic. 175.— Runcinateleaf Fic. 176.—Lyrate leaf of fic. 177. — Heteromorphic_. 
i of the dandelion. the white mustard, Bras- leaves of the water crowtoot, 
sica alba, Ranunculus aquatilis ; the 
m floating leaves trilobed, the 
submerged leaves laciniate. 
still broader and shallower, the incisions themselves being 
also rounded off. According to the number of the divisions, ~ - 
the leaf is ¢rifid, trelobed (Vig. 179), jive-lobed, &c., or the 
latter 1s usually called palmatilobed. ; 
~ Compound leaves are classed under two principal heads, 
the digitate and the finnate. In the former, several leaflets — 
—3, 5, 7, or less often 4—spring from the apex ofthe common 
petiole. The most common number is 3, as in the clover — : 
(Fig. 182, p. 102), when the leaf is said to be ternate Oks 4 
