MONOCOTYLEDONS AND DICOTYLEDONS 
379 
to be pinnate or pinnately veined, and inclines to elongated 
forms. In the other case several ribs of equal prominence 
enter the blade and diverge through it (Fig. 336). Such 
a leaf is palmate or palmately veined, and inclines to broad 
forms. 
(4) Cyclic flowers pentamerous or tetramerous. The 
flowers "in fives" are greatly in the majority, but some 
FIG. 336. Leaves showing pinnate and palmate branching; the one to the left is from 
sumach, that to the right from buckeye. CALDWELL. 
very prominent families have flowers " in fours." There 
are also dicotyledonous families with flowers "in threes," 
and some with flowers "in twos." 
It should be remembered that no one of the above char- 
acters, unless it be the character of the embryo, should be 
depended upon absolutely to distinguish these two groups. 
