8 INTRODUCTORY. 
plant. When the leaflets themselves have a stalk (Petzolule) ne are 
petiolulate. Often the leaflets of a ain ate leaf themselves become com- 
pound, when we have a doubly or — te leaf ; this divinions may 
be continued to produce — e-pin j 
e num leaflets in a parton leaf is expressed b — 
3- peng 2 oti &e., pe palmately 3-foliolate, 5-foliolate, 
divided leaves, especially if irregularly so, are called de- 
<= point of cama of se leaf to the stem is its insertion. 
Those leaves which are inserted at o road the surface of the e ground, 
are called R Radical- or  Ralktacel thos g the a stem, cau- 
Fine and those near the flowe r, Floral- rieere or Bra 
The insertion of the leaf is in three prin neipal way: when two arise 
each node or joint, they are opposite (Fig. 34) ; when pe are 3 
whorled © 
or more at each jon, —— r verticillate (Fig. 114) ; and 
ernate, when only one is produced at are card ig. 24). Alternate 
leaves presen a great ¢ Resale in their arrangement. “When one is pro- 
duced above another xactly opposite sides of the stem, they are 2- 
aC 
others. = subject of the arrangement of leaves, or Phyl- 
Setixy, s as it is called, is one which presents much interest to the ot sods 
and w ——. found clearly ceeplninad | in Gray’s Botanical Text Boo 
28. en the bases of two o e leaves grow together, a’ eb B 
as if the stem passed through ake are it ate orfoli ae; when a 
‘single leaf presents this ——— on the union of the lobes of its base 
ee the stem, it is called 
a of opposite leaves eas rou other at right-angles are decus- 
erWhere several leaves are crowded together, _ = to spring apparently 
from the same point, they are clustered or fascicled. 
Leaves and other parts which fall soon after expanding, are fugacious 
or caducous ; deciduous, when they fall ee the close of the season ; per- 
- __ sistent, when they last the whole year or 
manner in which leaves assiiepoesiic ud is their verna- 
tion or prefoliation. When each ~— is infolded iengthie wise, it is cone 
= _ plicate, Se werent! times folded or plaited ; involute, when 
revolute, _— rolled backwards towards the 
snide eaukes cies rolled op f a one edge ; and preile when 
ial poems from — down 
‘heir offies 
