GO 



LEAVES. 



[SECTION 7. 



15S. Perfoliate Leaves. In these the stem that bears them seems to 

 run through the blade of the leaf, more or less above its base. A coinmou 



Bellwort (Uvularia perfoliata, Fie 



162) is a familiar illustration. The 



lower and earlier leaves show it 



distinctly. Later, the plant is apt 



to produce some leaves merely 



clasping the stem by the sessile 



and heart-shaped base, and the 



latest may be merely sessile. So 



the series explains the peculiarity : 



in the formation of the leaf the 



bases, meeting amnnd the stem, grow together there. 



1.")'.). Connate-perfoliate. Such are tlie upper leaves of true Honey- 

 suckles. Here (Fig. 163) of the opposite and sessile leaves, some pairs, 

 especially the uppermost, in the course of their formation unite around the 

 stem, which thus seems to run through the disk formed by their union. 



K)0. Equitant Leaves. While ordinary leaves spread horizontally, and 

 present one face to the .sky and the. other to the earth, there are some that 

 present their tip to the sky, and their faces ri^lit and left to the horizon. 

 Among these an: the fquifniit leaves of the Iris or FIower-de-Luce. In- 

 sp.-etioii sho\vs that, eaeh leaf \\as formed as if fnhleil lop-flier lei/<///tirixf > 



Vic.. \('>'2. A summer branch of Uvulavia perfoliata; lower leaves perfoliate, upper 



foril.'dc i-l;i^i'in;,', ii|>i>tTmnst simply scssilo. 



Pitt !>'> ' r.:-:iuch of a Hoi)i'\siii'kl.-, \vitli comintc-porfoliate leaves. 



Fie,. K, |. l;,,otst.>ck rind i-ipiitant leaves of Iris. 165. A section across the 

 cluster of lynxes at the l>ulti'iii, .sliowiiiL; thu equitation. 



