LEAVES. : 65 
Fig. 10. 
226. They are never found in Mibiviccdapadbiinns plants, 
but occur frequently in the Leguminose and Rosacew, and 
most always in the Betulinex, Salicinex, Magnoliacee, and 
the exotic genera of the Rubiacew (Cinchonacez.) : 
227. When the margins of the i 
ipules adhere so as to form a 
eafy sheath round the stem, they 
orm what is called an Ochrea, 
in the Polygoner. (See Fig. 
1.) 
228. They are generally two 
number, one on each side of 
the petiole. Their form varies, 
sometimes similar to that of the 
— ently very different. 
‘Tepes. meet Thread-like ee sada : 
a ae ees ee 
