
229 : DEVELOPMENT OF LEAVES, 
ment of the cellular tissue alone, even up to eight ; there are 
no vessels but one in the midrib. 
PI. 59. C. Aralia sciodaphylium. 
1. Bud just protruding from a nearly complete vagina. 
Lateral view. 
2. 'The next leaf ventral face. 
3. The next lateral. 
4. The next lateral. 
5. The next ventral. 
6. Ditto laterally ; one stipular production removed to 
shew the next leaf No. 7. 
4. Last leaf, i. e. with a limb and its stipular produc- 
tions; a. punctum of another leaf. 
This shews digitation to be a degree only of pinnation, with 
the foot stalks umbelled inserted. 
It shews likewise that as the terminal pinna is the earliest 
developed, so it continues the largest. 
And the stipulae very early developed are not independent 
of the petiole. 
Shews that the division into pinnule is primary, as in Bos- 
wellia or Bursera. 
Pl. 59. D. Poinciana regia. 
1. Apex of branch, with two very young leaves and 
the discal point. The larger leaf furrowed along 
the middle with rounded edges; but no promi- 
nence. 
2. Represents the same more developed ; each promi- 
nence will become a pinna, then a bipinna. 
3. Same more developed, each pinna is now undergoing 
the same change that the larger leaf of No. 1, is re- 
presented as doing. 
4. Same more developed, each has now assumed the 
form of No. 2, and each prominence will be a 
pinnule. 
Results. 
. One result of this is that the ordinary entire leaf, is the 
simplest form, particularly when combined with only one 

