6 jo Worsdell. — A Study of the Vascular System in 
Ltgnier : Recherches sur les massifs libero-ligneux de la tige des Calycanthees, etc. Bull. Soe. 
bot. de France, vol. xxxi, sdr. 2, vol. vi, 1884. 
: Recherches sur l’anatomie comparee des Calycanthees, etc. Arch. sci. du Nord de la 
France, 1886-7. 
Mirbel : Tige d’un tres vieux Calycanthus Jloridus . Ann. Sci. Nat., ser. 1, vol. xiv, 1828. 
Plitt : loc. cit. 
SOLEREDER : loc. cit. 
Van Tieghem : La structure de la tige des Calycanthacees. Ann. Sci. Nat., ser. 8, vol. xix-xx, 
1904. 
: Sur les diverges sortes de Meristeles corticales de la tige. Ann. Sci. Nat , ser. g } 
vol. i, 1905. 
Treviranus : Bot. Zeit., 1847, P* 377 - 
Vesque : loc. cit. 
Woronin : Der Ban des Stammes von Calycanthus . Bot. Zeit., i860, p. 177. 
ANONACEAE 
The vascular structure of the plants of this order shows clear relation- 
ships with that of the Magnoliaceae and Paeoniaceae. 
Artahotrys odoratissimns , R. Br. 
Stem : Three leaf-trace bundles leave the central cylinder, but not all 
simultaneously ; one of the laterals first passes out and then the other one ; 
finally the median bundle ; one of the two laterals (the first to leave the 
cylinder) is at first three parts concentric in structure and later becomes 
wholly so ; the other lateral does not become completely concentric. The 
median bundle splits into three. 
Leaf : As these bundles pass into the leaf the two laterals open out, 
become quite collateral, and fuse with the two bundles which are the 
result of splitting of the median bundle. Hence once again three bundles. 
These, in the upper part of the petiole are three parts concentric, one of 
the two laterals having hard and soft bast along part of its ventral side. 
In the lamina the three are fused together into a 3-lobed mass with 
a sclerotic sheath surrounding the whole, which is perhaps, along with the 
ventral phloem just mentioned, a reminiscence of a primitive cylinder 
of bundles possessed by the leaf ; while the concentric or sub-concentric 
bundles in the base of the petiole and stem-cortex probably represent 
a second partial attempt at reversion to the cylindric structure. 
Polyalthia sttberosa , Benth. and Hook. 
Leaf : In the upper part of the lamina is a very much flattened, 
undulated cylinder of bundles in which is a gap at each lateral angle ; the 
dorsal segments of this cylinder show a tendency to round off into individual 
concentric strands ; in the lower part, near the top of the petiole, the midrib 
cylinder splits into three parts, of which the middle bundle is quite 
