464 The Botanical Gazette. [November, 
ceeding node, and is followed by two leaves separated by a 
shorter internode, and then by two which are almost opposite, 
and these in turn by two leaves at the same node, each sub- 
tending a bud. The pairs of the whole series decussate after 
a fashion. At the third node above occur two leaves, asa pair 
subtending a single bud. Atthe second succeeding node are 
two leaves each with a bud, and then follow six or seven buds, 
as far as the tip of the twig. 
On a fifth twig two leaves, as a pair subtending a single 
bud, are followed in the same vertical plane by two opposite 
leaves and buds, and these by a similar pair in decussating 
position. Next follow ten leaves’ in a sort of spiral phyllo- 
taxy, the alternate leaves being separated by shorter and 
shorter internodes on going higher up on the twig, so that the 
ninth and tenth leaves are again almost opposite. Then the 
phyllotaxy becomes spiral again. A branch growing from 
this twig shows at one node a bud in the axil of a leaf and a 
second bud in the axil of a stipule. 
As a series these twigs show a tendency to recurrence of 
the abnormal phyllotaxy even after a more or less successful 
return to normal conditions. The presence of two leaves (or 
rather leaf-scars) subtending a single bud, and occasionally 
of a bud also in the axil of a stipule, is especially interesting. 
Arisema triphyllum. Marion Nichols, one of the pupils 
of the High School, brought in a remarkable case of dédou- 
blement in the Indian turnip. Two leaves have developed 
on the same petiole. The petioles coalesce perfectly below, 
but show an impressed line in front and in the rear towards 
the top. The middle leaflet of each leaf is of course distinct; 
So are also the two inner leaflets of each leaf. On the con- 
trary, the two outer leaflets, which one migat expect to be 
farthest removed, have grown together along their midribs, 
but are free elsewhere. In the axil of this double. leaf is a 
double flowering stem also coalesced perfectly below but bear- 
ing an impressed line above, and bearing on each side a 
‘flower,” both spathes being well developed but placed back 
to back, the open ends therefore facing away from each other. 
ne spadix in each case bore only ovaries. It will be seen 
at once that this is a case similar to many of those mentioned 
in the case of the elms, where by dédoublement two leaves 
appeared at one node, and each leaf bore a bud in its axil, only 
in the case of the Indian turnip the dédoublement has not 
gone to the extent of perfect separation of the parts. 
