518 sIR JOHN LUBBOCK ON STIPULES, 
The terminal bud is protected by the stipules of the youngest 
unfolded leaf. The petiole of the latter is erect at this stage, 
and appears continuous with the axis. 
Axillary buds are protected by the sharply ascending, deeply 
grooved petioles of fully developed leaves. The first leaf of 
these buds is reduced to its stipules, which form a sheath. 
Piper longum, var. sarmentosum, ad nat.—r, rootlet from node; st, stipule 
becoming disarticulated from the petiole; sz, stipule enclosing the apical 
bud; y/, young expanded but not full-grown leaf; w/, unopened leaf in 
process of expansion. 
In P. dioscoreefolium, the leaves are narrowly cordate, 
acuminate, shortly petiolate, 5-nerved, thin, membranous, and 
persistent; petioles semiterete, deeply concave at the very base 
only. Stipules about 4 mm. long, otherwise like those of the 
last species. Those of the resting-buds are smaller, narrower, 
and wholly adnate to the petiole. 
Terminal buds are of two kinds, namely the growing and 
resting. As the leaves are evergreen, all buds are protected to 
some extent by them. The growing ones are protected by the 
more typical stipules with free points, which are deciduous. 
The resting-bud protrudes through an oval slit with membranous 
margins representing the stipules at the concave base of the 
last developed leaf. This bud is further protected by a leaf 
reduced to its stipules, with the petiole or arrested lamina repre- 
sented by an excurrent tooth at the back of the stipules. 
Axillary buds are frequent and may arise in the axil of the 
leaf or on the opposite side of the axis, and apparently from the 
