THEIR FORMS AND FONCTIONS. 483: 
to the axillary bud, which receives some protection from a deep 
groove in the petiole, extending as far as the adnate portion of 
the stipule. 
Staphylea pinnata, Linn.—The winter-bud is already well deve- 
loped by the end of July, and is protected by two pairs of leaves 
reduced to the condition of scales, the outer pair of which are con- 
duplicate over the bud, slightly imbricate, and each scale covering 
about half the bud. The inner pair are unequal in size, and each 
is involute so as to cover about three-fourths of the bud indepen- 
dently of one another, except that oneis for the most part covered 
by the other. 
The leaflets of the imparipinnate leaves are involute in the 
bud, forming linear-subulate pieces, and stipellate. The stipelle- 
occupy the spaces between the pairs of leaflets. The stipules 
are lanceolate or subulate, and similar to the leaflets except that 
they are merely concave (not involute), membranous and ciliate- 
serrate at the edges, with one half of each in front of the leaf, 
while the other halves occupy the rather wide interpetiolar 
spaces. They are as long ax, or longer than, the next younger 
pair of leaves, and fold over them, thus protecting as well as filling 
those spaces over the backs of the next younger pair of leaves. 
They do not increase in size after the expansion of the leaves, 
but become brown and caducous. 
ANACARDIACEX. 
Rhus aromatica, Ait.—Leaves pinnately trifoliolate, alternate, 
or on the first two lateral shoots very frequently opposite, ex- 
stipulate. The petiole is dilated and concave at the base, enclosin g 
and protecting the axillary buds, which are developed even in 
spring and early summer. — 
The leaves are sessile or subsessile in bud, hairy, and 
protect one another. The terminal bud dies in winter, 80 that 
all the young shoots next year are developed from the axillary 
buds. . 
The concave base of the leaf is persistent, the petiole becoming 
disarticulated from it in autumn. It swells up and forms a pro- 
tection to the winter-bud, which has one or two imperfect teaves, 
but no true scale upon it. The edges of the concavity we presse 
i i ing-period, completely covering 
against the stem during the growing-period, comp ; iv 
LINN. JOURN.—BOTANY, VOL. xxx. 
