512 SIR JOHN LUBBOCK ON sTIPULES, 
obtuse or retuse, connate round the stem, with two lateral, reflexed, 
semilunar, thick foliaceous auricles convex above and concave 
beneath.” They would afford a very complete protection to the 
axillary bud. See also W. Burck, “ Beitriige z. Kenntniss der 
myrmecophilen Pflanzen,” in Annal. Jard. Buitenzorg, x. p. 75, 
where the pouch-like auricles in Fagrea imperialis, Migq., are 
described as the homes and nests of ants. 
GENTIANES. 
The Gentianex have no true stipules. In the true Gentians 
the older Jeaves are connate at the base, forming sheaths which 
protect the younger ones. 
In Menyanthes trifoliata, Linn., the petiole is described as 
sheathing. This sheath attains a length of 8 cm. or more, com- 
pletely investing the bud and sheathing the stout fleshy stem- 
The broad margins are thin and membranous, gradually narrowing 
upwards and adnate to the petiole except at the top, where there 
are two short, unequal, free auricles. Just beneath these auricles 
the membranous margins approach one another and unite in frout 
of the petiole, forming a small hood. 
The sheath of the oldest unfolded leaf protects all the younger 
members of the bud, but not its own petiole or lamina. 
BorAGINER. 
In Cordia Myzxa, Linn., the leaves have a petiole which is 
dilated at the base, protecting the small axillary buds. 
See Mez, in Engl. Bot. Jahrb. xii. p. 526, “ Morphologische u. 
anatomische Studien iiber die Gruppe der Cordiew.”’ 
BIGNONIACER. 
The Bignoniacew are, as a rule, exstipulate. 
In Bignonia Fraseri, Hort., the leaves are opposite, decussate, 
compound, petiolate, exstipulate, glabrous, persistent, with one 
pair of cordate, acuminate, dentate, stalked leaflets and a terminal 
trifurcate tendril ; the petiole is wiry, terete, dilated at the very 
base, with a slight depression on the upper side. 
The terminal bud is made up of numerous decussate leaves, the 
two largest of which cover all the younger members. At this 
stage they are shortly petiolate or sessile; the leaflets are as 
long, or slightly longer than, the terminal tendril and conduplicate, 
