VASCULAR SYSTEMS OF FLORAL ORGANS. 187 
pistil. The presence of the dorsal cords, as in Ivy, I take to be 
a positive indication of an already differentiated state of carpels, 
whether the placental cords have their tracheæ oriented inwards, 
or scattered over the phloém, or accurately centered in it. In 
this order the carpels are superposed to the petals. 
XLI. AZALEA INDICA.—A pedicel contains a complete ring, as 
in Erica (1). This sends off five branches simultaneously for 
the sepals (2), and then five for the petals (3). These divide 
into three each, which enter each petal (4, p.). Ten cords are 
then formed for the stamens, which thus show their freedom 
from the corolla, while recognizable as “ traces ” in the receptacle 
(3, 4). The remaining now form five placental cords with their 
tracheæ oriented as if axial (5); but as the dorsal carpellary 
cords are now situated behind the bases of the ovary-cells, the 
same reasoning applies in this case as in that of Erica, Ivy, &e 
In figure 6, the five placental cords have become double in 
number to supply the two rows of ovules in each ovary-cell. 
XXIII. SCROPHULARINEÆ (Pl. XXX.).—xrir. Direr- 
TALIS PURPUREA has a somewhat oval and compact cylinder in the 
pedicel (1). This sends off ten branches for the polysepalous 
calyx (2). Some of these again branch on entering the sepals (3). 
The corolla is provided with five cords (4, p.). The remaining 
ones close up and form a quadrangular prism (4, ant., anterior, 
pos., posterior side), the four corners supplying the stamens (4 and 
5, st.) ; the fifth and posterior staminal cord being altogether 
wanting (indicated by *). As soon as the four staminal cords 
are gone, the rest form two ares on the posterior and anterior 
sides (5). These now send off a large number of small cords 
which pass up the walls of the ovary-cells (6 and 7). The re- 
mainder close up and form two large placentary ares of cords (2): 
Figure 8 represents a vertical diagram. 
XLIII. PENSTEMoN.— This begins as in Digitalis (xuır.1, 2, 3). 
The fifth stamen is present, and therefore has a definite cord 
(1, st). The pistil bas only two dorsal, and four placentary 
cords (1-4). Figure 2 is a section at the base of the corolla, 
showing the position of the petaline (p.) and staminal (st.) cords. 
XXIV. LABIATE (Pl. XXX.).—xurv. LAMIUM ALBUM sup- 
plies ten cords to the sepals (1,2, 3). These rapidly multiply 
in such a way that the ten prominent ribs in the calyx-tube 
