VASCULAR SYSTEMS OF FLORAL ORGANS. 198 
XXX. SALICACE Æ (Pl. XXXI.)—rrv. Sarıx Caprea.—tin 
the flower of the female tree, after the branch has supplied the 
bract with its cord, the adjacent cords close up and pass up the 
pedicel of the pistil (1, pi.). The conical gland (G) is entirely 
without cords, as is normally the case with nectariferous organs. 
In the male tree the cord which supplies the bract forms three 
branches (26 and 3), and at the same time throws off two 
branches, one for each stamen (2, s£.). The gland (G), as in the 
female, has none. 
Lv. POPULUS NIGRA.—In the male flower of the Poplar the 
cord which supplies the calyx (ca.) branches in a fan-like manner 
throughout it, and then sends up a cord for each of the 
stamens (st.). 
XXXI. ORCHIDACFE (Pl. XXXIL.).—rvr. OPHRYS API- 
FERA.—The pedicel contains six cords. A slight projection on one 
side indicates the site of the future labellum (1). At the base of 
the ovary it becomes more pronounced (2). A section across 
the placentas gives the form shown in (3)*. At the summit of 
the ovary the cords (still six in number) begin to show signs of 
multiplying (4). Each cord then divides into two, giving twelve 
in all (5). Fig. 6 shows how they become finally distributed, as 
follows :—The labellum (Zab.) receives two cords (st.) from the 
lateral sepaline cords (3). These presumably ought to have 
supplied two of the stamens, which are, of course, absent. On 
the lower side, the two lateral petaline (p.) supply the anterior 
sepal with two, theoretically, staminal cords (s¢.). The staminal 
cord derived from that of the labellum is entirely wanting. On 
the other side, the single anterior sepaline (8) supplies the cord 
for the single stamen which is present. 
It may be noticed that in Textbooks and Floras the ovary of 
Ophrys is sometimes described as twisted, as in Orchis. This is 
an error. The flower is merely bent over to the opposite side of 
the stem, thereby causing the labellum to take the lowermost 
position. In Orchis the ovary is twisted. This produces the 
same effect; but now the labellum stands directly over the 
bract. 
* The position of the labellum is wppermost in all the figures, except 
number 3, 
