124 THE FERTILISATION OF FLOWERS. [PART 111. 
protrude on being pressed down by the weight of an insect: 
serrate processes on the lower petal supply the place of ale. The 
stamens cohere, forming a tube incomplete superiorly, where a 
longitudinal split admits the insect’s proboscis to the nectaries 
Fic. 38.—Polygala Chamebueus, L. 
. 
A.—F lower, from the side, natural size. a 
B.—Ditto, front view (x 23). : 
C.—Flower, after removal of the two alar sepals. 
D —Ditto, from above. : ‘ 
E.—Ditto, from below (x 3). 
F.—The two petals of the left side, separated from the inferior petal to which they naturally 
cohere ; inner view (x 24). p3, superior petal; p?, lateral ditto, to which the filaments adhere. 
G.—Bud in section after removal of the calyx (x 54). 
H.—Full-grown flower in section (x 53). 
J.—Base of flower, from the front, after removal of the superior sepal (x 7). 8’, superior, s*, 
lateral, s3, inferior sepals; p’. inferior petal; p?, lateral ditto, completely united with p3, superior 
ditto. The anterior part of the inferior petal serves as a carina, and rotates by means of a hinge, 
a, upon the posterior part; b, cup at end of style; e, eutrance of the flower; ki, adhesive matter 
on the stigma. 
surrounding the base of the column. The flowers have the same 
want of symmetry as those of Lathyrus and Phaseolus, and are 
fertilised in the same way by Xylocopa violacea (178, 360). 
Polygala has cleistogamic flowers, according to Kuhn (399). 
